A Study to Evaluate The Efficacy And Safety Of RO7198457 In Combination With Pembrolizumab Versus Pembrolizumab Alone In Participants With Previously Untreated Advanced Melanoma.

A Study in Participants Previously Enrolled in a Genentech− and/or F. Hoffmann-La Roche Ltd-Sponsored Atezolizumab Study (IMbrella A)

A Study of RO7198457 (Personalized Cancer Vaccine [PCV]) as a Single Agent and in Combination With Atezolizumab in Participants With Locally Advanced or Metastatic Tumors