ERBB2 and endometrial carcinoma: In the context of endometrial carcinoma, CTSV expression has been shown to be positively correlated with several proteins involved in the regulation of cell cycle and proliferation, including MYB proto-oncogene like 2 (MYBL2), p21/WAF, cyclin B1, Ki-67 and human epidermal growth factor receptor 2 (HER2) (Skrzypczak et al., 2012).