A diagnosis of cancer in adolescence occurs at a critical time of social and interpersonal development. Adolescents are encountering rapid physical growth, hormonal changes, and a shift from dependence on parents with associated reliance upon close peer and dating relationships. These close relationships often involve increased levels of intimacy and sexuality, and it is in the context of these relationships that adolescents are developing important competencies for later relationships in their adult years. A diagnosis of cancer in adolescence is likely to impact close relationships, although...