Solid tumours included five female unilateral estrogen‐receptor positive breast cancers (age, 28–44 years), one dermatofibrosarcoma protuberans of the breast (age 29), one neuroendocrine tumor (age 48), one pancreatic cancer (died age 48), one pelvic mass (possible germ‐cell tumor at age 11), and one prostate cancer (age 52). This evidence concerns the gene ESR1 and breast cancer.