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Studies on the Abortion-Breast Cancer Link
Research Synthesis: Induced Abortion and Breast Cancer
| No. | Year | Reference | OR or RR (95% CI) | Statistically Significant | Positive or Negative Correlation |
|---|---|---|---|---|---|
| 1 | 1957 | M. Segi, I. Fukushima, S. Fujisaku, M. Kurihara, S. Saito, K. Asano, and M. Kamoi, “An Epidemiological Study on Cancer in Japan,” Japanese Journal of Cancer Research (GANN) 48 (Suppl.) (1957): 1-63. | 2.63 (1.85-3.75)* | Yes | Positive |
| 2 | 1968 | H. Watanabe and T. Hirayama, “Epidemiology and Clinical Aspects of Breast Cancer,” Nippon Rinsho 26 (1968): 1843-1849 (in Japanese). | 1.51 (0.91-2.53)* | No | Positive |
| 3 | 1978 | V.V. Dvoirin and A.B. Medvedev, “Role of Women’s Reproductive Status in the Development of Breast Cancer,” in Methods and Progress in Breast Cancer Epidemiology Research, by Tallin (Moscow: Oncology Science Center of the USSR Academy of Sciences, 1978), 53-63 (in Russian). | 1.71 (0.80-3.64)* | No | Positive |
| 4 | 1979 | B. Burany, “Gestational characteristics in women with breast cancer,” Jugosil Ginekol Opstet 19 (1979):237-247 (in Serbo-Croatian). | 0.50 (0.33-0.74)* | Yes | Negative |
| 5 | 1981 | M.C. Pike, B.E. Henderson, J.T. Casagrande, I. Rosario, and G.E. Gray, “Oral Contraceptive Use and Early Abortion as Risk Factors for Breast Cancer in Young Women,” British Journal of Cancer 43, no. 1 (1981): 72-76. | 2.37 (0.85-6.93)* | No | Positive |
