KLK5 and head and neck neoplasm: Although in this study we focused on protein-coding genes, we noted top two highly up regulated non-coding transcripts in KLK6 high group samples, i.e., CTB-147C22.8 and CTB147C22, which were reported to be co-expressed with kallikrein genes KLK5, KLK6, and KLK7 in HPV16+ head and neck tumors [37].