Forty-nine elderly women aged ≥55 years who were diagnosed with invasive ductal breast carcinoma were included between May 2014 and May 2015 and evaluated for the presence of germline mutations in BRCA. FFPE tumor samples of 27 patients were analyzed for the presence of somatic mutations in PIK3CA. The median ages at the time of diagnosis and enrollment in the study were 61 years (55-80 years) and 64 years (56-87 years), respectively. The gene discussed is PIK3CA; the disease is invasive ductal breast carcinoma.