A study conducted at the Research Institute of the McGill University Health Centre (RI-MUHC) suggests screening breast cancer patients for the prolactin receptor could improve the prognosis for patients and may help them avoid unnecessary and invasive treatments. Using a database of 580 women with triple negative breast cancer (TNBC), the researchers found that survival was prolonged in patients who expressed the prolactin receptor and that prolactin hormone was able to reduce the aggressive behavior of cancerous cells. It does so by decreasing their ability to divide and form new tumors.