TGFB1 and nasopharyngeal carcinoma: Similarly, gastric tissue-derived EBV-infected epithelial cell lines (GT38 and GT39) have been shown to be resistant to TGF-β1-mediated growth inhibition and apoptosis, as opposed to a TGF-β1-responsive EBV-negative gastric carcinoma cell line HSC-39 [75]; similar observations were also obtained in our laboratory with the EBV-positive NPC cell line, C666-1 (Yap L.F.; Dawson C.W. (University of Malaya, Kuala Lumpur, Malaysia) Personal observation, 2013).