Study to Determine if the Flu Vaccine Increases the Risk of Muscle Damage in Participants Taking Drugs That Block Certain Proteins Made by Some Types of Immune System Cells

Inclusion Criteria: * Treatment with a checkpoint inhibitor (CPI) * Age greater than or equal to 18 years on date of first claim for a CPI * ICD-9 or ICD-10 code for a malignancy within 180 days prior to the first claim for any CPI, and * Greater than or equal to 180 days of continuous pharmaceutical and medical benefit enrollment in the database prior to the first claim for any CPI Exclusion Criteria: * Less than 18 years of age Other protocol defined inclusion/exclusion criteria could apply