In the study from 2015, Wu et al. investigated the effects of the derivative of meta-tetra(hydroxyphenyl) chlorine (mTHPC) contained in pegylated liposomes as a photosensitizer on the expression of the MDR1 gene and P-gp in human nasopharyngeal carcinoma (NPC) cells. Here, ABCB1 is linked to nasopharyngeal carcinoma.