SALL4 and OCT4 expressions in different stages of primary lung squamous cell carcinomas (SqCCs). In 90 SqCCs, 25 cases were pT1, 28 cases were pT2, and 37 cases were pT3/4 tumors. The expressions of SALL4 and OCT4 showed different patterns. The stronger SALL4 expression was found in all different stages of SqCCs. The stronger OCT4 expression was more frequently in pT3/4 SqCCs.