MIAMI – People with nonplaque psoriasis could soon have their day. Some patients with nail, inverse, and genital psoriasis, for example, fail to meet traditional criteria for moderate to severe disease and therefore do not meet label indications for treatment.
That could soon change if dermatologist Abrar A. Qureshi, MD, and rheumatologist-dermatologist Joseph F. Merola, MD, have their way, according to their dual presentation at the annual meeting of the Group for Research and Assessment of Psoriasis and Psoriatic Arthritis.
Dr. Joseph F. Merola
“What we’re trying to do really is go into redefining moderate to severe psoriasis. The current definition is moderate to severe plaque psoriasis,” said Dr. Qureshi, chief of dermatology at Rhode Island Hospital in Providence. “If you look at all the labels out there, it’s plaque disease.”
However, “psoriasis is poly phenotype,” Dr. Qureshi said. “This paradigm needs to change in the next few years to redefine what moderate to severe psoriasis is.” A patient with limited, nonplaque psoriasis on their elbows, one knee, or who presents only with perianal disease, for example, might not meet the traditional definition of moderate to severe psoriasis. Another patient might just have scalp disease or inverse psoriasis on a limited body area.
Currently, the Psoriasis Area and Severity Index (PASI), Physician Global Assessment (PGA) and Body Surface Area (BSA) assessments classify mild, moderate, and severe psoriasis, “with the majority of people out there in the world with mild psoriasis,” Dr. Qureshi said. A new measure called the Comprehensive Assessment of the Psoriasis Patient (CAPP) “captures more people with moderate to severe disease.”
CAPP includes a measure of plaque disease, palmoplantar, nail, scale, inverse, and genital psoriasis. “Where PASI fails, we hope the CAPP meets this unmet need,” said Dr. Merola, codirector of the Center for Skin and Related Musculoskeletal Diseases, a combined clinic at Brigham and Women’s Hospital in Boston. The two highest phenotypic scores are added to the plaque score for a final CAPP score. “It’s easy to use.”
A newly announced genital psoriasis component of CAPP measures any suprapubic, perineal, and genital involvement. Thickness, scale, and severity are included in CAPP, as well as secondary skin changes like fissuring or erosion. Then the score is equally weighted with the patient reported outcomes of pain and effect on intimacy rated on a simple visual analog scale.
Dr. Merola, Dr. Qureshi, and their colleagues collaborated on a study looking at the prevalence of nonplaque psoriasis among almost 4,000 patients (Clin Exp Dermatol. 2016;41:486-9).
“It surprised us to see such a high prevalence of inverse disease, almost 24%,” Dr. Merola said. “Many of these patients have two nonplaque phenotypes. It’s also important because it seems like there is an increased psoriatic arthritis risk.”
“The nail story and the scalp story have been out there a while, but looking at inverse disease there was a fairly high hazard ratio [2.07] for development of psoriatic arthritis.”
Proposing a polyphenotype psoriasis clinical trial
“I will end with a recommendation for a polyphenotype psoriasis clinical trial, to be really controversial,” Dr. Qureshi said. “We want to capture only the people who qualify as moderate to severe with the new measure and look at them before and after therapy.” He added participants would be “people out there in clinic who are currently not receiving treatment.”
During the Q&A, a meeting attendee asked if the investigators could recruit enough patients with nonplaque psoriasis. “We think it’s about 15%-23%,” Dr. Qureshi said. “The only type we cannot capture well is the palmoplantar phenotype because of its really low prevalence.”