HIF1A and hepatocellular carcinoma: Subgroup analysis indicated that elevated HIF-1α levels were significantly associated with DFS in HCC patients with preoperative adjuvant antitumor therapy [HR = 2.24 (95% CI: 1.37, 3.64)], without any heterogeneity in the data (χ2 = 0.14,Ι2 = 0.0%,P = 0.708).