Table 4.

DSS by Lymph Nodes Examined for Different Subgroups

Lymph Nodes Examined	Number of Cases Above Each Cutoff (%)	P on Univariate Analysis	P on Multivariate Analysis	HR (95% CI)
Tumor location
Head (n = 288)
≥2	270 (93.8%)	0.38	—	—
≥3	257 (89.2%)	0.771	—	—
≥4	247 (85.8%)	0.408	—	—
≥5	240 (83.3%)	0.307	—	—
≥6	230 (79.9%)	0.461	—	—
≥7	221 (76.7%)	0.661	—	—
≥8	211 (73.3%)	0.63	—	—
≥9	197 (68.4%)	0.842	—	—
≥10	190 (66%)	0.728	—	—
≥15	124 (43.1%)	0.113	—	—
Body (n = 97)
≥2	87 (89.7%)	0.909	—	—
≥3	80 (82.5%)	0.284	—	—
≥4	73 (75.3%)	0.359	—	—
≥5	68 (70.1%)	0.171	—	—
≥6	60 (61.9%)	0.175	—	—
≥7	54 (55.7%)	0.249	—	—
≥8	51 (52.6%)	0.138	—	—
≥9	44 (45.4%)	0.041	0.219	2.7 (0.55–13.16)
≥10	40 (41.2%)	0.245	—	—
≥15	30 (30.9%)	0.09	—	—
Tail (n = 321)
≥2	296 (92.2%)	0.726
≥3	264 (82.2%)	0.949
≥4	240 (74.8%)	0.874
≥5	217 (67.6%)	0.922
≥6	199 (62%)	0.598
≥7	180 (56.1%)	0.874
≥8	152 (47.4%)	0.323
≥9	139 (43.3%)	0.281
≥10	122 (38%)	0.254
≥15	56 (17.4%)	0.094
Extent of resection
Local excision (n = 771)
≥2	713 (92.5%)	0.894
≥3	648 (84%)	0.681
≥4	596 (77.3%)	0.88
≥5	556 (72.1%)	0.568
≥6	513 (66.5%)	0.575
≥7	477 (61.9%)	0.558
≥8	429 (55.6%)	0.342
≥9	394 (51.1%)	0.207
≥10	361 (46.8%)	0.248
≥15	212 (27.5%)	0.478
Partial or total pancreatectomy (n = 125)
≥2	113 (90.4%)	0.216
≥3	108 (86.4%)	0.312
≥4	101 (80.8%)	0.136
≥5	98 (78.4%)	0.144
≥6	92 (73.6%)	0.285
≥7	89 (71.2%)	0.286
≥8	88 (70.4%)	0.367
≥9	81 (64.8%)	0.846
≥10	78 (62.4%)	0.443
≥15	52 (41.6%)	0.615