Background: The increasing number of long-term cancer survivors over the past few decades poses the challenge of mental health care needs. However, little is known about risks of mood disorders in long-term cancer survivors.
Methods: Long-term survivors (≥5 years) of adult cancers (LSAC) (n = 190,748) newly diagnosed between January 1, 2000 and December 31, 2007 were matched with one control. The primary outcome was diagnosis of mood disorders requiring psychotropics. Cumulative incidences and sub-hazard ratios (SHR) were calculated and multivariate analyses were conducted after accounting for mortality.
Results: The mood disorder risk was significantly higher in the LSAC cohort than in the control cohort (adjusted SHR = 1.16, 95% confidence interval [CI] = 1.13-1.18, P < 0.001). Patients with certain cancer types were at increased risk, particularly in the first 2 years after diagnosis. However, patients with head and neck cancers or esophageal cancers had a higher risk after the 5-year follow-up period. Multivariate analysis indicated that being female, aged 40-59 years, with more than two primary cancers, receiving two or more treatment modalities, having CCI scores higher than 3, a higher urbanization level, and lower monthly income were independently associated with an increased risk of mood disorders.
Limitations: Some potential confounders such as lifestyle factors were not available in the study.
Conclusion: These findings call for increased mental health awareness not only in the early years after the cancer diagnosis, but also during long-term follow-up for certain cancer subtypes.
Keywords: Adult cancer survivor; Cohort study; Depression; Mood disorder; Psychotropics.
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