Table 7

Multivariate Cox regression analysis of survival in node-negative patients

FactorsRRa95% CIP
Tumor differentiationb (well:mod)4.0730.792–20.9570.093
Venous invasion (yes:no)2.7510.503–15.0570.243
Depth of invasionc (∼mp:ss∼)0.6300.055–7.1700.709
Tumor size (<5.0 cm:≥5.0 cm)1.2260.208–7.2250.822
Micrometastasis in LNs (positive:negative)1.0310.226–4.7160.968
  • a RR, risk ratio; CI, confidence interval.

  • b well, well differentiated; mod, moderately differentiated.

  • c mp, muscularis propria; ss, subserosa.