| Feature | MLH1 | χ2 | P | MSH2 | χ2 | P | PMS2 | χ2 | P | PD-L1 | χ2 | P | ||||
| +[n (%)] | −[n (%)] | +[n (%)] | −[n (%)] | +[n (%)] | −[n (%)] | +[n (%)] | −[n (%)] | |||||||||
| Gender |
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| Male | 16 (84.2) | 3 (15.8) | 0.031 | 0.861 | 15 (78.9) | 4 (21.1) | 1.282 | 0.258 | 16 (84.2) | 3 (15.8) | 0.465 | 0.495 | 6 (31.6) | 13 (68.4) | 0.000 | 1.000 |
| Female | 20 (90.9) | 2 (9.1) | 21 (95.5) | 1 (4.5) | 21 (95.5) | 1 (4.5) | 6 (27.3) | 16 (72.7) | ||||||||
| Age |
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| ≥63 | 20 (100) | 0 | － | 0.048 | 19 (95) | 1 (5) | 0.804 | 0.370 | 19 (95) | 1 (5) | 0.226 | 0.635 | 4 (20) | 16 (80) | 0.864 | 0.353 |
| <63 | 16 (76.2) | 5 (23.8) | 17 (81) | 4 (19) | 18 (85.7) | 3 (14.3) | 8 (38.1) | 13 (61.9) | ||||||||
| Stage |
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| I + II | 28 (96.6) | 1 (3.4) | 4.564 | 0.033 | 28 (96.6) | 1 (3.4) | 4.564 | 0.033 | 28 (96.6) | 1 (3.4) | 2.364 | 0.124 | 9 (31) | 20 (69) | 0.000 | 0.993 |
| III + IV | 8 (66.7) | 4 (33.3) | 8 (66.7) | 4 (33.3) | 9 (75) | 3 (25) | 3 (25) | 9 (75) | ||||||||
| T Stage |
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| T1 + T2 | 31 (91.2) | 3 (8.8) | 0.672 | 0.412 | 31 (91.2) | 3 (8.8) | 0.672 | 0.412 | 31 (91.2) | 3 (8.8) | 0.000 | 1.000 | 10 (29.4) | 24 (70.6) | 0.000 | 1.000 |
| T3 + T4 | 5 (71.4) | 2 (28.6) | 5 (71.4) | 2 (28.6) | 6 (85.7) | 1 (14.3) | 2 (28.6) | 5 (71.4) | ||||||||
| N Stage |
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| N1 | 9 (75) | 3 (25) | 1.182 | 0.277 | 11 (91.7) | 1 (8.3) | 0.000 | 1.000 | 11 (91.7) | 1 (8.3) | 0.000 | 1.000 | 3 (25) | 9 (75) | 0.000 | 0.993 |
| N0 | 27 (93.1) | 2 (6.9) | 25 (86.2) | 4 (13.8) | 26 (89.7) | 3 (10.3) | 9 (31) | 20 (69) | ||||||||
| M Stage |
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| M1 | 8 (72.7) | 3 (27.3) | 1.557 | 0.212 | 8 (72.7) | 3 (27.3) | 1.557 | 0.212 | 9 (81.8) | 2 (18.2) | 0.257 | 0.612 | 2 (18.2) | 9 (81.8) | 0.311 | 0.577 |
| M0 | 28 (93.3) | 2 (6.7) | 28 (93.3) | 2 (6.7) | 28 (93.3) | 2 (6.7) | 10 (33.3) | 20 (66.7) | ||||||||
| Tumor locations |
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| The head of the pancreas | 22 (95.7) | 1 (4.3) | 1.575 | 0.210 | 20 (87) | 3 (13) | 0.000 | 1.000 | 22 (95.7) | 1 (44.3) | 0.622 | 0.430 | 6 (26.1) | 17 (73.9) | 0.026 | 0.873 |
| The Body and tail of pancreas | 14 (77.8) | 4 (22.2) | 16 (88.9) | 2 (11.1) | 15 (83.3) | 3 (16.7) | 6 (33.3) | 12 (66.7) | ||||||||
| source |
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| surgery | 15 (93.8) | 1 (6.3) | 0.195 | 0.659 | 13 (81.3) | 3 (18.8) | 0.288 | 0.591 | 14 (87.5) | 2 (12.5) | 0.000 | 1.000 | 4 (25) | 12 (75) | 0.017 | 0.898 |
| puncture | 21 (84) | 4 (16) | 23 (92) | 2 (8) | 23 (92) | 2 (8) | 8 (32) | 17 (68) | ||||||||