It’s the season for reevaluation as companies weed out programs that don’t offer much promise. At the head of the line is Sanofi SA’s once-potential myasthenia gravis blockbuster tolebrutinib. A partial clinical hold on the phase III study is part of the reasoning for stopping its development. But so is competition, the company said. Other companies eliminating development programs include Roche Holding AG, Gilead Sciences Inc., AB Science SA and Merck & Co. Inc.