SELLAS Life Sciences Group stock is approaching key resistance levels. What's driving SLS to record levels? What Does SELLAS Life Sciences Do? SELLAS Life Sciences Group is a late-stage clinical biopharmaceutical company focused on developing novel therapeutics for a broad range of cancer indications. That matters because clinical-stage biotech stocks can re- rate quickly when investors believe the probability of future trial or regulatory success is improving. The company's pipeline includes galinpepimut-S ...