WFH 2018

Photo from Shire

GLASGOW—Recombinant von Willebrand factor (rVWF) alone can be sufficient as perioperative management for some patients with severe von Willebrand disease (VWD), according to researchers.

In a phase 3 study, 10 of 15 patients were able to achieve hemostatic efficacy ratings of “good” or “excellent” when receiving only rVWF before, during, and/or after surgery.

The remaining 5 patients also achieved favorable hemostatic efficacy ratings, but they received recombinant factor VIII (FVIII) as well.

These results were presented at the World Federation of Hemophilia (WFH) 2018 World Congress (abstract W-MP-63 [749]). The research was sponsored by Shire, the company marketing rVWF as Vonvendi.

“There is an unmet clinical need for those living with von Willebrand disease, as they face a heightened risk of bleeding during surgery,” said study investigator Flora Peyvandi, MD, PhD, of the University of Milan in Italy.

“People with von Willebrand disease lack proper function or quantity of von Willebrand factor, and some also have a secondary factor VIII deficiency. In this study, recombinant von Willebrand factor was administered to replace the insufficient or dysfunctional von Willebrand factor, allowing the body to naturally replenish FVIII in most patients. These study results demonstrate clinical promise as physicians were able to tailor treatment based on each patient’s individual need for one or both factor therapies.”

The study included 15 adults with severe VWD who were undergoing elective surgical procedures. Ten patients were undergoing major surgery, 4 minor, and 1 oral surgery.

The patients’ median age was 40 (range, 20-70), and 8 were female. Most (n=8) had type 3 VWD, 3 had type 1, 2 had type 2A, 1 had 2B, and 1 had 2M.

At baseline, the mean endogenous FVIII level (FVIII:C) was 16.4 IU/dL, and the mean VWF ristocetin cofactor (VWF:Rco) was 10.6 IU/dL.

The patients received rVWF at 40 to 60 IU/kg VWF:RCo intravenously 12 to 24 hours before surgery to allow FVIII:C levels to increase to at least 30 IU/dL for minor or oral surgery or to at least 60 IU/dL for major surgery, within 3 hours before surgery.

If the desired levels were achieved, rVWF could be given alone. If the levels were not achieved, patients would receive rFVIII as well, within 1 to 2 hours before surgery. Patients were monitored for 14 days after surgery.

Results

All 15 patients had overall/intraoperative hemostatic efficacy ratings of “excellent” (as good as or better than expected) or “good” (probably as good as expected).

The patients received a median of 6 (range, 2 to 15) rVWF infusions at a median dose of 55 IU/kg (range, 36.1 to 59.9). Most patients (n=11) did not receive rVWF every day. For some, infusions were separated by 2 to 9 days.

Ten patients received rVWF alone, 12 did not receive any preoperative FVIII, and 2 did not receive rVWF postoperatively.

Most rVWF infusions (89.4%, 93/104) were given alone, and 70% (7/10) of the major surgeries were performed with rVWF alone.

The researchers said that, with rVWF alone, patients had hemostatically effective levels of FVIII:C as early as 6 hours after surgery, and this was sustained for 72 to 96 hours.

There were 5 patients who received rVWF with rFVIII. Of the 11 infusions these patients received, 9 were given when FVIII:C levels were above 60 IU/dL.

Three patients received rVWF with rFVIII 1 hour before major surgery—total hip replacement, molar extraction, and left ankle prosthesis. However, 2 of these patients had FVIII:C levels above 60 IU/dL.

The patient undergoing a molar extraction received rVWF with rFVIII 6 times after surgery. In 5 cases, the patient’s FVIII:C levels were 110 to 152 IU/dL. In the remaining case, the FVIII:C level was 23 IU/dL.

Two patients received rVWF with rFVIII for minor surgery. One patient undergoing a tooth extraction received rVWF with rFVIII intraoperatively when the FVIII:C level was 72 IU/dL.

The other patient received rVWF with rFVIII after radioisotope synovectomy when the FVIII:C level was 73 IU/dL. This patient received a postoperative dose of rVWF alone as well.

One patient tested positive for binding antibodies to VWF, and 1 patient developed deep vein thrombosis 3 days after total hip replacement while receiving rVWF.

Photo from Shire

GLASGOW—Recombinant von Willebrand factor (rVWF) alone can be sufficient as perioperative management for some patients with severe von Willebrand disease (VWD), according to researchers.

In a phase 3 study, 10 of 15 patients were able to achieve hemostatic efficacy ratings of “good” or “excellent” when receiving only rVWF before, during, and/or after surgery.

The remaining 5 patients also achieved favorable hemostatic efficacy ratings, but they received recombinant factor VIII (FVIII) as well.

These results were presented at the World Federation of Hemophilia (WFH) 2018 World Congress (abstract W-MP-63 [749]). The research was sponsored by Shire, the company marketing rVWF as Vonvendi.

“There is an unmet clinical need for those living with von Willebrand disease, as they face a heightened risk of bleeding during surgery,” said study investigator Flora Peyvandi, MD, PhD, of the University of Milan in Italy.

“People with von Willebrand disease lack proper function or quantity of von Willebrand factor, and some also have a secondary factor VIII deficiency. In this study, recombinant von Willebrand factor was administered to replace the insufficient or dysfunctional von Willebrand factor, allowing the body to naturally replenish FVIII in most patients. These study results demonstrate clinical promise as physicians were able to tailor treatment based on each patient’s individual need for one or both factor therapies.”

The study included 15 adults with severe VWD who were undergoing elective surgical procedures. Ten patients were undergoing major surgery, 4 minor, and 1 oral surgery.

The patients’ median age was 40 (range, 20-70), and 8 were female. Most (n=8) had type 3 VWD, 3 had type 1, 2 had type 2A, 1 had 2B, and 1 had 2M.

At baseline, the mean endogenous FVIII level (FVIII:C) was 16.4 IU/dL, and the mean VWF ristocetin cofactor (VWF:Rco) was 10.6 IU/dL.

The patients received rVWF at 40 to 60 IU/kg VWF:RCo intravenously 12 to 24 hours before surgery to allow FVIII:C levels to increase to at least 30 IU/dL for minor or oral surgery or to at least 60 IU/dL for major surgery, within 3 hours before surgery.

If the desired levels were achieved, rVWF could be given alone. If the levels were not achieved, patients would receive rFVIII as well, within 1 to 2 hours before surgery. Patients were monitored for 14 days after surgery.

Results

All 15 patients had overall/intraoperative hemostatic efficacy ratings of “excellent” (as good as or better than expected) or “good” (probably as good as expected).

The patients received a median of 6 (range, 2 to 15) rVWF infusions at a median dose of 55 IU/kg (range, 36.1 to 59.9). Most patients (n=11) did not receive rVWF every day. For some, infusions were separated by 2 to 9 days.

Ten patients received rVWF alone, 12 did not receive any preoperative FVIII, and 2 did not receive rVWF postoperatively.

Most rVWF infusions (89.4%, 93/104) were given alone, and 70% (7/10) of the major surgeries were performed with rVWF alone.

The researchers said that, with rVWF alone, patients had hemostatically effective levels of FVIII:C as early as 6 hours after surgery, and this was sustained for 72 to 96 hours.

There were 5 patients who received rVWF with rFVIII. Of the 11 infusions these patients received, 9 were given when FVIII:C levels were above 60 IU/dL.

Three patients received rVWF with rFVIII 1 hour before major surgery—total hip replacement, molar extraction, and left ankle prosthesis. However, 2 of these patients had FVIII:C levels above 60 IU/dL.

