Glycopyrronium bromide cream
Following on the heels of a recently published dose-ranging study (Br J Dermatol. 2020 Jan;182[1]:229-231), Dr. Abels presented the 4-week outcomes of a phase 3a, double-blind, randomized, five-country trial of once-daily 1% GPB cream or placebo in 171 patients with moderate or severe primary axillary hyperhidrosis. A phase 3b, open-label, 72-week, long-term safety trial is ongoing in 516 patients.
The primary endpoint of the 4-week trial was the reduction in gravimetric sweat production from day 1 to day 29. A reduction of 50% or more was documented in 57.5% of the patients on GBP and 34.5% of controls. A 75% or greater reduction occurred in 32.2% of the active-treatment group and 16.7% of those on placebo. And a decrease of at least 90% was seen in 23% of patients on topical GBP, compared with 9.5% of controls. All these between-group differences were significant.
The FDA now requires a quality of life measurement as a coprimary endpoint in phase 3 hyperhidrosis studies, and the phase 3 GBP trial also served as the successful validation study for a new patient-reported quality of life instrument designed specifically for this purpose. The new tool, known as the Hyperhydrosis Quality of Life questionnaire (HidroQol), proved much more sensitive than the HDSS or DLQI for evaluating clinical improvement in response to treatment (Br J Dermatol. 2020 Jun 8. doi: 10.1111/bjd.19300).
Initial results from the long-term phase 3b safety study should be available this fall on the first 100 patients followed on topical GBP for 1 year and for 300 followed for 6 months, Dr. Abels said.
Dr. Fujimoto reported serving as a paid consultant to and speaker for Kaken Pharmaceutical, which is developing SBP gel with Brickell Biotech. Dr. Abels is an employee of the company that is developing GPB cream.