Table 4 Cox’s multivariate analysis for prognostic factors for relapse-free survival excluding Stage II cases with <12 harvested lymph nodes

Change in the decompression method

No/Yes

250/16

0.434

0.220–0.854

0.016

Depth of invasion

T3/T4

155/111

0.477

0.317–0.720

<0.001

Lymph node metastasis

N0/N1-2

130/136

0.514

0.324–0.815

0.005

Postoperative complication (CD classification)

0–1/2–5

71/195

0.681

0.442–1.050

0.082

Adjuvant chemotherapy

Yes/No

138/128

0.554

0.346–0.887

0.014