Table 3.
Patterns of Distant Metastases of Patient Cohort Before and After the Covariate Balancing Propensity Score Weighting.
| Metastatic pattern | No. of patients before CBPS (%) | No. of patients after CBPS (%) | ||||
|---|---|---|---|---|---|---|
| Total | Non-surgery | Surgery | Total | Non-surgery | Surgery | |
| One site of distant metastasis | ||||||
| Liver | 2025 (6.0) | 1965 (6.0) | 60 (5.6) | 2033 (6.0) | 1963 (6.0) | 70 (6.5) |
| Distant lymph node | 2453 (7.3) | 2379 (7.3) | 74 (6.9) | 2459 (7.3) | 2376 (7.3) | 83 (7.8) |
| Othera | 3416 (10.2) | 3217 (9.9) | 199 (18.5) | 3400 (10.1) | 3298 (10.1) | 102 (9.5) |
| Bone | 9037 (26.9) | 8830 (27.1) | 207 (19.3) | 9065 (27.0) | 8755 (26.9) | 310 (28.9) |
| Brain | 6548 (19.5) | 6141 (18.9) | 407 (37.9) | 6520 (19.4) | 6324 (19.4) | 196 (18.2) |
| Two sites of distant metastasis | ||||||
| Liver + Distant lymph node | 338 (1.0) | 334 (1.0) | 4 (0.4) | 342 (1.0) | 328 (1.0) | 14 (1.3) |
| Brain + Liver | 580 (1.7) | 573 (1.8) | 7 (0.7) | 577 (1.7) | 562 (1.7) | 15 (1.4) |
| Brain + Distant lymph node | 650 (1.9) | 640 (2.0) | 10 (0.9) | 648 (1.9) | 629 (1.9) | 19 (1.8) |
| Bone + Distant lymph node | 1212 (3.6) | 1196 (3.7) | 16 (1.5) | 1213 (3.6) | 1174 (3.6) | 39 (3.7) |
| Bone + Liver | 2284 (6.8) | 2260 (6.9) | 24 (2.2) | 2283 (6.8) | 2214 (6.8) | 68 (6.3) |
| Bone + Brain | 2594 (7.7) | 2548 (7.8) | 46 (4.3) | 2598 (7.7) | 2514 (7.7) | 84 (7.8) |
| Three sites of distant metastases | ||||||
| Brain + Liver + Distant lymph node | 96 (0.3) | 95 (0.3) | 1 (0.1) | 96 (0.3) | 93 (0.3) | 3 (0.3) |
| Bone + Brain + Distant lymph node | 496 (1.5) | 493 (1.5) | 3 (0.3) | 495 (1.5) | 481 (1.5) | 14 (1.3) |
| Bone + Brain + Liver | 1074 (3.2) | 1068 (3.3) | 6 (0.5) | 1075 (3.2) | 1042 (3.2) | 33 (3.1) |
| Bone + Liver + Distant lymph node | 546 (1.6) | 540 (1.7) | 6 (0.5) | 545 (1.6) | 529 (1.6) | 16 (1.5) |
| Four sites of distant metastases | 263 (0.8) | 259 (0.8) | 4 (0.4) | 262 (0.8) | 255 (0.8) | 7 (0.7) |
Abbreviation: CBPS, covariate balancing propensity score weighting.
a Distant metastasis except for bone, brain, liver, and distant lymph node.