The press release says there were 157 patients:
KEYNOTE-942 is an ongoing randomized, open-label Phase 2b trial that enrolled 157 patients with stage III/IV melanoma. Following complete surgical resection, patients were randomized to receive mRNA-4157/V940 (nine total doses of mRNA-4157) and KEYTRUDA (200 mg every three weeks up to 18 cycles [for approximately one year]) versus KEYTRUDA alone for approximately one year until disease recurrence or unacceptable toxicity. The primary endpoint is recurrence-free survival, and secondary endpoints include distant metastasis-free survival and safety.