Two studies reported ALDH1 expression as the worst prognostic factor for MSGTs (prognostic data not specified per histopathological type of MSGT), significantly associated with higher histopathological grade [20] or increased incidence of lymph node metastasis, advanced stage, increased recurrence, and higher number of deaths due to the disease [42]; however, significant prognostic correlation was not confirmed in four other studies including MEC, AdCC, or SCC cases (Table S5). The gene discussed is ALDH1A1; the disease is metastatic malignant neoplasm in the lymph nodes.