Spanish Breast Cancer Research Group

This study is testing if a combination of two hormone therapy drugs (letrozole and abemaciclib) works as well as or better than standard chemotherapy when given before surgery for certain types of early-stage breast cancer. It involves about 200 women whose cancer is hormone-sens…

This study is for people with advanced HER2-positive breast cancer that has a specific gene change called PIK3CA and has worsened after previous treatments. It aims to see if a combination of targeted drugs (trastuzumab with alpelisib, plus fulvestrant for some) can control the c…

This study is collecting information to better understand breast cancer in relation to pregnancy. It will follow women who are diagnosed with breast cancer during pregnancy, become pregnant after a breast cancer diagnosis, or used fertility preservation before cancer treatment. T…