Moderna, Inc.

(NASDAQ:MRNA) stock is trading lower on Monday.

The COVID-19 vaccine maker and Merck & Co Inc.

(NYSE:MRK) reported five-year follow-up results from the Phase 2b KEYNOTE-942/mRNA-4157-P201 trial of individualized neoantigen therapy intismeran autogene (mRNA-4157/V940) plus KEYTRUDA for high-risk stage III/IV melanoma after complete surgical resection. • Moderna stock is under selling pressure.

What's driving MRNA stock lower?