News
Cancer Diagnosis Appears to Raise Suicide, Cardiovascular Risks
Major Finding: The rate of completed suicide was twice as high among adults with newly diagnosed cancer of any kind (0.36 per 1,000 person-years)...
WASHINGTON – U.S. patients diagnosed with lung cancer have had the highest suicide rates among patients diagnosed with any of the other most common, non-skin cancers, and they also had a substantially higher suicide risk, compared with the general U.S. adult population, based on U.S. national data collected during 1973-2013.
Although U.S. lung cancer patients showed a “steep” decline in suicide rates starting in about 1985 that then accelerated beginning in the mid-1990s, as recently as 2010-2013 the rate was roughly twice as high in lung cancer patients when compared with the general U.S. adult population. The rate of lung cancer patients taking their lives was also significantly above the suicide rates among patients with breast, colorectal, or prostate cancer, Mohamed Rahouma, MD, reported at an international conference of the American Thoracic Society.
Mitchel L. Zoler/Frontline Medical News
Dr. Mohamed Rahouma
However, he also stressed that identification of lung cancer patients at especially high suicide risk was important to allow “proper psychological assessment, support, and counseling to reduce [suicide] rates.”
Lung cancer patients with the highest rates included men, widowed individuals, septuagenarians, and Asians, his analysis showed. Standardized mortality ratios (SMRs) for suicide of these highest-risk subgroups were near or exceeding 10 times fold higher than the suicide rates of comparable demographic groups among the general U.S. adult population, according to Dr. Rahouma and his associates.
The overall SMR for all lung cancer patients during the entire four decades studied, compared with the overall U.S. adult population, was 4. Even during the period 2005-2013, when suicide among lung cancer patients had fallen to its lowest level, the SMR for this group was still more than 2.
The investigators used data collected by the U.S. Surveillance Epidemiology and End Results (SEER) Program cancer database maintained by the National Cancer Institute. For suicide rates among the general U.S. population they used data from the National Vital Statistics Reports produced by the Centers for Disease Control and Prevention. The SEER database included entries for more than 3.6 million U.S. cancer patients during 1973-2013, of whom 6,661 patents had committed suicide, an overall SMR of 1.6.
When the researchers drilled down the SMRs for individual cancer types they found that while the SMR for lung cancer patients throughout the period studied was just above 4, the SMRs for breast and colorectal cancer patients were both 1.4, and 1.2 for patients with prostate cancer. This analysis adjusted for patients’ age, sex, race, and year of diagnosis, Dr. Rahouma reported.
The time from diagnosis to suicide was also strikingly quicker among lung cancer patients, at an average of 8 months, compared with average delays from diagnosis to suicide of 40-60 months for patients with breast, colorectal, or prostate cancer. Dr. Rahouma’s time-trend analysis showed that the SMRs for these three other cancer types held more or less steady within the range of 1-2 throughout the 4 decades examined, and by 2010-2013 the three SMRs all were at or just above 1. Lung cancer was the only malignancy in this group that showed a wide range in SMR over time, with the peak some 30-40 years ago.
Among the lung cancer patient subgroups that showed the highest SMRs for suicide during the entire period studied, men had a SMR of 9, Asians had a SMR of nearly 14, those with a deceased spouse had a SMR for suicide of almost 12, and septuagenarians had a SMR of 12, said Dr. Rahouma. The impact of these risk factors was greatest during the first 8 months following lung cancer diagnosis. After 8 months, the strength of the risk factors diminished, with the SMRs within each risk category dropping by roughly half.
The highest-risk subgroups that the analysis identified should especially be referred for psychiatric support, Dr. Rahouma concluded. “These data will change our practice” at Cornell, he predicted.
Dr. Rahouma had no disclosures.
On Twitter @mitchelzoler