HGF and squamous cell carcinoma: Within HN group, HGF/c-MET was detected in 7 of 17 (40%) squamous cell carcinomas (HN1, HN5, HN7, HN8, HN21, HN25, HN26), and 4 of 16 (25%) non-squamous cell carcinomas (HN12, HN15, HN16, HN33).