PLAT and nasopharyngeal carcinoma: At this concentration of DOX, the level of BALF3 mRNA was up to approximately 30.2% of the maximal BALF3 level in the EBV-positive NPC cell line, NA cells, treated with 40 ng/ml TPA and 3 mM SB for 36 h, as determined by a quantitative reverse transcription-PCR analysis (data not shown).