ESR1-FL overall expression was assessed on the following collection of samples: ERα(+) BC primary tumors (n = 42); uninvolved breast tissue adjacent to ERα(+) primary tumors (n = 30); TNBC primary tumors (n = 42); uninvolved breast tissue adjacent to TNBC primary tumors (n = 21); metaplastic BC primary tumors (MpBC, n = 17)32,33. The gene discussed is ESR1; the disease is breast cancer.