IL6 and nasopharyngeal carcinoma: These results and the finding of IL-6 and IL-6Rα secretion patterns in NPC cell lines transduced with a vector of neogene without containing the IFN-γ gene resembled the baseline profiles exhibited by the nontransduced NPC cells (data not shown) exclude the possibility of transduction-mediated selection for high IL-6 producing or low IL-6Rα producing subpopulations.