GYPC and nasopharyngeal carcinoma: The number of apoptotic cells was reduced from 11.62 ± 6.25% to 8.24 ± 1.12% and 3.69 ± 0.71% for NPC-CM and GPC-CM, respectively, after 12 h of preincubation with CM (total protein of 20 μg/mL) (Figure 2b).