Cancer of the breast in twin sisters.
D000368:Aged; D001943:Breast Neoplasms / Q000235:genetics*; D002285:Carcinoma, Intraductal, Noninfiltrating / Q000235:genetics*; D002869:Chromosome Aberrations; D004200:Diseases in Twins; D005260:Female; D006801:Humans; D007621:Karyotyping