We have found that introduction of TK expression vector driven by hTERT promoter (hTERTp/TK) could kill nasopharyngeal carcinoma cells, nasopharyngeal carcinoma stem cells, and nasopharyngeal tumor xenograft in nude mice without side effects on cultured normal cells and damaging mouse liver and kidney functions [17]. This evidence concerns the gene TKT and nasopharyngeal neoplasm.