MUC5AC and hepatocellular carcinoma: In 1985, Goodman et al. proposed another classification encompassing three subtypes [3]: type 1 or collision tumour (separate and colliding foci of HCC and CC in the same liver); type 2 or transitional tumour (transitional area of intimate intermingling of the two components with actual transition of HCC elements to CC elements in the same tumour); and type 3 or fibrolamellar tumour (similar to fibrolamellar HCC, but with cells producing mucin).