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The rates of recurrence were 27.1% in the reduced dosing frequency arm and 12% in the standard dosing frequency arm. These results were reported at the virtual annual congress of the European Association of Urology.
More patients in the reduced dosing frequency arm than in the standard dosing frequency arm had a shorter time to recurrence, which was the primary endpoint of the trial.
At 6 months, the rate of recurrence was 18% in the reduced frequency arm and 8% in the standard frequency arm. The gap widened further at both 12 months (24% and 11%, respectively) and 24 months (34% and 15%, respectively). The hazard ratio for time to recurrence was 0.403 in favor of the standard dosing frequency arm.
“The recommended dose and schedule of BCG consists of once-weekly installations during 6 weeks of induction, followed by 3 weeks of maintenance at 3, 6, and 12 months,” observed study investigator Marc-Oliver Grimm, MD, of Jena (Germany) University Hospital.
“BCG instillation is, however, frequently associated with adverse events, which may lead to discontinuation, and several attempts have been made to reduce symptom burden associated with BCG,” he added.
Dr. Grimm presented the recently published findings from NIMBUS (Eur Urol. 2020 May 20;S0302-2838[20]30334-1) alongside some new information from a post hoc analysis.
Trial details
NIMBUS was a randomized, unblinded study of 345 patients with high-grade NMIBC who were recruited over a prolonged period, Dr. Grimm said. The long accrual was caused by a shortage of BCG and meant that the statistical assumptions had to be revised to include fewer patients.
The trial was designed to compare induction consisting of three versus six weekly BCG instillations and maintenance consisting of two versus three weekly BCG instillations at 3, 6, and 12 months. The aim had been to show that a reduced dosing frequency of BCG – 9 rather than 15 instillations – was noninferior to the standard dosing frequency of BCG, Dr. Grimm said. However, that was not the case, and the trial had to be stopped prematurely. In October 2019, the study’s sponsor, the EAU Research Foundation, announced that the trial would end.
Despite its unexpected ending, the trial’s data now fill some knowledge gaps, as pointed out by the discussant for the trial, Peter Black, MD, of the University of British Columbia in Vancouver.
Previous studies, such as the SWOG 8507, EORTC 30962, and CUETO 98013 trials, had shown that maintenance treatment works, but the schedule matters, he said. Results have also shown that the duration of maintenance treatment is less important than the dose of BCG given.
“The NIMBUS trial now tells us that dosing frequency is critical,” Dr. Black said.
Not only did the NIMBUS trial alter the maintenance schedule, it also altered the induction course of BCG instillation.
“The dramatic difference in recurrence-free survival, especially with the large separation of K-M [Kaplan-Meier] curves early on, suggests that this change to induction has had a major impact on the outcomes,” Dr. Black observed.
Post hoc analysis
Dr. Grimm presented a post hoc analysis comparing the rates of recurrence in the NIMBUS trial with rates seen in the EORTC 30962 and CUETO 98013 trials. Dr. Black also compared NIMBUS results to results from the SWOG 8507 trial.
The analysis showed lower rates of recurrence in the standard dose frequency arm in the NIMBUS trial than in the EORTC and CUETO trials at both 12 months (11%, 25%, and 18%, respectively) and 24 months (15%, 32%, and 27%, respectively).
However, as Dr. Black pointed out, the SWOG trial had similar recurrence rates as the NIMBUS trial at 12 months (9% and 11%, respectively) and 24 months (19% and 15%, respectively).
Dr. Grimm suggested that the lower rates of recurrence in the standard dosing arm of NIMBUS versus the other trials might have been because 91% of patients in the NIMBUS trial having undergone repeat transurethral resection for bladder tumor before BCG instillation.
Dr. Black said while this might have had an effect, it was probably not the only answer. While it’s true that the other trials had not considered repeat transurethral resection for bladder tumor, there were other confounding factors that might have been important, from patient selection bias to the use of advanced cystoscopy technologies, he said.