The patient undergoing a molar extraction received rVWF with rFVIII 6 times after surgery. In 5 cases, the patient’s FVIII:C levels were 110 to 152 IU/dL. In the remaining case, the FVIII:C level was 23 IU/dL.

Two patients received rVWF with rFVIII for minor surgery. One patient undergoing a tooth extraction received rVWF with rFVIII intraoperatively when the FVIII:C level was 72 IU/dL.

The other patient received rVWF with rFVIII after radioisotope synovectomy when the FVIII:C level was 73 IU/dL. This patient received a postoperative dose of rVWF alone as well.

One patient tested positive for binding antibodies to VWF, and 1 patient developed deep vein thrombosis 3 days after total hip replacement while receiving rVWF.

Photo from Shire

GLASGOW—Recombinant von Willebrand factor (rVWF) alone can be sufficient as perioperative management for some patients with severe von Willebrand disease (VWD), according to researchers.

In a phase 3 study, 10 of 15 patients were able to achieve hemostatic efficacy ratings of “good” or “excellent” when receiving only rVWF before, during, and/or after surgery.

The remaining 5 patients also achieved favorable hemostatic efficacy ratings, but they received recombinant factor VIII (FVIII) as well.

These results were presented at the World Federation of Hemophilia (WFH) 2018 World Congress (abstract W-MP-63 [749]). The research was sponsored by Shire, the company marketing rVWF as Vonvendi.

“There is an unmet clinical need for those living with von Willebrand disease, as they face a heightened risk of bleeding during surgery,” said study investigator Flora Peyvandi, MD, PhD, of the University of Milan in Italy.

“People with von Willebrand disease lack proper function or quantity of von Willebrand factor, and some also have a secondary factor VIII deficiency. In this study, recombinant von Willebrand factor was administered to replace the insufficient or dysfunctional von Willebrand factor, allowing the body to naturally replenish FVIII in most patients. These study results demonstrate clinical promise as physicians were able to tailor treatment based on each patient’s individual need for one or both factor therapies.”

The study included 15 adults with severe VWD who were undergoing elective surgical procedures. Ten patients were undergoing major surgery, 4 minor, and 1 oral surgery.

The patients’ median age was 40 (range, 20-70), and 8 were female. Most (n=8) had type 3 VWD, 3 had type 1, 2 had type 2A, 1 had 2B, and 1 had 2M.

At baseline, the mean endogenous FVIII level (FVIII:C) was 16.4 IU/dL, and the mean VWF ristocetin cofactor (VWF:Rco) was 10.6 IU/dL.

The patients received rVWF at 40 to 60 IU/kg VWF:RCo intravenously 12 to 24 hours before surgery to allow FVIII:C levels to increase to at least 30 IU/dL for minor or oral surgery or to at least 60 IU/dL for major surgery, within 3 hours before surgery.

If the desired levels were achieved, rVWF could be given alone. If the levels were not achieved, patients would receive rFVIII as well, within 1 to 2 hours before surgery. Patients were monitored for 14 days after surgery.

Results

All 15 patients had overall/intraoperative hemostatic efficacy ratings of “excellent” (as good as or better than expected) or “good” (probably as good as expected).

The patients received a median of 6 (range, 2 to 15) rVWF infusions at a median dose of 55 IU/kg (range, 36.1 to 59.9). Most patients (n=11) did not receive rVWF every day. For some, infusions were separated by 2 to 9 days.

Ten patients received rVWF alone, 12 did not receive any preoperative FVIII, and 2 did not receive rVWF postoperatively.

Most rVWF infusions (89.4%, 93/104) were given alone, and 70% (7/10) of the major surgeries were performed with rVWF alone.

The researchers said that, with rVWF alone, patients had hemostatically effective levels of FVIII:C as early as 6 hours after surgery, and this was sustained for 72 to 96 hours.

There were 5 patients who received rVWF with rFVIII. Of the 11 infusions these patients received, 9 were given when FVIII:C levels were above 60 IU/dL.

Three patients received rVWF with rFVIII 1 hour before major surgery—total hip replacement, molar extraction, and left ankle prosthesis. However, 2 of these patients had FVIII:C levels above 60 IU/dL.

The patient undergoing a molar extraction received rVWF with rFVIII 6 times after surgery. In 5 cases, the patient’s FVIII:C levels were 110 to 152 IU/dL. In the remaining case, the FVIII:C level was 23 IU/dL.

Two patients received rVWF with rFVIII for minor surgery. One patient undergoing a tooth extraction received rVWF with rFVIII intraoperatively when the FVIII:C level was 72 IU/dL.

The other patient received rVWF with rFVIII after radioisotope synovectomy when the FVIII:C level was 73 IU/dL. This patient received a postoperative dose of rVWF alone as well.

One patient tested positive for binding antibodies to VWF, and 1 patient developed deep vein thrombosis 3 days after total hip replacement while receiving rVWF.

Photo by Bill Branson

GLASGOW—Emicizumab prophylaxis provides “clinically meaningful” control of bleeding whether or not patients have factor VIII inhibitors, according to researchers.

In the phase 3 HAVEN 4 study, researchers evaluated emicizumab prophylaxis, given every 4 weeks, in hemophilia A patients with or without factor VIII inhibitors.

At a median follow-up of about 26 weeks, patients had a median annualized bleeding rate (ABR) of 0.0 for treated bleeds and 2.1 for all bleeds.

About 30% of patients had 0 bleeds, and about 56% had 0 treated bleeds.

There were no serious adverse events (AEs) related to emicizumab. The most common AE was injection-site reaction.

Steve Pipe, MD, of Mott Children’s Hospital in Ann Arbor, Michigan, presented these results at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday.

The trial was sponsored by Hoffmann-La Roche.

HAVEN 4 included 48 patients, age 12 and older, who had hemophilia A with or without factor VIII inhibitors. Patients were previously treated with factor VIII or bypassing agents, on-demand or as prophylaxis.

The study was conducted in 2 parts: a pharmacokinetic (PK) run-in and an expansion cohort.

All patients in the PK run-in (n=7) were previously treated on-demand and received subcutaneous emicizumab at 6 mg/kg to fully characterize the PK profile after a single dose during 4 weeks. This was followed by 6 mg/kg every 4 weeks for at least 24 weeks.

Patients in the expansion cohort (n=41) received subcutaneous emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 6 mg/kg every 4 weeks for at least 24 weeks.

Episodic treatment of breakthrough bleeds with factor VIII therapy or bypassing agents, depending on a patient’s factor VIII inhibitor status, was allowed per study protocol.

Results

The efficacy analysis included the 41 patients in the expansion cohort, 5 of whom had inhibitors at baseline.

The median efficacy period was 25.6 weeks. The median ABR was 2.1 for all bleeds and 0.0 for treated bleeds.

The percentage of patients with 0 bleeds was 29.3% for all bleeds, 56.1% for treated bleeds, 82.9% for treated spontaneous bleeds, 70.7% for treated joint bleeds, and 85.4% for treated target joint bleeds.

Most treated bleeds (74.5%, 38/51) were traumatic.

There were 148 AEs, and 73.2% of patients had at least 1 AE.

Injection-site reaction was the most common AE related to emicizumab, occurring in 22.0% of patients (n=9).

There were 2 serious AEs (grade ≥3)—hypertension and rhabdomyolysis. Both were considered unrelated to emicizumab.

There were no AEs leading to emicizumab discontinuation or withdrawal. There were no thrombotic events, cases of thrombotic microangiopathy, hypersensitivity reactions, or fatalities.

