After a trial of the OPDIVO cancer treatment of Five Prime's (FPRX) partner, Bristol Myers Squibb (BMY), showed disappointing results, Wells Fargo thinks that the nearly 9% decline in Five Prime's stock was overdone. The firm thinks that it's "premature" to determine that Merck's (MRK) Keytruda has overtaken OPDIVO. The firm believes that Five Prime's OPDIVO can redeem itself in upcoming studies, and it thinks that Five Prime's stock can advance if the actor-1 receptor is proven to be a worthwhile target ,whether or not OPDIVO is shown to be effective. The firm keeps an Outperform rating on Five Prime.