Specific antibody detection of protein lysates from the NPC cell lines showed that ROR1 was an approximately 130 kDa protein expressed at higher levels in four of the NPC cell lines (5–8F, S18, S26 and CNE2) than in the NP69 cell line, in which the ROR1 protein was barely detected. Here, ROR1 is linked to nasopharyngeal carcinoma.