What is TNBC
Estrogen and Progesterone receptors are normal proteins that exist on the surface of all breast cells. Some breast cancers maintain their ability to make the receptors and some cancers loose that ability. If the cancer does not express those receptors on the surface of its cells and has therefore lost the ability to make those receptors it is Estrogen and Progesterone receptor negative (ER, PR negative).
The association between BRCA1 mutations and triple negative breast cancers has led to research looking for a genetic predisposition to develop these types of cancers. Studies have identified specific locations within genes that appear to be abnormal in a higher proportion of cases than in other types of breast cancer. However, other than the BRCA1 gene, a specific gene causing this type of cancer has not been identified. It is likely that a combination of genetic factors located in specific locations within the genome interactively play a role in the development of TNBC. Genetics is an active field of investigation in TNBC.
It is true that Triple Negative Breast Cancer (TNBC) affects young patients, may have a slightly more aggressive behavior than other types of breast cancer and has no option for hormonal manipulation. You may read many gloom and doom posts and publications about the disease.