“If we really want to discern differences between surgery and intravesical therapy, we need to focus on CIS [carcinoma in situ] patients. Although this has major implications on feasibility since the patient pool is smaller,” Dr. Black said.
“One final point I’d like to make is that we really need to use these trials to understand the biology of non–muscle invasive bladder cancer,” he said. ”We know that BCG induces a cellular response, and we can measure this, as well as cytokine response. We know that the response builds to a plateau over four to six doses of induction and over two to three doses of maintenance therapy. This is perhaps more rapid in patients with pre-existing BCG immune reactivity. But there is biological rationale for the current six-plus-three protocol, and I think the reduced dose frequency in the NIMBUS trial probably failed to achieve the same immune activation as the established protocol.”
“If we were faced with a BCG shortage, it is better to reduce dose or duration of therapy but not the frequency of dosing,” Dr. Black added.
The NIMBUS trial was sponsored by the EAU Research Foundation. Dr. Grimm disclosed ties to Novartis, Bristol-Myers Squibb, Pfizer, AstraZeneca, and many other pharmaceutical companies. Dr. Black had no conflicts of interests relevant to his comments.
SOURCE: Grimm M-O. EAU20. https://urosource.uroweb.org/resource-centre/EAU20V/212877/Abstract/
The rates of recurrence were 27.1% in the reduced dosing frequency arm and 12% in the standard dosing frequency arm. These results were reported at the virtual annual congress of the European Association of Urology.
More patients in the reduced dosing frequency arm than in the standard dosing frequency arm had a shorter time to recurrence, which was the primary endpoint of the trial.
At 6 months, the rate of recurrence was 18% in the reduced frequency arm and 8% in the standard frequency arm. The gap widened further at both 12 months (24% and 11%, respectively) and 24 months (34% and 15%, respectively). The hazard ratio for time to recurrence was 0.403 in favor of the standard dosing frequency arm.
“The recommended dose and schedule of BCG consists of once-weekly installations during 6 weeks of induction, followed by 3 weeks of maintenance at 3, 6, and 12 months,” observed study investigator Marc-Oliver Grimm, MD, of Jena (Germany) University Hospital.
“BCG instillation is, however, frequently associated with adverse events, which may lead to discontinuation, and several attempts have been made to reduce symptom burden associated with BCG,” he added.
Dr. Grimm presented the recently published findings from NIMBUS (Eur Urol. 2020 May 20;S0302-2838[20]30334-1) alongside some new information from a post hoc analysis.
Trial details
NIMBUS was a randomized, unblinded study of 345 patients with high-grade NMIBC who were recruited over a prolonged period, Dr. Grimm said. The long accrual was caused by a shortage of BCG and meant that the statistical assumptions had to be revised to include fewer patients.
The trial was designed to compare induction consisting of three versus six weekly BCG instillations and maintenance consisting of two versus three weekly BCG instillations at 3, 6, and 12 months. The aim had been to show that a reduced dosing frequency of BCG – 9 rather than 15 instillations – was noninferior to the standard dosing frequency of BCG, Dr. Grimm said. However, that was not the case, and the trial had to be stopped prematurely. In October 2019, the study’s sponsor, the EAU Research Foundation, announced that the trial would end.
Despite its unexpected ending, the trial’s data now fill some knowledge gaps, as pointed out by the discussant for the trial, Peter Black, MD, of the University of British Columbia in Vancouver.
Previous studies, such as the SWOG 8507, EORTC 30962, and CUETO 98013 trials, had shown that maintenance treatment works, but the schedule matters, he said. Results have also shown that the duration of maintenance treatment is less important than the dose of BCG given.
“The NIMBUS trial now tells us that dosing frequency is critical,” Dr. Black said.
Not only did the NIMBUS trial alter the maintenance schedule, it also altered the induction course of BCG instillation.
