China (2013)—In late 2013, a meta-analysis of 36 Chinese studies found a significant association between IAs and breast cancer (OR = 1.44, 95% CI 1.29–1.59,
P < 0.001). Thus, the risk was increased 44% with one IA. These researchers also found evidence of a dose–response risk. At least two abortions increased the risk 76% and “at least at three” IAs increased the risk 89% (both results were highly significant,
P < 0.001) (
Huang et al. 2013).
Iran (2011)—As has been the case with China and India, more recent data from Iran clearly affirms the ABC link. In 2011, Iranian researchers concluded, “Nulliparity, late age at first birth and abortion were the most important reproductive factors associated with breast cancer risk” (Hajian-Tilaki and Kaveh-Ahangar
2011). Incredibly, Muslim women having five or more babies reduced their risk of breast cancer by 91 percent. Each “additional parity” (baby) was found to reduce the risk by 50 percent.
Japan (1957)—Historically, a seminal 1957 report from Japanese researchers found a relationship between abortion and breast cancer (Segi et al.
1957).
Russia (1989)—An epidemiological study in the former USSR has likewise found a significant association between abortion rates and incidence of breast (and cervical) cancer (Remennick
1989).
Sri Lanka (2010)—Breast cancer is the “commonest malignancy among women in the world as well as in Sri Lanka.” The incidence there has more than doubled from 4.6 per 100,000 women in 1985 to 9.8 in 2005. A case–control study conducted by researchers at the University of Colombo (Sri Lanka) examined 18 potential risk factors. Upon adjustment with multiple regression modeling, only the “controversial risk factor,” “having an abortion” in the past (OR, 3.42; 95% CI, 1.75–6.66), and passive smoking (OR 2.90), significantly increased the risk (De Silva et al.
2010). Again, a family history of breast cancer (see Kamath et al.
2013) was of borderline significance in the univariate analysis, and not related to risk after adjustment. Breast-feeding significantly lowered the risk of breast cancer in a dose–response manner (De Silva et al.
2010).