Evidence linking abortion to breast cancer

The following is a review of the peer-reviewed literature on the subject of abortion and breast cancer:

List of studies showing that abortion increases the risk of breast cancer

 * 1) Journal of Epidemiology & Community Health, October 1996, 50, 481-96

List of studies showing no link between abortion and breast cancer

 * 1)  British Journal of Cancer 1982, 45, 327-31
 * 2) American Journal of Epidemiology 1983, 117, 35-45
 * 3) American Journal of Epidemiology 1987, 126, 831-41
 * 4) American Journal of Epidemiology 1988, 127, 981-9
 * 5)  British Medical Journal 1989, 299, 1430-2
 * 6)  British Journal of Cancer 1990, 62, 122-6
 * 7) International Journal of Cancer 1991, 48, 816-20
 * 8) International Journal of Cancer 1993, 53, 215-9
 * 9) Cancer Causes & Control 1995, 6, 75-82
 * 10)  International Journal of Cancer 1996, 65, 401-5
 * 11)  New England Journal of Medicine 1997, 336, 81
 * 12) Cancer Causes & Control 1997, 8, 93-108
 * 13) Cancer Causes & Control 1997, 8, 841-9
 * 14)  International Journal of Cancer 1998, 76, 182-8
 * 15) European Journal of Cancer 1999, 35, 1361-7
 * 16)  American Journal of Public Health 1999, 89, 1244-7
 * 17)  British Journal of Cancer 1999, 79, 1923-8
 * 18)  Epidemiology 2000, 11, 177-80
 * 19) Cancer Causes & Control 2000, 11, 777-81
 * 20)  Epidemiology 2000, 11, 76-80
 * 21)  International Journal of Cancer 2001, 92, 899-905
 * 22)  Cancer Epidemiology, Biomarkers & Prevention 2003, 12, 209-14
 * 23) Lancet 2004, 363, 1007–16
 * 24)  Journal of Epidemiology & Community Health 2005, 59, 283-7

List of studies showing that abortion decreases the risk of breast cancer

 * 1) Beral V, Bull D, Doll R, Peto R, Reeves G (2004). "Breast cancer and abortion: collaborative reanalysis of data from 53 epidemiological studies, including 83?000 women with breast cancer from 16 countries". Lancet 363 (9414): 1007–16. doi:10.1016/S0140-6736(04)15835-2. PMID 15051280.
 * 2) Brewster DH, Stockton DL, Dobbie R, Bull D, Beral V (2005). "Risk of breast cancer after miscarriage or induced abortion: a Scottish record linkage case-control study". Journal of epidemiology and community health 59 (4): 283–7. doi:10.1136/jech.2004.026393. PMC 1733063. PMID 15767381.
 * 3) Harris BM, Eklund G, Meirik O, Rutqvist LE, Wiklund K (1989). "Risk of cancer of the breast after legal abortion during first trimester: a Swedish register study". BMJ 299 (6713): 1430–2. doi:10.1136/bmj.299.6713.1430. PMC 1838310. PMID 2514825.
 * 4) Tumori. 2013 Jul-Aug;99(4):452-7. doi: 10.1700/1361.15093. Abortion and breast cancer: case-control study. Ilic M, Vlajinac H, Marinkovic J, Sipetic-Grujicic S.