Klinefelter syndrome 47,XXY

Klinefelter syndrome is a rare genetic condition in which a man has an extra X chromosome. (Males usually have one X and one Y chromosome.) Some of the other conditions associated with Klinefelter are hypothyroidism, infertility, testicular cancer, and an increased risk for male breast cancer.
Source: About.com Breast Cancer - Category: Cancer & Oncology Authors: Tags: health Source Type: news