Trends in Incidence Rates of Invasive Lobular and Ductal Breast Carcinoma.

Evaluates trends in invasive lobular and ductal breast carcinoma incidence rates from 1987 through 1999, a period in which the use of combined estrogen and progestin hormone replacement therapy (CHRT) increased in the United States. Design, setting, population, main outcome measures, and results; Conclusion that ductal carcinoma rates remained constant, but lobular carcinoma rates increased.