Baseline variables | 2000 to 2010 unadjusted HR (95% CI) | p value | 2011 to 2016 unadjusted HR (95% CI) | p value | p value* |
---|---|---|---|---|---|
Age at resection, years | |||||
(≥ 65 vs < 65 years) | 0.712 (0.482–1.051) | 0.0873 | 0.920 (0.504–1.680) | 0.7865 | 0.1084 |
Sex | |||||
Male vs female | 1.232 (0.866–1.752) | 0.2462 | 1.173 (0.655–2.098) | 0.5917 | 0.1381 |
ASA score | |||||
[3 and 4] vs [1 and 2] | 1.411 (0.937–2.124) | 0.0990 | 0.631 (0.282–1.414) | 0.2631 | 0.0521 |
CEA, ng/ml | |||||
% with ≥ 200 ng/ml | 1.796 (1.050–3.070) | 0.0324 | 3.383 (1.511–7.573) | 0.0030 | 0.1388 |
Primary tumour grade | |||||
Poor vs well or moderate | 2.417 (1.198–4.875) | 0.0137 | 2.038 (0.639–6.504) | 0.2291 | 0.1607 |
pTumour stage | |||||
3 and 4 vs 1 and 2 | 1.929 (0.899–4.139) | 0.0918 | 0.907 (0.387–2.125) | 0.8214 | 0.0681 |
pNode stage | |||||
1 and 2 vs 0 | 1.663 (1.065–2.595) | 0.0252 | 2.923 (1.543–5.538) | 0.0010 | 0.3195 |
Primary tumour | |||||
Colon vs rectal | 0.845 (0.571–1.250) | 0.3998 | 0.899 (0.448–1.803) | 0.7641 | 0.1671 |
Largest liver metastases | |||||
≥ 5 vs < 5 cm | 1.313 (0.867–1.988) | 0.1979 | 1.306 (0.612–2.788) | 0.4907 | 0.2049 |
Distribution of liver metastases | |||||
Bilobar vs unilobar | 1.142 (0.763–1.710) | 0.5185 | 1.608 (0.888–2.914) | 0.1171 | 0.1347 |
Multiple vs solitary liver metastases | |||||
Multiple vs solitary | 1.074 (0.757–1.524) | 0.6898 | 1.959 (1.117–3.435) | 0.0190 | 0.0950 |
Synchronous vs metachronous liver metastases | |||||
Synchronous vs metachronous | 1.428 (1.010–2.019) | 0.0441 | 1.627 (0.932–2.842) | 0.0870 | 0.1591 |
Major vs minor hepatectomy | |||||
Major vs minor | 1.400 (0.990–1.981) | 0.0571 | 1.475 (0.853–2.552) | 0.1647 | 0.2410 |
Margins (R1/R2 vs R0) | |||||
R1/R2 vs R0 | 1.244 (0.798–1.940) | 0.3344 | 1.473 (0.709–3.061) | 0.2990 | 0.1776 |
DFI (> 12 months vs ≤ 12 months) | |||||
> 12 months vs ≤ 12 months | 0.300 (0.184–0.4904) | < 0.0001 | 0.472 (0.237–0.939) | 0.0327 | 0.0178 |
Neoadjuvant chemotherapy for liver metastases | |||||
Yes vs no | 1.478 (1.005–2.173) | 0.0472 | 1.340 (0.770–2.331) | 0.3002 | 0.2496 |
Adjuvant chemotherapy for liver metastases | |||||
Yes vs no | 0.790 (0.553–1.128) | 0.1945 | 1.126 (0.647–1.959) | 0.6748 | 0.1604 |
CRS liver score | |||||
≥ 3 vs < 3 | 1.478 (1.045–2.091) | 0.0273 | 2.742 (1.538–4.888) | 0.0006 | 0.2062 |