Suicide Risk among Incident Cases of Cancer in the Swiss Canton of Vaud

Abstract

Data collected by the Cancer Registry of the Canton of Vaud, Switzerland, wer used to estimate the risk of suicide for patients diagnosed with cancer. Among 24,166 cases of invasive neoplasms other than nonmelanomatous skin cancer reported between 1976 and 1987 and followed through integrated active follow-up to the end of 1987, for a total of 57,164 person years at risk, there were 55 registered suicides vs. 21.3 expected (standardized mortality ratio, SMR = 2.6; 95% confidence interval, Cl = 2.0-3.4). The ratio was slightly, but not significantly higher for males (SMR = 2.8) than for females (SMR = 2.2) and comparable across subsequent age groups. The risk of suicide was high during the 1st year after notification (SMR = 3.9) and decreased to 2.2 between 1 and 5 years and to 1.5 over 5 years. This study suggests that the risk of suicide after a diagnosis of cancer may be greater than previously estimated from cancer registry data in Finland, Sweden, and Connecticut (USA), at least in this population of Central Europe with high overall suicide rates.

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