Cancer/testis antigen, Kita-Kyushu lung cancer antigen-1 and ABCD stratification for diagnosing gastric cancers

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.