Only a limited, non-significant association was observed between the CK7 and MUC5AC expression by tumour cells (p=0.16, Fisher’s exact test), while a significant association was found between MUC5AC and MUC6 expression (p=0.003), with all but one MUC6-positive cancers also showing MUC5AC reactivity. This evidence concerns the gene MUC5AC and cancer.