http://www.bcpinstitute.org/booklet4.htm#maturity
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Breast Maturity & Breast Cancer Risk
Another aspect of breast development affecting breast cancer risk is the maturation of breast lobules from Type 1 lobules to Type 4 lobules.
Not only do these lobules look different anatomically, but they grow differently. For example, Type 1 and 2 lobules copy their DNA faster than Type 3 lobules. The faster DNA is copied, the higher the risk of mutations or cancer cells forming.
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Actual photomicrographs of human breast lobules:
http://www.bcpinstitute.org/images/lobule1.jpg
http://www.bcpinstitute.org/images/lobule3.jpg
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The principle of breast cancer risk relating to lobule maturity can explain other well-documented breast cancer risks as well.
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In relation to pregnancy:
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If it ends before 32 weeks, by very premature birth or induced abortion, she will have increased risk as she will not get the benefit of full breast maturation, but instead be left with more places for breast cancer to start. Spontaneous abortions in the first trimester do not increase breast cancer risk because they are associated with low estrogen levels.
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Article worth looking at.
