1. intratumoral HGF-positive when ≥50% of the tumour cells positively stained for HGF 2. Staining intensity was classified as grade 0 (no staining), grade 1 (weak staining), grade 2 (moderately strong staining), grade 3 (very strong staining), or grade 4 (extremely strong staining). The intratumoral c-MET-positive when the intensity of c-MET-stained tumour cells was greater than grade 1. Here, HGF is linked to neoplasm.