Annika Kim Constantino

Key Points An experimental personalized cancer vaccine from Merck and Moderna showed positive initial results in its first-ever late-stage trial.

The combination regimen significantly extended the time patients lived without their melanoma returning, compared with Keytruda alone.

CNBC's Annika Kim Constantino reports on Moderna after its experimental skin cancer vaccine with Merck showed success in a late-stage trial.

CNBC's Annika Kim Constantino reports on the increase in Moderna and Merck's share prices following the success of late stage trials of cancer vaccines.

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The S&P 500 rose on Wednesday as bond yields fell following the Treasury Department's announcement of an increased buyback operation for longer-term debt.

For patients already doing well on Biktarvy, the rationale for switching is more about expanding treatment choices, he said.

Over the past year, the administration has reached drug pricing deals with 17 pharmaceutical companies, including Pfizer, Eli Lilly and Novo Nordisk, as part of its “most favored nation” policy.

Nearly a dozen drugmakers will voluntarily sell their medications at lower prices under deals announced by President Donald Trump.