NPC1 and nasopharyngeal carcinoma: Histone deacetylase inhibitor (SAHA) displayed higher toxicity than GCb+VPA in GC cell lines (Figure 5E), but SAHA was less toxic in NPC cell lines (Figure 5F), whereas GCb+VPA demonstrated minimal toxicity in both GC (Figure 5G) and NPC (Figure 5H) cell types.