Sexual Orientation and Cancer Risk

Young people in sexual minorities are at higher risk of cancer because they engage in risky behavior more often, say researchers from City University of New York, Harvard, Boston’s Children’s Hospital, and San Diego State University.

The researchers analyzed data from 9,958 participants in the national Growing Up Today Study (1999-2010). The study participants were the children of the women in the Nurses’ Health Study II; those women were invited in 1996 to enroll their 9- to 14-year-old children. Of the participants, 84.5% reported being “completely” heterosexual, 12.1% were “mostly” heterosexual, 1.8% were lesbian or gay, and 1.6% were bisexual.

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The researchers measured responses about tobacco and alcohol, diet and physical activity, exposure to ultraviolet radiation, and sexually transmitted infections.

Compared with completely heterosexual women, lesbian, bisexual, and mostly heterosexual women more frequently engaged in multiple cancer-related risk behaviors. For instance, they were more likely to have smoked, to be overweight, and to have been physically inactive in the previous year. Bisexual and mostly heterosexual women were more likely to have had a sexually transmitted infection. Interestingly, heterosexual women were more likely to have used a tanning booth ≥ 10 times in the previous year.

Compared with heterosexual men, sexual-minority women were also more often engaged in risky behaviors. The differences between gay/bisexual men and heterosexual men were less marked, although gay men more often vomited to control their weight, compared with heterosexual men, and had a higher prevalence of STIs.

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The literature, the researchers note, tends to focus on “ever or never” behavior. They were mindful, they say, that exposure to a potential carcinogen usually must occur over time, and that the likelihood of cancer increases with exposure, which is why they focused on assessing frequent engagement in each cancer-related risk behavior, long term. Their findings indicated that sexual minorities, relative to heterosexuals, are at risk for cancer through multiple risk behaviors—“concerning,” they add, because the “additive or synergistic effect of another cancer-related risk behavior may provoke or exacerbate a determinant of cancer: chronic inflammation.”

Source:
Rosario M, Li F, Wypij D, et al. Am J Public Health. 2016;106(4):698-706.
doi: 10.2105/AJPH.2015.302977.