** Shares of drugmaker Roivant Sciences ROIV.O rise 4.6% to $14.84 premarket
** Roivant and partner Priovant say their once-daily pill, brepocitinib, helped adults with dermatomyositis do better across multiple measures in a year-long late-stage study
** Dermatomyositis is a rare disease that weakens muscles and causes painful skin rashes
** In the 52-week trial, patients taking the 30mg dose showed better overall improvement than those on a placebo, starting as early as week four
** Safety was in line with earlier studies, cos say
** Roivant and Priovant say they plan to file for U.S. approval in the first half of 2026
** As of last close, ROIV stock was up 19.9% YTD
(Reporting by Padmanabhan Ananthan)
((Padmanabhan.Ananthan@thomsonreuters.com))