Indeed they have. Herewith, a few:
When was abortion first suspected as a cause?
Dr. M. C. Pike, at the University of Southern California in l981, published the first serious scientific study that demonstrated a direct association of induced abortion with later breast cancer. He studied 163 women who developed breast cancer before age 33, and compared them with 272 controls. He showed that if a woman had aborted her first pregnancy, her chance for developing breast cancer was increased by a factor of 2.4 times. Pike MC, Henderson BE, Casagrande JT, Rosario I, Gray CE (1981) Brit. J. Cancer, 43:726.
Give me other definitive studies.
Certainly one of the definitive studies was by H. L. Howe. Her study was done in upstate New York using official statistics from the New York State Health Department. This was an excellent study by epidemiologic standards and was not subject to any kind of recall memory bias from people asked in questionnaires. It used only hard data. She investigated all the women in this area who developed breast cancer under age 40 and checked to see whether or not they had had abortions. The conclusion was that women who had aborted their first pregnancy had a 1.7 times increased risk of breast cancer. Those who had gone on to abort their second and/or third pregnancy had a 4.0 times increased risk. Howe HL, Senie RT, Bzduch H, Herzfeld P (1989) et al., Int. J. Epidemiol. 18:3004.
Another was in Washington State: Few studies on this issue receive media attention. This went worldwide and broke the defacto embargo on reporting the abortionbreast cancer link. Janet Daling did a very professional study that could not be discounted. It found:
- An induced abortion raises a woman’s chance of getting breast cancer before age 45 by 50%. If done before age 18, it increases 150%; if after age 30, it’s up 110%.
- A woman with a family member with breast cancer who had her first abortion after 30 years increased her risk 270%.
- All 12 women in the study with a family history of breast cancer, who aborted before age 18 — all 12 — got breast cancer before age 45. J. Daling, Risk of Breast Cancer Among Young Women, J. Nat. Ca. Inst., Vol. 86, No. 21, 11/2/94, pg. 1584
Other studies done since then include: Greece: An overall increased risk of 51% was reported in women who had abortions, compared to those who did not. It involved 850 patients in Athens. L. Lipworth, Int. J. of Cancer, April ’95 U.S.A.:
A statistically significant increased risk of 23% of breast cancer was shown to be attributable to induced abortion. For women over 60 years, the risk was 80%. P. Newcomb et al., Preg. Termination & Risk of Breast Cancer, JAMA 1/24/96, Vol. 275, No. 4, pg. 283
For a thorough explanation of the Newcomb study above, see Natl. RTL News, 2/6/96, by J. Brind. Paris: "Having at least two abortions if associated with an increased breast cancer risk" of 2.1 times. N. Andrieu, Role of Genetic & Repro. Factors in Br. Ca., Genetic Spidem. 11 (3): 285, 1994
There are, in addition, many competent studies done in the last 20 years which also confirm this linkage. See: Before You Choose, The Link Between Abortion & Breast Cancer; And: Legalized Abortion and the Sudden Increase of Breast Cancer, both by Scott Somerville, P.O. Box 159, Paeonian Springs, VA 22129.
These are comprehensive analyses citing 74 studies.
Source: Why Can't We Love Them Both? by Doctor and Mrs. J. C. Willke