| | Overall survival | Cancer-specific survival | | Univariate analysis | Multivariate analysis | Univariate analysis | Multivariate analysis |
| Characteristics | HR (95% CI) | P | HR (95% CI) | P | HR (95% CI) | P | HR (95% CI) | P | Age of diagnosis | | | | | | | | | 30–59 years | Reference | | | Reference | Reference | 60–84 years | 1.129 (0.941,1.354) | 0.193 | | | 1.201 (0.977,1.476) | 0.082 | 1.198 (0.971,1.477) | 0.092 | Gender | | | | | | | | | Male | Reference | | | Reference | | | Female | 0.990 (0.807,1.215) | 0.925 | | | 1.001 (0.796, 1.259) | 0.993 | | | Race | | | | | | | | | White | Reference | Reference | Reference | Reference | Black | 1.008 (0.777, 1.308) | 0.952 | 1.005 (0.773, 1.306) | 0.97 | 0.997 (0.742, 1.339) | 0.982 | 0.984 (0.731, 1.324) | 0.914 | Others | 0.506 (0.395, 0.648) | <0.001 | 0.491 (0.382, 0.630) | <0.001 | 0.541 (0.412, 0.710) | <0.001 | 00.519 (0.394, 0.683) | <0.001 | Grade | | | | | | | | | I | Reference | Reference | Reference | Reference | | | | | II | 1.171 (0.964, 1.423) | 0.111 | 1.144 (0.941, 1.391) | 0.178 | 1.185 (0.952, 1.476) | 0.129 | 1.150 (0.922, 1.434) | 0.214 | III | 1.407 (1.062, 1.863) | 0.017 | 1.507 (1.137, 1.998) | 0.004 | 1.491 (1.092, 2.035) | 0.012 | 1.566 (1.146, 2.142) | 0.005 | IV | 2.136 (0.681, 6.696) | 0.193 | 3.235 (1.015, 10.316) | 0.047 | 2.788 (0.887, 8.769) | 0.079 | 3.644 (1.130, 11.750) | 0.03 | SEER stage | | | | | | | | | Localized | Reference | Reference | Reference | Reference | Regional | 1.329 (0.993, 1.780) | 0.056 | 0.942 (0.687, 1.290) | 0.707 | 1.380 (0.999, 1.906) | 0.051 | 0.932 (0.657, 1.322) | 0.692 | Chemotherapy | | | | | | | | | No | Reference | Reference | Reference | Reference | Yes | 1.433 (1.149,1.786) | 0.001 | 1.148 (0.908,1.451) | 0.249 | 1.568 (1.233,1.994) | <0.001 | 1.242 (0.959,1.608) | 0.1 | Tumor size | | | | | | | | | <3 cm | Reference | Reference | Reference | Reference | 3–5 cm | 1.427 (1.187, 1.715) | <0.001 | 1.340 (1.112, 1.614) | 0.002 | 1.450 (1.178, 1.785) | <0.001 | 1.329 (1.076, 1.641) | 0.008 | >5 cm | 1.540 (1.149, 2.063) | 0.004 | 1.636 (1.198, 2.236) | 0.002 | 1.772 (1.294, 2.426) | <0.001 | 1.787 (1.273,2.509) | 0.001 | AJCC T | | | | | | | | | T1 | Reference | Reference | Reference | Reference | T2 | 1.641 (1.354, 1.989) | <0.001 | 1.606 (1.298, 1.986) | <0.001 | 1.722 (1.390, 2.133) | <0.001 | 1.718 (1.355, 2.178) | <0.001 | Treatment | | | | | | | | | Surgical resection | Reference | Reference | Reference | Reference | Radiofrequency ablation | 1.755 (1.470, 2.095) | <0.001 | 1.761 (1.474, 2.104) | <0.001 | 1.667 (1.368, 2.031) | <0.001 | 1.686 (1.382, 2.057) | <0.001 |
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