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A Stanford Medicine study identified an often-overlooked period of vulnerability for cancer survivors: Mental health disorders identified two to five years after a cancer diagnosis were associated with a 119% higher rate of death from cancer compared with patients without documented mental disorders during the same period.

Published in the Journal of the National Cancer Institute, the study analyzed data from 22,281 UK Biobank participants diagnosed with cancer over a median follow-up of more than five years. Researchers examined how the timing of mental health diagnoses related to cancer-specific survival.

The strongest association appeared two to five years after cancer diagnosis, a pattern seen across major cancer types, including breast, prostate, lung and lymphoma, with colorectal cancer showing a similar rate in the first year.

The findings do not establish that mental illness causes cancer progression or explain how cancer may contribute to mental disorders. Instead, mental health diagnoses may help identify patients experiencing psychological distress, treatment complications, barriers to care or other challenges associated with poorer survival. Gaps in ongoing support could be one contributor, the researchers say.

The study underscores the need to make routine mental health screening and comprehensive support part of cancer care well into survivorship.

, chair of epidemiology and population health and associate director for population sciences at the Stanford Cancer Institute, speak about the findings and what they could mean for patients.

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