Lastly, the group of I.V. Litvinov reported that the HOP2 protein is also ectopically expressed in cutaneous T-cell lymphomas (CTCL), suggesting that HOP2 expression is not unique to breast, ovarian and fallopian tube cancers (Tsang et al., 2018). This evidence concerns the gene PSMC3IP and primary cutaneous T-cell non-Hodgkin lymphoma.