Because TROP2 is involved in various malignant tumor processes including cancer proliferation, migration, invasion, and metastasis and TROP2 overexpression is associated with worse patient survival in several solid malignant tumors, TROP2 has attracted attention as a potential target for cancer therapy [9,12,13,14,15,16,17,18,19,20]. The gene discussed is TACSTD2; the disease is cancer.