COL1A1 and ovarian cancer: Based on expression of 21 CAF‐associated markers, we defined four subtypes of CAFs in ovarian cancer as follows: myofibroblast CAFs (myCAFs, 0: SMA+, 1: FAP+, 2: COL1A1+) and antigen‐presenting CAFs (apCAFs, 3: CD74+/HLA‐DRA+; Figure S4A,B, Supporting Information).