“The dramatic difference in recurrence-free survival, especially with the large separation of K-M [Kaplan-Meier] curves early on, suggests that this change to induction has had a major impact on the outcomes,” Dr. Black observed.
Post hoc analysis
Dr. Grimm presented a post hoc analysis comparing the rates of recurrence in the NIMBUS trial with rates seen in the EORTC 30962 and CUETO 98013 trials. Dr. Black also compared NIMBUS results to results from the SWOG 8507 trial.
The analysis showed lower rates of recurrence in the standard dose frequency arm in the NIMBUS trial than in the EORTC and CUETO trials at both 12 months (11%, 25%, and 18%, respectively) and 24 months (15%, 32%, and 27%, respectively).
However, as Dr. Black pointed out, the SWOG trial had similar recurrence rates as the NIMBUS trial at 12 months (9% and 11%, respectively) and 24 months (19% and 15%, respectively).
Dr. Grimm suggested that the lower rates of recurrence in the standard dosing arm of NIMBUS versus the other trials might have been because 91% of patients in the NIMBUS trial having undergone repeat transurethral resection for bladder tumor before BCG instillation.
Dr. Black said while this might have had an effect, it was probably not the only answer. While it’s true that the other trials had not considered repeat transurethral resection for bladder tumor, there were other confounding factors that might have been important, from patient selection bias to the use of advanced cystoscopy technologies, he said.
“If we really want to discern differences between surgery and intravesical therapy, we need to focus on CIS [carcinoma in situ] patients. Although this has major implications on feasibility since the patient pool is smaller,” Dr. Black said.
“One final point I’d like to make is that we really need to use these trials to understand the biology of non–muscle invasive bladder cancer,” he said. ”We know that BCG induces a cellular response, and we can measure this, as well as cytokine response. We know that the response builds to a plateau over four to six doses of induction and over two to three doses of maintenance therapy. This is perhaps more rapid in patients with pre-existing BCG immune reactivity. But there is biological rationale for the current six-plus-three protocol, and I think the reduced dose frequency in the NIMBUS trial probably failed to achieve the same immune activation as the established protocol.”
“If we were faced with a BCG shortage, it is better to reduce dose or duration of therapy but not the frequency of dosing,” Dr. Black added.
The NIMBUS trial was sponsored by the EAU Research Foundation. Dr. Grimm disclosed ties to Novartis, Bristol-Myers Squibb, Pfizer, AstraZeneca, and many other pharmaceutical companies. Dr. Black had no conflicts of interests relevant to his comments.
SOURCE: Grimm M-O. EAU20. https://urosource.uroweb.org/resource-centre/EAU20V/212877/Abstract/
The rates of recurrence were 27.1% in the reduced dosing frequency arm and 12% in the standard dosing frequency arm. These results were reported at the virtual annual congress of the European Association of Urology.
More patients in the reduced dosing frequency arm than in the standard dosing frequency arm had a shorter time to recurrence, which was the primary endpoint of the trial.
At 6 months, the rate of recurrence was 18% in the reduced frequency arm and 8% in the standard frequency arm. The gap widened further at both 12 months (24% and 11%, respectively) and 24 months (34% and 15%, respectively). The hazard ratio for time to recurrence was 0.403 in favor of the standard dosing frequency arm.
“The recommended dose and schedule of BCG consists of once-weekly installations during 6 weeks of induction, followed by 3 weeks of maintenance at 3, 6, and 12 months,” observed study investigator Marc-Oliver Grimm, MD, of Jena (Germany) University Hospital.
“BCG instillation is, however, frequently associated with adverse events, which may lead to discontinuation, and several attempts have been made to reduce symptom burden associated with BCG,” he added.
Dr. Grimm presented the recently published findings from NIMBUS (Eur Urol. 2020 May 20;S0302-2838[20]30334-1) alongside some new information from a post hoc analysis.
