PIK3CA and prostate adenocarcinoma: Two other recurrent epitopes, LSKITEQEK and STRDPLSKI, were identified 168 times for HLA-A*30:01 and HLA-B*15:17, respectively, with both originating from the same oncogenic mutation in PIK3CA (E542K substitutions) [68], and were found exclusively in breast carcinoma, cervical squamous cell carcinoma, and prostate adenocarcinoma patients.