Table 1. Patient Demographic and Tumor Characteristics (Modified Intention-to-Treat Population).
| Variable | LG (n = 119) | RG (n = 117) |
|---|---|---|
| Patient demographic characteristics | ||
| Sex, No. (%) | ||
| Male | 77 (64.7) | 73 (62.4) |
| Female | 42 (35.3) | 44 (37.6) |
| Age, median (range), y | 72 (40-90) | 71 (34-90) |
| Institution, No. (%) | ||
| Wakayama Medical University Hospital | 108 (90.8) | 109 (93.2) |
| Mie University Hospital | 11 (9.2) | 8 (6.8) |
| BMI, median (range) | 22.4 (14.0-31.9) | 21.9 (14.0-32.1) |
| ASA score, No. (%) | ||
| 1 | 44 (37.0) | 39 (33.3) |
| 2 | 72 (60.5) | 74 (63.2) |
| 3 | 3 (2.5) | 4 (3.4) |
| Comorbidity, No. (%) | ||
| Hypertension | 62 (52.1) | 53 (45.3) |
| Type 1 or 2 diabetes | 28 (23.5) | 20 (17.1) |
| Pulmonary | 7 (5.9) | 10 (8.5) |
| Cardiovascular | 13 (10.9) | 14 (12.0) |
| Renal | 7 (5.9) | 4 (3.4) |
| Hepatic | 2 (1.7) | 2 (1.7) |
| Cerebrovascular | 16 (13.4) | 6 (5.1) |
| History of abdominal surgery, No. (%) | 27 (22.7) | 32 (27.4) |
| Open cholecystectomy | 4 (3.4) | 2 (1.7) |
| Laparoscopic cholecystectomy | 3 (2.5) | 3 (2.6) |
| Appendectomy | 14 (11.8) | 18 (15.4) |
| Colorectal surgery | 3 (2.5) | 3 (2.6) |
| Gynecological surgery | 7 (5.9) | 8 (6.8) |
| Hepatectomy | 0 | 1 (0.9) |
| Smoking history, Brinkman index, median (range) | 60 (0-2500) | 400 (0-4000) |
| Daily drinker, No. (%) | 57 (47.9) | 48 (41.0) |
| Tumor characteristics | ||
| Location, No. (%) | ||
| Upper third of the stomach | 24 (20.2) | 31 (26.5) |
| Middle third of the stomach | 43 (36.1) | 35 (29.9) |
| Lower third of the stomach | 50 (42.0) | 46 (39.3) |
| Whole stomach | 2 (1.7) | 5 (4.3) |
| Size, median (range), mm | 32 (3-120) | 35 (8-150) |
| Macroscopic type, No. (%)a | ||
| 0 | 55 (46.2) | 57 (48.7) |
| 1 | 6 (5.0) | 4 (3.4) |
| 2 | 22 (18.5) | 20 (17.1) |
| 3 | 29 (24.4) | 30 (25.6) |
| 4 | 4 (3.4) | 5 (4.3) |
| 5 | 3 (2.5) | 1 (0.9) |
| Histologic type, No. (%)a | ||
| Pap | 1 (0.8) | 1 (0.9) |
| Tub1 | 35 (29.4) | 32 (27.4) |
| Tub2 | 34 (28.6) | 28 (23.9) |
| Por | 42 (35.3) | 46 (39.3) |
| Sig | 2 (1.7) | 6 (5.1) |
| Muc | 2 (1.7) | 1 (0.9) |
| Others | 3 (2.5) | 3 (2.6) |
| pT stage, No. (%)b | ||
| T1a | 23 (19.3) | 25 (21.4) |
| T1b | 40 (33.6) | 43 (36.8) |
| T2 | 14 (11.8) | 10 (8.5) |
| T3 | 26 (21.8) | 25 (21.4) |
| T4a | 15 (12.6) | 11 (9.4) |
| T4b | 1 (0.8) | 3 (2.6) |
| pN stage, No. (%)b | ||
| N0 | 70 (58.8) | 76 (65.0) |
| N1 | 24 (20.2) | 19 (16.2) |
| N2 | 12 (10.1) | 15 (12.8) |
| N3 | 13 (10.9) | 7 (6.0) |
| pM stage, No. (%)b | ||
| M0 | 111 (93.3) | 114 (97.4) |
| M1 | 8 (6.7) | 3 (2.6) |
| p Stage, No. (%)b | ||
| IA | 52 (43.7) | 52 (44.4) |
| IB | 19 (16.0) | 16 (13.7) |
| IIA | 12 (10.1) | 18 (15.4) |
| IIB | 9 (7.6) | 13 (11.1) |
| IIIA | 9 (7.6) | 10 (8.5) |
| IIIB | 5 (4.2) | 2 (1.7) |
| IIIC | 5 (4.2) | 3 (2.6) |
| IV | 8 (6.7) | 3 (2.6) |
Abbreviations: ASA, American Society of Anesthesiologists; BMI, body mass index (calculated as weight in kilograms divided by height in meters squared); LG, laparoscopic gastrectomy; Muc, mucinous adenocarcinoma; Pap, papillary adenocarcinoma; Por, poorly differentiated adenocarcinoma; RG, robotic gastrectomy; Sig, signet-ring cell carcinoma; Tub1, well differentiated tubular adenocarcinoma; Tub2, moderately differentiated tubular adenocarcinoma.
a
Japanese Classification of Gastric Carcinoma.18
b
UICC 8th edition.17