Antidepressant therapy in cancer patients: initiation and factors associated with treatment

PurposeWe assessed the impact of a cancer diagnosis and its timing on antidepressant initiation. We also examined patterns of, and factors associated with, new antidepressant treatment in cancer patients. MethodsWe followed 61067 antidepressant-naive Australian Government Department of Veterans' Affairs clients. We used multivariable Cox proportional hazards models with time-varying covariates to compare antidepressant initiation in clients with and without cancer and to assess how initiation varies with time from diagnosis, adjusting for sociodemographic characteristics, health service use and co-morbidities. Results17.2% (995/5795) of cancer patients initiated antidepressants and, on average, was more likely to initiate treatment than non-cancer controls with similar characteristics (initiation rate 9/100person-years, 95% confidence interval: 8.5-9.6 vs 6.6/100person-years, 95% confidence interval: 6.5-6.7). The peak initiation period was 12weeks before and 16weeks after diagnosis; cancer patients were 42% more likely to commence therapy than non-cancer patients (adjusted hazard ratio=1.4, 1.2 to 1.7). Cancer patients with co-morbid disease, dispensed opioids, corticosteroids or anxiolytics and to whom death was approaching were more likely to initiate treatment. Median duration of antidepressant therapy was 16weeks. ConclusionNew antidepressant treatment is more common in cancer populations than in cancer-free populations. Treatment was most commonly initiated around diagnosis time, a period when cancer drug treatments also commence. The timing of peak antidepressant uptake suggests treatment may be for short-term adjustment reactions, better managed without drugs. Durations of treatment are shorter than recommended for depression. (c) Commonwealth of Australia 2015.