Table 1 Basic characteristics of the SMA and SSA groups
Characteristic | Mean (SD)/No. (%) | P value | |
|---|---|---|---|
SMA (n = 130) | SSA (n = 129) | ||
Age, years | 58.8 (11.3) | 59.0 (10.3) | 0.886 |
BMI, kg/m2 | 22.5 (3.2) | 22.3 (3.1) | 0.738 |
Sex | |||
 Male | 87 (66.9) | 88 (68.2) | 0.824 |
 Female | 43 (33.1) | 41 (31.8) | |
ECOG performance status | |||
 0 | 107 (82.3) | 107 (82.9) | 0.892 |
 1 | 23 (17.7) | 22 (17.1) | |
Tumor location | |||
 Upper | 27 (20.8) | 21 (16.3) | 0.527 |
 Middle | 31 (23.8) | 37 (28.7) | |
 Lower | 72 (55.4) | 71 (55.0) | |
Surgical procedure | |||
 Distal gastrectomy | 71 (54.6) | 65 (50.4) | 0.496 |
 Total gastrectomy | 59 (45.4) | 64 (49.6) | |
Reconstruction | |||
 Billroth I | 5 (3.8) | 10 (7.8) | 0.239 |
 Billroth II | 66 (50.8) | 55 (42.6) | |
 Roux-en-Y | 59 (45.4) | 64 (49.6) | |
Histology | |||
 Differentiated | 55 (42.3) | 57 (44.2) | 0.760 |
 Undifferentiated | 75 (57.7) | 72 (55.8) | |
Lymphvascular invasion | |||
 Negative | 74 (56.9) | 80 (62.0) | 0.404 |
 Positive | 56 (43.1) | 49 (38.0) | |
Size, cm | |||
 ≤ 4 | 75 (57.7) | 83 (64.3) | 0.273 |
 > 4 | 55 (42.3) | 46 (35.7) | |
cT category | |||
 cT1 | 41 (31.5) | 46 (35.7) | 0.871 |
 cT2 | 19 (14.6) | 16 (12.4) | |
 cT3 | 42 (32.3) | 42 (32.6) | |
 cT4a | 28 (21.5) | 25 (19.4) | |
cN category | |||
 cN0 | 52 (40.0) | 57 (44.2) | 0.495 |
 cN+ | 78 (60.0) | 72 (55.8) | |
pT category | |||
 pT1 | 39 (30.0) | 47 (36.4) | 0.528 |
 pT2 | 19 (14.6) | 13 (10.1) | |
 pT3 | 48 (36.9) | 43 (33.3) | |
 pT4a | 24 (18.5) | 26 (20.2) | |
pN category | |||
 pN0 | 52 (40.0) | 58 (45.0) | 0.942 |
 pN1 | 27 (20.8) | 24 (18.6) | |
 pN2 | 23 (17.7) | 20 (15.5) | |
 pN3a | 20 (15.4) | 20 (15.5) | |
 pN3b | 8 (6.2) | 7 (5.4) | |
AJCC 8th pTNM staging | |||
 I | 46 (35.4) | 49 (38.0) | 0.767 |
 II | 34 (26.2) | 36 (27.9) | |
 III | 50 (38.5) | 44 (34.2) | |
CEA, ng/ml | |||
 < 5 | 110 (84.6) | 104 (80.6) | 0.396 |
 ≥ 5 | 20 (15.4) | 25 (19.4) | |
CA19-9, U/ml | |||
 < 37 | 110 (84.6) | 112 (86.8) | 0.612 |
 ≥ 37 | 20 (15.4) | 17 (13.2) | |
CA72-4, U/ml | |||
 < 6.9 | 120 (92.3) | 116 (89.9) | 0.500 |
 ≥ 6.9 | 10 (7.7) | 13 (10.1) | |
AFP, ng/ml | |||
 < 20 | 128 (98.5) | 125 (96.9) | 0.403 |
 ≥ 20 | 2 (1.5) | 4 (3.1) | |
CA125, U/ml | |||
 < 35 | 127 (97.7) | 126 (97.7) | 0.992 |
 ≥ 35 | 3 (2.3) | 3 (2.3) | |