None of the patients developed de novo factor VIII inhibitors, and there were no anti-drug antibodies detected.

Photo by Bill Branson

GLASGOW—Emicizumab prophylaxis provides “clinically meaningful” control of bleeding whether or not patients have factor VIII inhibitors, according to researchers.

In the phase 3 HAVEN 4 study, researchers evaluated emicizumab prophylaxis, given every 4 weeks, in hemophilia A patients with or without factor VIII inhibitors.

At a median follow-up of about 26 weeks, patients had a median annualized bleeding rate (ABR) of 0.0 for treated bleeds and 2.1 for all bleeds.

About 30% of patients had 0 bleeds, and about 56% had 0 treated bleeds.

There were no serious adverse events (AEs) related to emicizumab. The most common AE was injection-site reaction.

Steve Pipe, MD, of Mott Children’s Hospital in Ann Arbor, Michigan, presented these results at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday.

The trial was sponsored by Hoffmann-La Roche.

HAVEN 4 included 48 patients, age 12 and older, who had hemophilia A with or without factor VIII inhibitors. Patients were previously treated with factor VIII or bypassing agents, on-demand or as prophylaxis.

The study was conducted in 2 parts: a pharmacokinetic (PK) run-in and an expansion cohort.

All patients in the PK run-in (n=7) were previously treated on-demand and received subcutaneous emicizumab at 6 mg/kg to fully characterize the PK profile after a single dose during 4 weeks. This was followed by 6 mg/kg every 4 weeks for at least 24 weeks.

Patients in the expansion cohort (n=41) received subcutaneous emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 6 mg/kg every 4 weeks for at least 24 weeks.

Episodic treatment of breakthrough bleeds with factor VIII therapy or bypassing agents, depending on a patient’s factor VIII inhibitor status, was allowed per study protocol.

Results

The efficacy analysis included the 41 patients in the expansion cohort, 5 of whom had inhibitors at baseline.

The median efficacy period was 25.6 weeks. The median ABR was 2.1 for all bleeds and 0.0 for treated bleeds.

The percentage of patients with 0 bleeds was 29.3% for all bleeds, 56.1% for treated bleeds, 82.9% for treated spontaneous bleeds, 70.7% for treated joint bleeds, and 85.4% for treated target joint bleeds.

Most treated bleeds (74.5%, 38/51) were traumatic.

There were 148 AEs, and 73.2% of patients had at least 1 AE.

Injection-site reaction was the most common AE related to emicizumab, occurring in 22.0% of patients (n=9).

There were 2 serious AEs (grade ≥3)—hypertension and rhabdomyolysis. Both were considered unrelated to emicizumab.

There were no AEs leading to emicizumab discontinuation or withdrawal. There were no thrombotic events, cases of thrombotic microangiopathy, hypersensitivity reactions, or fatalities.

None of the patients developed de novo factor VIII inhibitors, and there were no anti-drug antibodies detected.

Photo by Bill Branson

GLASGOW—Emicizumab prophylaxis provides “clinically meaningful” control of bleeding whether or not patients have factor VIII inhibitors, according to researchers.

In the phase 3 HAVEN 4 study, researchers evaluated emicizumab prophylaxis, given every 4 weeks, in hemophilia A patients with or without factor VIII inhibitors.

At a median follow-up of about 26 weeks, patients had a median annualized bleeding rate (ABR) of 0.0 for treated bleeds and 2.1 for all bleeds.

About 30% of patients had 0 bleeds, and about 56% had 0 treated bleeds.

There were no serious adverse events (AEs) related to emicizumab. The most common AE was injection-site reaction.

Steve Pipe, MD, of Mott Children’s Hospital in Ann Arbor, Michigan, presented these results at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday.

The trial was sponsored by Hoffmann-La Roche.

HAVEN 4 included 48 patients, age 12 and older, who had hemophilia A with or without factor VIII inhibitors. Patients were previously treated with factor VIII or bypassing agents, on-demand or as prophylaxis.

The study was conducted in 2 parts: a pharmacokinetic (PK) run-in and an expansion cohort.

All patients in the PK run-in (n=7) were previously treated on-demand and received subcutaneous emicizumab at 6 mg/kg to fully characterize the PK profile after a single dose during 4 weeks. This was followed by 6 mg/kg every 4 weeks for at least 24 weeks.

Patients in the expansion cohort (n=41) received subcutaneous emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 6 mg/kg every 4 weeks for at least 24 weeks.

Episodic treatment of breakthrough bleeds with factor VIII therapy or bypassing agents, depending on a patient’s factor VIII inhibitor status, was allowed per study protocol.

Results

The efficacy analysis included the 41 patients in the expansion cohort, 5 of whom had inhibitors at baseline.

The median efficacy period was 25.6 weeks. The median ABR was 2.1 for all bleeds and 0.0 for treated bleeds.

The percentage of patients with 0 bleeds was 29.3% for all bleeds, 56.1% for treated bleeds, 82.9% for treated spontaneous bleeds, 70.7% for treated joint bleeds, and 85.4% for treated target joint bleeds.

Most treated bleeds (74.5%, 38/51) were traumatic.

There were 148 AEs, and 73.2% of patients had at least 1 AE.

Injection-site reaction was the most common AE related to emicizumab, occurring in 22.0% of patients (n=9).

There were 2 serious AEs (grade ≥3)—hypertension and rhabdomyolysis. Both were considered unrelated to emicizumab.

There were no AEs leading to emicizumab discontinuation or withdrawal. There were no thrombotic events, cases of thrombotic microangiopathy, hypersensitivity reactions, or fatalities.

None of the patients developed de novo factor VIII inhibitors, and there were no anti-drug antibodies detected.

Image by Spencer Phillips

GLASGOW—New research suggests the gene therapy SPK-9001 can reduce bleeding and the need for factor IX infusions in patients with hemophilia B.

In an ongoing, phase 1/2 trial, SPK-9001 reduced the annualized bleeding rate (ABR) by 98% and the annualized infusion rate (AIR) by 99%.

All 15 patients treated with SPK-9001 have discontinued factor IX prophylaxis.

There have been no serious adverse events (AEs), no thrombotic events, and no factor IX inhibitors observed to date.

Spencer K. Sullivan, MD, of the Mississippi Center for Advanced Medicine in Madison, Mississippi, presented these results at the World Federation of Hemophilia (WFH) 2018 World Congress during the “Free Papers: Gene Therapy” session on Tuesday.

The research was sponsored by Spark Therapeutics, the company developing SPK-9001 in collaboration with Pfizer.

SPK-9001 is an investigational vector that contains a bio-engineered adeno-associated virus capsid and a codon-optimized, high-activity human factor IX gene enabling endogenous production of factor IX.

Dr Sullivan reported results with SPK-9001 in 15 patients with severe or moderately severe hemophilia B.

As of the May 7, 2018, data cutoff, there were 13 patients with at least 12 weeks of follow-up after SPK-9001 infusion, which is the length of time required to achieve steady-state factor IX activity levels. All 13 patients reached stable factor IX levels of more than 12%.

The range of steady-state factor IX activity level, beginning at 12 weeks through 52 weeks of follow-up for the first 10 patients infused, was 14.3% to 76.8%.

The next 3 patients were infused with SPK-9001 manufactured using an enhanced process and reached 12 or more weeks of follow-up. For these patients, the range of steady-state factor IX activity level was 38.1% to 54.5%.

