CD40LG and lip and oral cavity carcinoma: Oral cancers and control (0.0003) were statistically significant, and the mean serum IgM values in oral precancers were 125.60 ( ±  74.92) mg/dL, oral cancers were 59.80 ( ±  41.62) mg/dL, and controls were 62.53 ( ±  28.58) mg/dL.