The main characteristics of the included studies are summarized in Table 1, where the following information was recorded: first author’s surname; year of publication; country of origin; type of cancer; follow-up period (in months); total number of patients; detection assay for HOTAIR expression; HR and the corresponding 95% CI for overall survival (OS), recurrence-free survival (RFS), disease-free survival (DFS), progression-free survival (PFS), metastasis-free survival (MFS); survival data extraction method; and specimen type. The gene discussed is HOTAIR; the disease is cancer.