The 2 remaining patients had only 5 weeks and 11 weeks of follow-up as of the cut-off date.

Based on individual participant history for the year prior to the study, the overall ABR for all 15 patients was reduced by 98% four weeks after SPK-9001 treatment.

The ABR was 0.2 bleeds per patient after SPK-9001, compared to an ABR of 8.9 before SPK-9001.

One patient experienced a bleeding event 4 or more weeks after SPK-9001 infusion.

The overall AIR was reduced by 99% (based on data after week 4) for all 15 patients. The AIR was 0.9 infusions per patient after SPK-9001, compared to 57.2 infusions before SPK-9001.

Six patients received factor IX infusions following SPK-9001 administration—2 for reported spontaneous bleeds, 2 prior to surgery, 1 at the end of the study (discretionary, per protocol), and 1 for prophylaxis for a minor, traumatic non-bleeding event.

However, all 15 patients have discontinued regular factor IX prophylaxis.

There have been no serious AEs or factor IX inhibitors reported.

Two patients (1 who received SPK-9001 manufactured using the enhanced process) experienced related AEs of elevated transaminases, which were asymptomatic.

These patients were treated with a tapering course of oral corticosteroids, and 1 event resolved before the data cutoff.

An additional patient received a tapering course of oral corticosteroids for an increase in liver enzymes (not exceeding the upper limit of normal) temporally associated with falling levels of factor IX activity.

“We are pleased to see all 15 participants, notably including the first 4 participants who have been followed for more than 2 years, continue to show that a single administration of SPK-9001 has resulted in dramatic reductions in bleeding and factor IX infusions, with no serious adverse events,” said Katherine A. High, MD, president and head of research & development at Spark Therapeutics.

“Our commitment to gene therapy research across our hemophilia programs remains steadfast with the goal of developing a novel therapeutic approach with a positive benefit-risk profile that aims to free patients of the need for regular infusions, while eliminating spontaneous bleeding.”

Image by Spencer Phillips

GLASGOW—New research suggests the gene therapy SPK-9001 can reduce bleeding and the need for factor IX infusions in patients with hemophilia B.

In an ongoing, phase 1/2 trial, SPK-9001 reduced the annualized bleeding rate (ABR) by 98% and the annualized infusion rate (AIR) by 99%.

All 15 patients treated with SPK-9001 have discontinued factor IX prophylaxis.

There have been no serious adverse events (AEs), no thrombotic events, and no factor IX inhibitors observed to date.

Spencer K. Sullivan, MD, of the Mississippi Center for Advanced Medicine in Madison, Mississippi, presented these results at the World Federation of Hemophilia (WFH) 2018 World Congress during the “Free Papers: Gene Therapy” session on Tuesday.

The research was sponsored by Spark Therapeutics, the company developing SPK-9001 in collaboration with Pfizer.

SPK-9001 is an investigational vector that contains a bio-engineered adeno-associated virus capsid and a codon-optimized, high-activity human factor IX gene enabling endogenous production of factor IX.

Dr Sullivan reported results with SPK-9001 in 15 patients with severe or moderately severe hemophilia B.

As of the May 7, 2018, data cutoff, there were 13 patients with at least 12 weeks of follow-up after SPK-9001 infusion, which is the length of time required to achieve steady-state factor IX activity levels. All 13 patients reached stable factor IX levels of more than 12%.

The range of steady-state factor IX activity level, beginning at 12 weeks through 52 weeks of follow-up for the first 10 patients infused, was 14.3% to 76.8%.

The next 3 patients were infused with SPK-9001 manufactured using an enhanced process and reached 12 or more weeks of follow-up. For these patients, the range of steady-state factor IX activity level was 38.1% to 54.5%.

The 2 remaining patients had only 5 weeks and 11 weeks of follow-up as of the cut-off date.

Based on individual participant history for the year prior to the study, the overall ABR for all 15 patients was reduced by 98% four weeks after SPK-9001 treatment.

The ABR was 0.2 bleeds per patient after SPK-9001, compared to an ABR of 8.9 before SPK-9001.

One patient experienced a bleeding event 4 or more weeks after SPK-9001 infusion.

The overall AIR was reduced by 99% (based on data after week 4) for all 15 patients. The AIR was 0.9 infusions per patient after SPK-9001, compared to 57.2 infusions before SPK-9001.

Six patients received factor IX infusions following SPK-9001 administration—2 for reported spontaneous bleeds, 2 prior to surgery, 1 at the end of the study (discretionary, per protocol), and 1 for prophylaxis for a minor, traumatic non-bleeding event.

However, all 15 patients have discontinued regular factor IX prophylaxis.

There have been no serious AEs or factor IX inhibitors reported.

Two patients (1 who received SPK-9001 manufactured using the enhanced process) experienced related AEs of elevated transaminases, which were asymptomatic.

These patients were treated with a tapering course of oral corticosteroids, and 1 event resolved before the data cutoff.

An additional patient received a tapering course of oral corticosteroids for an increase in liver enzymes (not exceeding the upper limit of normal) temporally associated with falling levels of factor IX activity.

“We are pleased to see all 15 participants, notably including the first 4 participants who have been followed for more than 2 years, continue to show that a single administration of SPK-9001 has resulted in dramatic reductions in bleeding and factor IX infusions, with no serious adverse events,” said Katherine A. High, MD, president and head of research & development at Spark Therapeutics.

“Our commitment to gene therapy research across our hemophilia programs remains steadfast with the goal of developing a novel therapeutic approach with a positive benefit-risk profile that aims to free patients of the need for regular infusions, while eliminating spontaneous bleeding.”

Image by Spencer Phillips

GLASGOW—New research suggests the gene therapy SPK-9001 can reduce bleeding and the need for factor IX infusions in patients with hemophilia B.

In an ongoing, phase 1/2 trial, SPK-9001 reduced the annualized bleeding rate (ABR) by 98% and the annualized infusion rate (AIR) by 99%.

All 15 patients treated with SPK-9001 have discontinued factor IX prophylaxis.

There have been no serious adverse events (AEs), no thrombotic events, and no factor IX inhibitors observed to date.

Spencer K. Sullivan, MD, of the Mississippi Center for Advanced Medicine in Madison, Mississippi, presented these results at the World Federation of Hemophilia (WFH) 2018 World Congress during the “Free Papers: Gene Therapy” session on Tuesday.

The research was sponsored by Spark Therapeutics, the company developing SPK-9001 in collaboration with Pfizer.

SPK-9001 is an investigational vector that contains a bio-engineered adeno-associated virus capsid and a codon-optimized, high-activity human factor IX gene enabling endogenous production of factor IX.

Dr Sullivan reported results with SPK-9001 in 15 patients with severe or moderately severe hemophilia B.

As of the May 7, 2018, data cutoff, there were 13 patients with at least 12 weeks of follow-up after SPK-9001 infusion, which is the length of time required to achieve steady-state factor IX activity levels. All 13 patients reached stable factor IX levels of more than 12%.

The range of steady-state factor IX activity level, beginning at 12 weeks through 52 weeks of follow-up for the first 10 patients infused, was 14.3% to 76.8%.

The next 3 patients were infused with SPK-9001 manufactured using an enhanced process and reached 12 or more weeks of follow-up. For these patients, the range of steady-state factor IX activity level was 38.1% to 54.5%.

The 2 remaining patients had only 5 weeks and 11 weeks of follow-up as of the cut-off date.

Based on individual participant history for the year prior to the study, the overall ABR for all 15 patients was reduced by 98% four weeks after SPK-9001 treatment.

