- The effects of durvalumab-tremelimumab on the developing human fetus are unknown. For this reason, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, for the duration of study participation, and 6 months after completion of durvalumab + tremelimumab administration or 90 days after the last dose of durvalumab monotherapy, whichever is the longer time period. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately. Men treated or enrolled on this protocol must also agree to use adequate contraception prior to the study, for the duration of study participation, and 6 months after completion of durvalumab + tremelimumab administration or 90 days after the last dose of durvalumab monotherapy, whichever is the longer time period.