Table 1.
Characteristics of 77 patients with gastric cancer
| Characteristics | Number of patients, n (%) |
| Mean age, yr (range) | 71.1 (30-86) |
| Gender | |
| Male | 49 (63.6) |
| Female | 28 (36.4) |
| Depth of invasion | |
| T1 | 28 (36.4) |
| T2 | 25 (32.5) |
| T3 | 21 (27.3) |
| T4 | 3 (3.9) |
| Lymph node metastasis | |
| N0 | 34 (44.2) |
| N1 | 14 (18.2) |
| N2 | 13 (16.9) |
| N3 | 16 (20.8) |
| Histological type | |
| Well-differentiated adenocarcinoma | 42 (54.5) |
| Poorly-differentiated adenocarcinoma | 29 (46.9) |
| Signet-ring cell carcinoma | 1 (1.3) |
| Carcinoma with lymphoid stroma | 3 (3.9) |
| Mucinous adenocarcinoma | 1 (1.3) |
| Endocrine carcinoma | 1 (1.3) |
| Stage of disease | |
| I | 29 (37.7) |
| II | 23 (29.9) |
| III | 12 (15.6) |
| IV | 13 (16.9) |
| H. pylori infection (IgG titer) | |
| Negative (< 20 U/mL) | 17 (22.1) |
| Positive (≥ 20 U/mL) | 60 (77.9) |
| PGI | |
| ≤ 70 ng/mL | 76 (98.7) |
| > 70 ng/mL | 1 (1.3) |
| PG I/PG II | |
| ≤ 3 | 64 (83.1) |
| > 3 | 13 (16.9) |
| PG method | |
| Positive (PG I ≤ 70 and PG I/II ≤ 3) | 63 (81.8) |
| Negative (except the cases described above) | 14 (18.2) |
| ABCD stratification (H. pylori infection/PG method) | |
| A (negative/negative) | 3 (3.9) |
| B (positive/negative) | 11 (14.3) |
| C (positive/positive) | 49 (63.6) |
| D (negative/positive) | 14 (18.2) |
| KK-LC-1 | |
| Positive | 63 (81.8) |
| Negative | 14 (18.2) |
Positive of H. pylori infection; IgG titer ≥ 20 U/mL, Positive of PG method; PG I ≤ 70 ng/mL and PG I/PG II ≤ 3. KK-LC-1: Kita–Kyushu lung cancer antigen-1; H. pylori: Helicobacter pylori.