Serious mental illness and cancer: A call to action for equitable care.

Cancer advances are not distributed equitably among many segments of the population. Specifically, individuals with serious mental illness (SMI) face compounded disparities in cancer detection, treatment, and survival. SMI, characterized by conditions such as schizophrenia, bipolar disorder, and severe major depression, is associated with significant functional impairment and a two-to-three-decade reduction in life expectancy. Patients with SMI encounter unique challenges when navigating cancer care, including fragmented care pathways, less access to cancer therapeutics, limited psychosocial support, stigma, heightened vulnerability to diagnostic overshadowing where symptoms are attributed to their psychiatric rather than a medical or oncologic condition, and underrepresentation in therapeutic clinical trials. This review explores the intersection of SMI and cancer care starting with the conceptual background and its importance related to cancer outcomes and the delivery of ethical care to highlight unmet needs and a multitude of barriers. The paper proposes practical recommendations to improve cancer care for individuals with SMI who develop cancer including adopting the collaborative care model, enhancing psychosocial and psychiatric integration in oncology settings, and addressing biases inherent in clinician training. Interventions targeting individual, interpersonal, health system, and policy levels are essential to comprehensively mitigating disparities and developing durable cancer delivery strategies. Equitable cancer care for patients with SMI is both a moral imperative and a cornerstone of advancing social justice in oncology. Thus, there is a critical need to prioritize the translation of research advances, to close the gap in cancer outcomes and mortality, and to improve patient outcomes and wellbeing.