It's more than just breast and ovarian cancer!
From 101 Reasons to Breastfeed Your Child
http://www.promom.org/101/4. Not breastfeeding increases mother's risk of breast cancer
Many studies have shown that women who breastfeed have lower risks of developing breast cancer. Recently, data from 47 studies in 30 countries was re-examined. The study group concluded that the incidence of breast cancer in developed countries could be reduced by more than half if women had the number of births and lifetime duration of breastfeeding that have been common in developing countries until recently. According to the analysis, breastfeeding could account for almost two-thirds of this estimated reduction in breast cancer incidence.
Jernstorm, H et al "Breast-feeding and the risk of breast cancer in BRCA1 and BRCA2 mutation carriers." J Natl Cancer Inst. 2004;96:1094-1098
Lee, SY et al "Effect of lifetime lactation on breast cancer risk: a Korean women's cohort study." Int J Cancer. 2003;105:390-393
Collaborative Group on Hormonal Factors in Breast Cancer (2002). "Breast cancer and breastfeeding: collaborative reanalysis of individual data from 47 epidemiological studies in 30 countries, including 50,302 women with breast cancer and 96,973 women without the disease." Lancet 360: 187-95
Zheng et al, "Lactation Reduces Breast Cancer Risk in Shandong Province, China" Am. J. Epidemiol. Dec. 2000, 152 (12): 1129
Newcomb PA, Storer BE, Longnecker MP, et al. "Lactation and a reduced risk of premenopausal breast cancer." N Engl J Med. 1994;330:81-87
6. Formula feeding increases baby girls' risk of developing breast cancer in later life
Women who were formula-fed as infants have higher rates of breast cancer as adults. For both premenopausal and postmenopausal breast cancer, women who were breastfed as children, even if only for a short time, had a 25% lower risk of developing breast cancer than women who were bottle-fed as infants.
Freudenheim, J. et al. 1994 "Exposure to breast milk in infancy and the risk of breast cancer". Epidemiology 5:324-331
13. Not breastfeeding increases mother's risk of developing ovarian cancerBased on the research, breastfeeding for a total of 12 to 24 months can reduce your risk of ovarian cancer by about one-third.
Hartage et al, "Rates and risks of ovarian cancer in subgroups of white women in the United States." Obstet Gynecol 1994 Nov; 84(5): 760-764
Rosenblatt KA, Thomas DB, "Lactation and the risk of Epithelial ovarian cancer". Int J Epidemiol. 1993;22:192-197
Gwinn ML, "Pregnancy, breastfeeding and oral contraceptives and the risk of Epithelial ovarian cancer." J. Clin. Epidemiol. 1990; 43:559-568
22. Not breastfeeding increases mother's risk of developing endometrial cancer
A World Health Organization study has shown that the longer a woman breastfeeds, the less likely she is to get endometrial cancer.
Rosenblatt, KA et al "Prolonged lactation and endometrial cancer" Int. J. Epidemiol. 1995; 24:499-503
30. Formula fed babies have a higher risk of developing certain childhood cancers
In a study done by researchers at the University of Minnesota it was found that babies who were breast fed for at least one month had a 21% less chance of getting leukemia than formula fed babies. The risk was 30% for children breast fed for 6 months.
Shu X-O, et al. "Breastfeeding and the risk of childhood acute leukemia". J Natl Cancer Inst 1999; 91: 1765-72
32. Breastfeeding decreases child's chances of contracting Hodgkins disease
Hodgkins disease is a type of lymphoma, or cancer of the lymph system. It can develop in children, although it is less likely to do so in children who were breastfed as infants.
"An Exploratory Study of Environmental and Medical Factors Potentially Related to Childhood Cancer." Medical & Pediatric Oncology, 1991; 19(2):115-21
