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Four years after Bristol Myers Squibb Co.’s (BMS) $1.85 billion investment in Nektar Therapeutics Inc., the pair’s collaboration has stumbled mightily with a phase III failure. A first analysis their melanoma study, PIVOT IO-001, showed it missed three primary endpoints. The study of interleukin-2-targeting NKTR-214 (bempegaldesleukin) combined with Opdivo (nivolumab) compared to Opdivo monotherapy as a first-line treatment for previously untreated, unresectable or metastatic melanoma did not meet the primary endpoints of progression-free survival and objective response rate.