Although many case-control studies, based mostly on retrospective collection of data, have shown a statistically significant increase in breast cancer risk after induced abortion, especially before the first full-term pregnancy (FTP), this risk is denied by the National Cancer Institute and many researchers. The conclusions of ten recent studies based on prospective data collection are cited to buttress this position. These studies are examined in detail, with a focus on methodologic aspects. Collectively, these studies are found to embody many serious weaknesses and flaws, including cohort effects, substantial misclassification errors due to missing information in databases, inadequate follow-up times, inadequately controlled effects of confounding variables, and frank violations of the scientific method. These recent studies therefore do not invalidate the large body of previously published studies that established induced abortion as a risk factor for breast cancer.