[Observations of breast cancer during pregnancy and the lactating period].
D000328:Adult; D000367:Age Factors; D001943:Breast Neoplasms / Q000453:epidemiology*; D002285:Carcinoma, Intraductal, Noninfiltrating / Q000453:epidemiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007774:Lactation; D008875:Middle Aged; D009362:Neoplasm Metastasis; D011247:Pregnancy; D011248:Pregnancy Complications; D012728:Sex Chromatin