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A handful of cancer cases reported among treatment recipients overshadowed efficacy results analysts described as “best-in-disease” and sent shares down more than 30%.

Medicaid work requirements, fast-tracked funding for experimental Ebola vaccines, and more health news from Morning Rounds

At the year’s biggest cancer meeting, a high-stakes clash between two popular drug classes erupted, and scientists made headway against a once-insurmountable foe.