BRCA1 and cancer: Nevertheless, some degree of success has been achieved for diagnostic and predictive testing using BRCA1/2 mutations19 including identification of protein markers for cancer susceptibility using CA15‐320 and CA‐12521 from tissue, serum, blood, or saliva, and human epididymis (HE) protein from tissue.22 Similarly, mass spectrometry (MS)‐based analysis with two‐dimensional gel electrophoresis (2‐DE) and Affymetrix HG‐U133‐Plus‐2.0 Array have also been extensively used for early detection of different cancers such as lung, gastric, breast, and pancreatic cancers.23