The ABR was 0.2 bleeds per patient after SPK-9001, compared to an ABR of 8.9 before SPK-9001.

One patient experienced a bleeding event 4 or more weeks after SPK-9001 infusion.

The overall AIR was reduced by 99% (based on data after week 4) for all 15 patients. The AIR was 0.9 infusions per patient after SPK-9001, compared to 57.2 infusions before SPK-9001.

Six patients received factor IX infusions following SPK-9001 administration—2 for reported spontaneous bleeds, 2 prior to surgery, 1 at the end of the study (discretionary, per protocol), and 1 for prophylaxis for a minor, traumatic non-bleeding event.

However, all 15 patients have discontinued regular factor IX prophylaxis.

There have been no serious AEs or factor IX inhibitors reported.

Two patients (1 who received SPK-9001 manufactured using the enhanced process) experienced related AEs of elevated transaminases, which were asymptomatic.

These patients were treated with a tapering course of oral corticosteroids, and 1 event resolved before the data cutoff.

An additional patient received a tapering course of oral corticosteroids for an increase in liver enzymes (not exceeding the upper limit of normal) temporally associated with falling levels of factor IX activity.

“We are pleased to see all 15 participants, notably including the first 4 participants who have been followed for more than 2 years, continue to show that a single administration of SPK-9001 has resulted in dramatic reductions in bleeding and factor IX infusions, with no serious adverse events,” said Katherine A. High, MD, president and head of research & development at Spark Therapeutics.

“Our commitment to gene therapy research across our hemophilia programs remains steadfast with the goal of developing a novel therapeutic approach with a positive benefit-risk profile that aims to free patients of the need for regular infusions, while eliminating spontaneous bleeding.”

Photo from Novo Nordisk

GLASGOW—Nonacog beta pegol (N9-GP) has a better pharmacokinetic (PK) profile than recombinant factor IX-Fc fusion protein (rFIXFc), according to researchers.

In a phase 1 trial, adults with hemophilia B who received a single dose of N9-GP achieved greater total factor IX exposure than those treated with rFIXFc, and N9-GP had a longer half-life.

Seven days after injection, factor IX activity was 6-fold greater in patients treated with N9-GP than in those treated with rFIXFc at the same dose.

“As a clinician, I know first-hand how challenging it can be to help people living with hemophilia B reach their treatment goals and be adequately protected from bleeding,” said Carmen Escuriola Ettingshausen, MD, of Haemophilia Centre Rhein Main in Frankfurt-Mörfelden, Germany.

“These data will help us better understand the different treatment options and choose the appropriate treatment for each patient.”

Dr Ettingshausen presented the data at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday.

The research was sponsored by Novo Nordisk A/S, the company marketing N9-GP (as Rebinyn or Refixia). N9-GP is an extended half-life factor IX molecule intended for replacement therapy in patients with hemophilia B.

In the Paradigm7 trial, researchers compared the PK profiles of N9-GP and rFIXFc (Alprolix).

Fifteen previously treated adult males with congenital hemophilia B (factor IX activity ≤2%) received single injections (50 IU/kg) of N9-GP and rFIXFc with at least 21 days between doses.

One patient was excluded from the analysis due to intake of a prohibited medication (an rFIXFc product that was not Alprolix). Two other patients were excluded from some analyses because they missed 2 PK time points.

The primary endpoint was dose-normalized area under the factor IX activity-time curve from 0 to infinity (AUC_0-inf,norm).

The estimated AUC_0-inf,norm (n=12) was significantly higher for N9-GP than rFIXFc—9656 IU*h/dL and 2199 IU*h/dL, respectively (ratio=4.39, P<0.0001).

There were significant differences for secondary endpoints as well.

The maximum factor IX activity dose-normalized to 50 IU/kg (n=14) was 91 IU/dL with N9-GP and 45 IU/dL with rFIXFc (ratio=2.02, P<0.001).

The incremental recovery at 30 minutes (n=14) was 1.7 (IU/dL)/(IU/kg) with N9-GP and 0.8 (IU/dL)/(IU/kg) with rFIXFc (ratio=2.20, P<0.001).

The terminal half-life (n=12) was 103.2 hours with N9-GP and 84.9 hours with rFIXFc (ratio=1.22, P<0.001).

The clearance (n=12) was 0.52 mL/h/kg with N9-GP and 2.25 mL/h/kg with rFIXFc (ratio=0.23, P<0.001).

The factor IX activity at 168 hours (n=12) was 19 IU/dL with N9-GP and 3 IU/dL with rFIXFc (ratio=5.80, P<0.001).

None of the patients developed inhibitors, and no safety concerns were identified, according to Novo Nordisk. The company did not provide additional safety information.

Photo from Novo Nordisk

GLASGOW—Nonacog beta pegol (N9-GP) has a better pharmacokinetic (PK) profile than recombinant factor IX-Fc fusion protein (rFIXFc), according to researchers.

In a phase 1 trial, adults with hemophilia B who received a single dose of N9-GP achieved greater total factor IX exposure than those treated with rFIXFc, and N9-GP had a longer half-life.

Seven days after injection, factor IX activity was 6-fold greater in patients treated with N9-GP than in those treated with rFIXFc at the same dose.

“As a clinician, I know first-hand how challenging it can be to help people living with hemophilia B reach their treatment goals and be adequately protected from bleeding,” said Carmen Escuriola Ettingshausen, MD, of Haemophilia Centre Rhein Main in Frankfurt-Mörfelden, Germany.

“These data will help us better understand the different treatment options and choose the appropriate treatment for each patient.”

Dr Ettingshausen presented the data at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday.

The research was sponsored by Novo Nordisk A/S, the company marketing N9-GP (as Rebinyn or Refixia). N9-GP is an extended half-life factor IX molecule intended for replacement therapy in patients with hemophilia B.

In the Paradigm7 trial, researchers compared the PK profiles of N9-GP and rFIXFc (Alprolix).

Fifteen previously treated adult males with congenital hemophilia B (factor IX activity ≤2%) received single injections (50 IU/kg) of N9-GP and rFIXFc with at least 21 days between doses.

One patient was excluded from the analysis due to intake of a prohibited medication (an rFIXFc product that was not Alprolix). Two other patients were excluded from some analyses because they missed 2 PK time points.

The primary endpoint was dose-normalized area under the factor IX activity-time curve from 0 to infinity (AUC_0-inf,norm).

The estimated AUC_0-inf,norm (n=12) was significantly higher for N9-GP than rFIXFc—9656 IU*h/dL and 2199 IU*h/dL, respectively (ratio=4.39, P<0.0001).

There were significant differences for secondary endpoints as well.

The maximum factor IX activity dose-normalized to 50 IU/kg (n=14) was 91 IU/dL with N9-GP and 45 IU/dL with rFIXFc (ratio=2.02, P<0.001).

The incremental recovery at 30 minutes (n=14) was 1.7 (IU/dL)/(IU/kg) with N9-GP and 0.8 (IU/dL)/(IU/kg) with rFIXFc (ratio=2.20, P<0.001).

The terminal half-life (n=12) was 103.2 hours with N9-GP and 84.9 hours with rFIXFc (ratio=1.22, P<0.001).

The clearance (n=12) was 0.52 mL/h/kg with N9-GP and 2.25 mL/h/kg with rFIXFc (ratio=0.23, P<0.001).

The factor IX activity at 168 hours (n=12) was 19 IU/dL with N9-GP and 3 IU/dL with rFIXFc (ratio=5.80, P<0.001).