Trial details
NIMBUS was a randomized, unblinded study of 345 patients with high-grade NMIBC who were recruited over a prolonged period, Dr. Grimm said. The long accrual was caused by a shortage of BCG and meant that the statistical assumptions had to be revised to include fewer patients.
The trial was designed to compare induction consisting of three versus six weekly BCG instillations and maintenance consisting of two versus three weekly BCG instillations at 3, 6, and 12 months. The aim had been to show that a reduced dosing frequency of BCG – 9 rather than 15 instillations – was noninferior to the standard dosing frequency of BCG, Dr. Grimm said. However, that was not the case, and the trial had to be stopped prematurely. In October 2019, the study’s sponsor, the EAU Research Foundation, announced that the trial would end.
Despite its unexpected ending, the trial’s data now fill some knowledge gaps, as pointed out by the discussant for the trial, Peter Black, MD, of the University of British Columbia in Vancouver.
Previous studies, such as the SWOG 8507, EORTC 30962, and CUETO 98013 trials, had shown that maintenance treatment works, but the schedule matters, he said. Results have also shown that the duration of maintenance treatment is less important than the dose of BCG given.
“The NIMBUS trial now tells us that dosing frequency is critical,” Dr. Black said.
Not only did the NIMBUS trial alter the maintenance schedule, it also altered the induction course of BCG instillation.
“The dramatic difference in recurrence-free survival, especially with the large separation of K-M [Kaplan-Meier] curves early on, suggests that this change to induction has had a major impact on the outcomes,” Dr. Black observed.
Post hoc analysis
Dr. Grimm presented a post hoc analysis comparing the rates of recurrence in the NIMBUS trial with rates seen in the EORTC 30962 and CUETO 98013 trials. Dr. Black also compared NIMBUS results to results from the SWOG 8507 trial.
The analysis showed lower rates of recurrence in the standard dose frequency arm in the NIMBUS trial than in the EORTC and CUETO trials at both 12 months (11%, 25%, and 18%, respectively) and 24 months (15%, 32%, and 27%, respectively).
However, as Dr. Black pointed out, the SWOG trial had similar recurrence rates as the NIMBUS trial at 12 months (9% and 11%, respectively) and 24 months (19% and 15%, respectively).
Dr. Grimm suggested that the lower rates of recurrence in the standard dosing arm of NIMBUS versus the other trials might have been because 91% of patients in the NIMBUS trial having undergone repeat transurethral resection for bladder tumor before BCG instillation.
Dr. Black said while this might have had an effect, it was probably not the only answer. While it’s true that the other trials had not considered repeat transurethral resection for bladder tumor, there were other confounding factors that might have been important, from patient selection bias to the use of advanced cystoscopy technologies, he said.
“If we really want to discern differences between surgery and intravesical therapy, we need to focus on CIS [carcinoma in situ] patients. Although this has major implications on feasibility since the patient pool is smaller,” Dr. Black said.
“One final point I’d like to make is that we really need to use these trials to understand the biology of non–muscle invasive bladder cancer,” he said. ”We know that BCG induces a cellular response, and we can measure this, as well as cytokine response. We know that the response builds to a plateau over four to six doses of induction and over two to three doses of maintenance therapy. This is perhaps more rapid in patients with pre-existing BCG immune reactivity. But there is biological rationale for the current six-plus-three protocol, and I think the reduced dose frequency in the NIMBUS trial probably failed to achieve the same immune activation as the established protocol.”
“If we were faced with a BCG shortage, it is better to reduce dose or duration of therapy but not the frequency of dosing,” Dr. Black added.
The NIMBUS trial was sponsored by the EAU Research Foundation. Dr. Grimm disclosed ties to Novartis, Bristol-Myers Squibb, Pfizer, AstraZeneca, and many other pharmaceutical companies. Dr. Black had no conflicts of interests relevant to his comments.
SOURCE: Grimm M-O. EAU20. https://urosource.uroweb.org/resource-centre/EAU20V/212877/Abstract/
FROM EAU20