TERF1 and squamous cell lung carcinoma: Alternately, TERF1 (an homologue of TERF2 present in the shelterin complex) and TERF2 expression levels were directly related to survival in lung adenocarcinoma (TERF2, disease free survival; P = 0.0097) and lung squamous cell carcinoma (TERF1, overall survival; P = 0.0065) (Table 1).