None of the patients developed inhibitors, and no safety concerns were identified, according to Novo Nordisk. The company did not provide additional safety information.

Photo from Novo Nordisk

GLASGOW—Nonacog beta pegol (N9-GP) has a better pharmacokinetic (PK) profile than recombinant factor IX-Fc fusion protein (rFIXFc), according to researchers.

In a phase 1 trial, adults with hemophilia B who received a single dose of N9-GP achieved greater total factor IX exposure than those treated with rFIXFc, and N9-GP had a longer half-life.

Seven days after injection, factor IX activity was 6-fold greater in patients treated with N9-GP than in those treated with rFIXFc at the same dose.

“As a clinician, I know first-hand how challenging it can be to help people living with hemophilia B reach their treatment goals and be adequately protected from bleeding,” said Carmen Escuriola Ettingshausen, MD, of Haemophilia Centre Rhein Main in Frankfurt-Mörfelden, Germany.

“These data will help us better understand the different treatment options and choose the appropriate treatment for each patient.”

Dr Ettingshausen presented the data at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday.

The research was sponsored by Novo Nordisk A/S, the company marketing N9-GP (as Rebinyn or Refixia). N9-GP is an extended half-life factor IX molecule intended for replacement therapy in patients with hemophilia B.

In the Paradigm7 trial, researchers compared the PK profiles of N9-GP and rFIXFc (Alprolix).

Fifteen previously treated adult males with congenital hemophilia B (factor IX activity ≤2%) received single injections (50 IU/kg) of N9-GP and rFIXFc with at least 21 days between doses.

One patient was excluded from the analysis due to intake of a prohibited medication (an rFIXFc product that was not Alprolix). Two other patients were excluded from some analyses because they missed 2 PK time points.

The primary endpoint was dose-normalized area under the factor IX activity-time curve from 0 to infinity (AUC_0-inf,norm).

The estimated AUC_0-inf,norm (n=12) was significantly higher for N9-GP than rFIXFc—9656 IU*h/dL and 2199 IU*h/dL, respectively (ratio=4.39, P<0.0001).

There were significant differences for secondary endpoints as well.

The maximum factor IX activity dose-normalized to 50 IU/kg (n=14) was 91 IU/dL with N9-GP and 45 IU/dL with rFIXFc (ratio=2.02, P<0.001).

The incremental recovery at 30 minutes (n=14) was 1.7 (IU/dL)/(IU/kg) with N9-GP and 0.8 (IU/dL)/(IU/kg) with rFIXFc (ratio=2.20, P<0.001).

The terminal half-life (n=12) was 103.2 hours with N9-GP and 84.9 hours with rFIXFc (ratio=1.22, P<0.001).

The clearance (n=12) was 0.52 mL/h/kg with N9-GP and 2.25 mL/h/kg with rFIXFc (ratio=0.23, P<0.001).

The factor IX activity at 168 hours (n=12) was 19 IU/dL with N9-GP and 3 IU/dL with rFIXFc (ratio=5.80, P<0.001).

None of the patients developed inhibitors, and no safety concerns were identified, according to Novo Nordisk. The company did not provide additional safety information.

Antihemophilic factor

GLASGOW—Preliminary data suggest an investigational therapy can extend the half-life of factor VIII (FVIII) in patients with severe hemophilia A.

Researchers are testing the therapy, BIVV001, in a phase 1/2a trial and have reported results in 4 patients.

BIVV001 extended the half-life of FVIII to 37 hours, with an average FVIII activity of 5.6% at 7 days post-infusion.

“For decades, scientists have been trying to overcome the von Willebrand factor ceiling, which imposes a limit on the half-life of FVIII, and these data demonstrate that BIVV001 has finally broken through that ceiling,” said Joachim Fruebis, PhD, senior vice president of development at Bioverativ Inc.

Dr Fruebis presented these data at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday.

The research was sponsored by Bioverativ, the company developing BIVV001.

BIVV001 (rFVIIIFc-VWF-XTEN) is a recombinant FVIII therapy that builds on Fc fusion technology by adding a region of von Willebrand factor and XTEN polypeptides to potentially extend its time in circulation.

In the phase 1/2a EXTEN-A trial, researchers are evaluating the safety and pharmacokinetics of BIVV001 in a low-dose and high-dose cohort of subjects, ages 18 to 65, who have severe hemophilia A.

In the data presented at the WFH World Congress, 4 adult males received a single dose of recombinant FVIII therapy (25 IU/kg) followed, after a washout period, by a single, low dose of BIVV001 (25 IU/kg).

Primary endpoints of this study include the occurrence of adverse events and the development of inhibitors.

No inhibitors have been detected, and BIBV001 was “generally well-tolerated,” according to Bioverativ. The company did not provide additional safety information.

BIVV001 extended the half-life of FVIII to 37 hours, which is an increase over the 13 hours seen with recombinant FVIII.

The average FVIII activity for the 4 subjects was 13.0% at 5 days and 5.6% at 7 days post-infusion.

“Importantly for the hemophilia community, the factor levels seen in this study are unparalleled in hemophilia A,” Dr Fruebis said, “and we are excited about the potential for BIVV001 to transform the treatment paradigm for patients and physicians.”

Antihemophilic factor

GLASGOW—Preliminary data suggest an investigational therapy can extend the half-life of factor VIII (FVIII) in patients with severe hemophilia A.

Researchers are testing the therapy, BIVV001, in a phase 1/2a trial and have reported results in 4 patients.

BIVV001 extended the half-life of FVIII to 37 hours, with an average FVIII activity of 5.6% at 7 days post-infusion.

“For decades, scientists have been trying to overcome the von Willebrand factor ceiling, which imposes a limit on the half-life of FVIII, and these data demonstrate that BIVV001 has finally broken through that ceiling,” said Joachim Fruebis, PhD, senior vice president of development at Bioverativ Inc.

Dr Fruebis presented these data at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday.

The research was sponsored by Bioverativ, the company developing BIVV001.

BIVV001 (rFVIIIFc-VWF-XTEN) is a recombinant FVIII therapy that builds on Fc fusion technology by adding a region of von Willebrand factor and XTEN polypeptides to potentially extend its time in circulation.

In the phase 1/2a EXTEN-A trial, researchers are evaluating the safety and pharmacokinetics of BIVV001 in a low-dose and high-dose cohort of subjects, ages 18 to 65, who have severe hemophilia A.

In the data presented at the WFH World Congress, 4 adult males received a single dose of recombinant FVIII therapy (25 IU/kg) followed, after a washout period, by a single, low dose of BIVV001 (25 IU/kg).

Primary endpoints of this study include the occurrence of adverse events and the development of inhibitors.

No inhibitors have been detected, and BIBV001 was “generally well-tolerated,” according to Bioverativ. The company did not provide additional safety information.

BIVV001 extended the half-life of FVIII to 37 hours, which is an increase over the 13 hours seen with recombinant FVIII.

The average FVIII activity for the 4 subjects was 13.0% at 5 days and 5.6% at 7 days post-infusion.

“Importantly for the hemophilia community, the factor levels seen in this study are unparalleled in hemophilia A,” Dr Fruebis said, “and we are excited about the potential for BIVV001 to transform the treatment paradigm for patients and physicians.”

Antihemophilic factor

GLASGOW—Preliminary data suggest an investigational therapy can extend the half-life of factor VIII (FVIII) in patients with severe hemophilia A.

Researchers are testing the therapy, BIVV001, in a phase 1/2a trial and have reported results in 4 patients.

