- The rumor mill is abuzz: Comments from Merck KGaA (MKGAF.PK) regarding a 2-3% market share loss (transcript) for the MS treatment Rebif at the hands of Biogen's Tecfidera are fueling speculation that the German drug and materials company may heighten its focus on Tcelna, a treatment for Secondary Progressive MS being developed in conjunction with Opexa Therapeutics (OPXA).
- Shares of OPXA are now up 57% before the bell.
Tcelna speculation possibly driving Opexa gains
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