TRIANGLE operation, combined with adequate adjuvant chemotherapy, can improve the prognosis of pancreatic head cancer: A retrospective study

Table 4 P values for survival comparisons between the four groups

Group comparison	P value of mRFS	P value of mOS
Group 1 vs group 2	0.002b	< 0.001c
Group 1 vs group 3	0.013a	0.488
Group 1 vs group 4	< 0.001c	< 0.001c
Group 2 vs group 3	0.663	0.031a
Group 2 vs group 4	0.027a	0.040a
Group 3 vs group 4	0.147	< 0.001c

^aP < 0.05.

^bP < 0.01.

^cP < 0.001.

Group 1: No clearance of the Heidelberg triangle and not receiving ≥ 6 months of adjuvant chemotherapy; Group 2: No clearance of the Heidelberg triangle but receiving ≥ 6 months of adjuvant chemotherapy; Group 3: Clearance of the Heidelberg triangle but not receiving ≥ 6 months of adjuvant chemotherapy; Group 4: Clearance of the Heidelberg triangle and receiving ≥ 6 months of adjuvant chemotherapy;mRFS: Median recurrence-free survival; mOS: Median overall survival.