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Point scoring of overall survival for the prognostic models
| Variable | Point | ||
|---|---|---|---|
| 0 | 1 | 2 | |
| AJCC 7th stage | IVa | IVb | |
| CTC number, per mL | ≤30 | >30 | |
| ECOG performance | 0-1 | 2-3 | |
| Histological grade | well or moderately | poorly | |
| Previous history of colectomy | yes | no | |
AJCC: American Joint Committee on Cancer; CTC: circulating tumour cell; ECOG: Eastern Cooperative Oncology Group
