MUC5AC and neoplasm: Consistent with this, increased tumor differentiation and increased mucin levels (as detected by Alcian-blue/PAS staining) were observed within tumor sections of RXC004-treated tumors, with intermediate effects at 1.5 mg/kg once daily and stronger effects at 5 mg/kg once daily (Fig. 3D; Supplementary Fig. S4A and S4B).