BIVV001 extended the half-life of FVIII to 37 hours, with an average FVIII activity of 5.6% at 7 days post-infusion.

“For decades, scientists have been trying to overcome the von Willebrand factor ceiling, which imposes a limit on the half-life of FVIII, and these data demonstrate that BIVV001 has finally broken through that ceiling,” said Joachim Fruebis, PhD, senior vice president of development at Bioverativ Inc.

Dr Fruebis presented these data at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday.

The research was sponsored by Bioverativ, the company developing BIVV001.

BIVV001 (rFVIIIFc-VWF-XTEN) is a recombinant FVIII therapy that builds on Fc fusion technology by adding a region of von Willebrand factor and XTEN polypeptides to potentially extend its time in circulation.

In the phase 1/2a EXTEN-A trial, researchers are evaluating the safety and pharmacokinetics of BIVV001 in a low-dose and high-dose cohort of subjects, ages 18 to 65, who have severe hemophilia A.

In the data presented at the WFH World Congress, 4 adult males received a single dose of recombinant FVIII therapy (25 IU/kg) followed, after a washout period, by a single, low dose of BIVV001 (25 IU/kg).

Primary endpoints of this study include the occurrence of adverse events and the development of inhibitors.

No inhibitors have been detected, and BIBV001 was “generally well-tolerated,” according to Bioverativ. The company did not provide additional safety information.

BIVV001 extended the half-life of FVIII to 37 hours, which is an increase over the 13 hours seen with recombinant FVIII.

The average FVIII activity for the 4 subjects was 13.0% at 5 days and 5.6% at 7 days post-infusion.

“Importantly for the hemophilia community, the factor levels seen in this study are unparalleled in hemophilia A,” Dr Fruebis said, “and we are excited about the potential for BIVV001 to transform the treatment paradigm for patients and physicians.”

Photo from Business Wire

GLASGOW—Final results from the HAVEN 3 study suggest emicizumab prophylaxis can reduce bleeding in hemophilia A patients without factor VIII inhibitors.

Compared to patients who did not receive prophylaxis, those who received emicizumab prophylaxis had a 96% to 97% reduction in treated bleeds and a 94% to 95% reduction in all bleeds.

An intra-patient comparison showed a 68% reduction in treated bleeds with once-weekly emicizumab, compared to prior factor VIII prophylaxis.

“[Emicizumab] is the first medicine to show superior efficacy to prior factor VIII prophylaxis, the current standard of care therapy, as demonstrated by a statistically significant reduction in treated bleeds in the HAVEN 3 study intra-patient comparison,” said Johnny Mahlangu, MB BCh, of the University of the Witwatersrand in Johannesburg, South Africa.

Dr Mahlangu presented these results at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday. HAVEN 3 was sponsored by Hoffmann-La Roche.

Patients and treatment

In this phase 3 trial, researchers evaluated emicizumab in patients with hemophilia A without factor VIII inhibitors. The study included 152 patients who were 12 years of age or older and were previously treated with factor VIII therapy on-demand or as prophylaxis.

Patients previously treated with on-demand factor VIII were randomized in a 2:2:1 fashion to receive:

• Emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 1.5 mg/kg/wk until the end of study (arm A, n=36)
• Emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 3 mg/kg/2wks for at least 24 weeks (arm B, n=35)
• No prophylaxis, only episodic/on-demand factor VIII treatment (arm C, n=18).

Patients previously treated with factor VIII prophylaxis received emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 1.5 mg/kg/wk until the end of study (arm D, n=63).

Episodic treatment of breakthrough bleeds with factor VIII therapy was allowed per protocol.

Emicizumab vs no prophylaxis

The model-based (negative binomial regression model) annualized bleeding rate (ABR) for treated bleeds was 1.5 in arm A, 1.3 in arm B, and 38.2 in arm C. The median ABR for treated bleeds was 0 in arms A and B and 40.4 in arm C.

Compared to patients in arm C, those in arm A had a 96% (P<0.0001) reduction in treated bleeds, and those in arm B had a 97% (P<0.0001) reduction in treated bleeds.

None of the patients in arm C had 0 treated bleeds, compared to 55.6% of patients in arm A and 60% of patients in arm B.

The model-based ABR for all bleeds was 2.5 in arm A, 2.6 in arm B, and 47.6 in arm C.

Patients in arm A had a 95% reduction in all bleeds (P<0.0001), and patients in arm B had a 94% reduction in all bleeds (P<0.0001), compared to patients in arm C.

Fifty percent of patients in arm A had 0 total bleeds, as did 40% of patients in arm B and 0% of patients in arm C.

Intra-patient comparison

The researchers compared previous prophylaxis to once-weekly emicizumab prophylaxis in 48 patients from arm D.

The model-based ABR for treated bleeds was 4.8 with prior prophylaxis and 1.5 with emicizumab. The median ABR for treated bleeds was 1.8 and 0.0, respectively.

Patients had a 68% reduction in treated bleeds with emicizumab (P<0.0001).

With prior prophylaxis, 39.6% of patients had 0 treated bleeds. With emicizumab, 54.2% of patients had 0 treated bleeds.

Safety

There were no serious adverse events (AEs) related to emicizumab, no anti-drug antibodies detected, and none of the patients on emicizumab developed de novo factor VIII inhibitors.

Injection-site reactions occurred in 25.3% of all patients (38/150), 25% of patients in arm A (9/36), 20% in arm B (7/35), 12.5% in arm C (2/16), and 31.7% in arm D (20/63).

An additional patient in arm D (who was included in the total) reported an “injection-site erythema,” not an “injection-site reaction.”

Upper respiratory tract infections occurred in 10.7% of all patients (n=16), 11.1% (n=4) of those in arm A, 11.4% (n=4) of those in arm B, 0% of those in arm C, and 12.7% (n=8) of those in arm D.

Other AEs occurring in at least 5% of patients were arthralgia (19%), nasopharyngitis (12%), headache (11%), and influenza (6%).

One patient in arm B discontinued emicizumab due to multiple mild AEs—insomnia, hair loss, nightmare, lethargy, depressed mood, headache, and pruritus.

Two patients were lost to follow-up—1 in arm A and 1 in arm C.

Photo from Business Wire

GLASGOW—Final results from the HAVEN 3 study suggest emicizumab prophylaxis can reduce bleeding in hemophilia A patients without factor VIII inhibitors.

Compared to patients who did not receive prophylaxis, those who received emicizumab prophylaxis had a 96% to 97% reduction in treated bleeds and a 94% to 95% reduction in all bleeds.

An intra-patient comparison showed a 68% reduction in treated bleeds with once-weekly emicizumab, compared to prior factor VIII prophylaxis.

“[Emicizumab] is the first medicine to show superior efficacy to prior factor VIII prophylaxis, the current standard of care therapy, as demonstrated by a statistically significant reduction in treated bleeds in the HAVEN 3 study intra-patient comparison,” said Johnny Mahlangu, MB BCh, of the University of the Witwatersrand in Johannesburg, South Africa.

Dr Mahlangu presented these results at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday. HAVEN 3 was sponsored by Hoffmann-La Roche.

Patients and treatment

In this phase 3 trial, researchers evaluated emicizumab in patients with hemophilia A without factor VIII inhibitors. The study included 152 patients who were 12 years of age or older and were previously treated with factor VIII therapy on-demand or as prophylaxis.

Patients previously treated with on-demand factor VIII were randomized in a 2:2:1 fashion to receive:

• Emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 1.5 mg/kg/wk until the end of study (arm A, n=36)
• Emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 3 mg/kg/2wks for at least 24 weeks (arm B, n=35)
• No prophylaxis, only episodic/on-demand factor VIII treatment (arm C, n=18).

