Kaplan Meyer survival curves for patients separated by β₂-microglobulin and HGF. (▿) β₂-microglobulin low (<6.00 mg/L), HGF low (<1.10 ng/mL), n = 140; (▵) β₂-microglobulin low (<6.00 mg/L), HGF high (≥1.10 ng/mL), n = 96; (◊) β₂-microglobulin high (≥6.00 mg/L), HGF low (<1.10 ng/mL), n = 72; (○) β₂-microglobulin high (≥6.00 mg/L), HGF high (≥1.10 ng/mL), n = 71. The survival difference between (▿) and (▵) was not significant. The survival difference between (◊) and (○) was significant (P = .04).