Changes of TGFbeta1 and TGFbetaRII expression in esophageal precancerous and cancerous lesions: a study of a high-risk population in Henan, northern China.

Changes of TGFbeta1 and TGFbetaRII expression in esophageal precancerous and cancerous lesions: a study of a high-risk population in Henan, northern China.