Something I do believe...

Some medical journals indicated that having an abortion or miscarriage does not increase a woman’s subsequent risk of developing breast cancer.The following message I got it from bcpinstitute.org (Breast Cancer Prevention Institute.org) has a different point of view on this studies. The below message I directly quoted it from bcpinstitute.org's website.

"If all women alive in the year 2004 were to reach the age of 85, then one in seven (14%) will have developed breast cancer. This is a number used to compare the impact of different risk factors associated with the likelihood of developing breast cancer. In general, most breast cancer risk factors, other than inherited genes and chemical or radiation injury to cells, are related to how much estrogen a woman is exposed to in her lifetime and how early she matures her breast lobules.

For example, women are exposed to elevations of estrogen levels with each menstrual cycle, so the more menstrual cycles a woman has, the higher her risk. This is why going through menarche at a very young age and menopause at a very old age will increase that woman’s breast cancer risk. Women are also exposed to high levels of estrogen in hormone replacement therapy and birth control pills, injections or patches. Many new drugs devised to prevent or treat breast cancer act by blocking estrogen receptor sites in breast cells (e.g. Tamoxifen), or cause our bodies to produce less estrogen (e.g. Arimidex). Women who have never been pregnant have approximately 75% of their breast lobules as Type 1, while women who have had a full-term pregnancy have 85% Type 3 lobules. This is why women who have children have a lower breast cancer risk than women who never had a full-term pregnancy. They have fewer places for cancers to start."
http://www.bcpinstitute.org/booklet4.htm