Patients previously treated with factor VIII prophylaxis received emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 1.5 mg/kg/wk until the end of study (arm D, n=63).

Episodic treatment of breakthrough bleeds with factor VIII therapy was allowed per protocol.

Emicizumab vs no prophylaxis

The model-based (negative binomial regression model) annualized bleeding rate (ABR) for treated bleeds was 1.5 in arm A, 1.3 in arm B, and 38.2 in arm C. The median ABR for treated bleeds was 0 in arms A and B and 40.4 in arm C.

Compared to patients in arm C, those in arm A had a 96% (P<0.0001) reduction in treated bleeds, and those in arm B had a 97% (P<0.0001) reduction in treated bleeds.

None of the patients in arm C had 0 treated bleeds, compared to 55.6% of patients in arm A and 60% of patients in arm B.

The model-based ABR for all bleeds was 2.5 in arm A, 2.6 in arm B, and 47.6 in arm C.

Patients in arm A had a 95% reduction in all bleeds (P<0.0001), and patients in arm B had a 94% reduction in all bleeds (P<0.0001), compared to patients in arm C.

Fifty percent of patients in arm A had 0 total bleeds, as did 40% of patients in arm B and 0% of patients in arm C.

Intra-patient comparison

The researchers compared previous prophylaxis to once-weekly emicizumab prophylaxis in 48 patients from arm D.

The model-based ABR for treated bleeds was 4.8 with prior prophylaxis and 1.5 with emicizumab. The median ABR for treated bleeds was 1.8 and 0.0, respectively.

Patients had a 68% reduction in treated bleeds with emicizumab (P<0.0001).

With prior prophylaxis, 39.6% of patients had 0 treated bleeds. With emicizumab, 54.2% of patients had 0 treated bleeds.

Safety

There were no serious adverse events (AEs) related to emicizumab, no anti-drug antibodies detected, and none of the patients on emicizumab developed de novo factor VIII inhibitors.

Injection-site reactions occurred in 25.3% of all patients (38/150), 25% of patients in arm A (9/36), 20% in arm B (7/35), 12.5% in arm C (2/16), and 31.7% in arm D (20/63).

An additional patient in arm D (who was included in the total) reported an “injection-site erythema,” not an “injection-site reaction.”

Upper respiratory tract infections occurred in 10.7% of all patients (n=16), 11.1% (n=4) of those in arm A, 11.4% (n=4) of those in arm B, 0% of those in arm C, and 12.7% (n=8) of those in arm D.

Other AEs occurring in at least 5% of patients were arthralgia (19%), nasopharyngitis (12%), headache (11%), and influenza (6%).

One patient in arm B discontinued emicizumab due to multiple mild AEs—insomnia, hair loss, nightmare, lethargy, depressed mood, headache, and pruritus.

Two patients were lost to follow-up—1 in arm A and 1 in arm C.

Photo from Business Wire

GLASGOW—Final results from the HAVEN 3 study suggest emicizumab prophylaxis can reduce bleeding in hemophilia A patients without factor VIII inhibitors.

Compared to patients who did not receive prophylaxis, those who received emicizumab prophylaxis had a 96% to 97% reduction in treated bleeds and a 94% to 95% reduction in all bleeds.

An intra-patient comparison showed a 68% reduction in treated bleeds with once-weekly emicizumab, compared to prior factor VIII prophylaxis.

“[Emicizumab] is the first medicine to show superior efficacy to prior factor VIII prophylaxis, the current standard of care therapy, as demonstrated by a statistically significant reduction in treated bleeds in the HAVEN 3 study intra-patient comparison,” said Johnny Mahlangu, MB BCh, of the University of the Witwatersrand in Johannesburg, South Africa.

Dr Mahlangu presented these results at the World Federation of Hemophilia (WFH) 2018 World Congress during the late-breaking abstract session on Monday. HAVEN 3 was sponsored by Hoffmann-La Roche.

Patients and treatment

In this phase 3 trial, researchers evaluated emicizumab in patients with hemophilia A without factor VIII inhibitors. The study included 152 patients who were 12 years of age or older and were previously treated with factor VIII therapy on-demand or as prophylaxis.

Patients previously treated with on-demand factor VIII were randomized in a 2:2:1 fashion to receive:

• Emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 1.5 mg/kg/wk until the end of study (arm A, n=36)
• Emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 3 mg/kg/2wks for at least 24 weeks (arm B, n=35)
• No prophylaxis, only episodic/on-demand factor VIII treatment (arm C, n=18).

Patients previously treated with factor VIII prophylaxis received emicizumab prophylaxis at 3 mg/kg/wk for 4 weeks, followed by 1.5 mg/kg/wk until the end of study (arm D, n=63).

Episodic treatment of breakthrough bleeds with factor VIII therapy was allowed per protocol.

Emicizumab vs no prophylaxis

The model-based (negative binomial regression model) annualized bleeding rate (ABR) for treated bleeds was 1.5 in arm A, 1.3 in arm B, and 38.2 in arm C. The median ABR for treated bleeds was 0 in arms A and B and 40.4 in arm C.

Compared to patients in arm C, those in arm A had a 96% (P<0.0001) reduction in treated bleeds, and those in arm B had a 97% (P<0.0001) reduction in treated bleeds.

None of the patients in arm C had 0 treated bleeds, compared to 55.6% of patients in arm A and 60% of patients in arm B.

The model-based ABR for all bleeds was 2.5 in arm A, 2.6 in arm B, and 47.6 in arm C.

Patients in arm A had a 95% reduction in all bleeds (P<0.0001), and patients in arm B had a 94% reduction in all bleeds (P<0.0001), compared to patients in arm C.

Fifty percent of patients in arm A had 0 total bleeds, as did 40% of patients in arm B and 0% of patients in arm C.

Intra-patient comparison

The researchers compared previous prophylaxis to once-weekly emicizumab prophylaxis in 48 patients from arm D.

The model-based ABR for treated bleeds was 4.8 with prior prophylaxis and 1.5 with emicizumab. The median ABR for treated bleeds was 1.8 and 0.0, respectively.

Patients had a 68% reduction in treated bleeds with emicizumab (P<0.0001).

With prior prophylaxis, 39.6% of patients had 0 treated bleeds. With emicizumab, 54.2% of patients had 0 treated bleeds.

Safety

There were no serious adverse events (AEs) related to emicizumab, no anti-drug antibodies detected, and none of the patients on emicizumab developed de novo factor VIII inhibitors.

Injection-site reactions occurred in 25.3% of all patients (38/150), 25% of patients in arm A (9/36), 20% in arm B (7/35), 12.5% in arm C (2/16), and 31.7% in arm D (20/63).

An additional patient in arm D (who was included in the total) reported an “injection-site erythema,” not an “injection-site reaction.”

Upper respiratory tract infections occurred in 10.7% of all patients (n=16), 11.1% (n=4) of those in arm A, 11.4% (n=4) of those in arm B, 0% of those in arm C, and 12.7% (n=8) of those in arm D.

Other AEs occurring in at least 5% of patients were arthralgia (19%), nasopharyngitis (12%), headache (11%), and influenza (6%).

One patient in arm B discontinued emicizumab due to multiple mild AEs—insomnia, hair loss, nightmare, lethargy, depressed mood, headache, and pruritus.

Two patients were lost to follow-up—1 in arm A and 1 in arm C.