Clinicopathologic factors and molecular markers related to lymph node metastasis in early gastric cancer

Table 1 Baseline characteristics of patients with early gastric cancer (n = 1104)

Characteristics	Value
Age (yr)
< 60	546 (49.5)
≥ 60	558 (50.5)
mean ± SD	58.49 ± 11.63
Gender
Male	709 (64.2)
Female	395 (35.8)
Size of tumor (mm)
< 20 mm	397 (34.3)
≥ 20 mm	725 (65.7)
mean ± SD	27.8 ± 17.8
Location
Upper third	125 (11.3)
Middle third	325 (29.4)
Lower third	654 (59.2)
Macroscopic type
Elevated (I, IIa, I + IIa, IIa + IIb)	86 (7.8)
Flat (IIb)	81 (7.3)
Depressed (IIc, III, IIb + III)	815 (73.8)
Mixed	122 (11.1)
Depth of invasion
Mucosa	625 (56.6)
Submucosa
Sm 1	150 (13.6)
Sm 2	157 (14.2)
Sm 3	172 (15.6)
Ulcer
Absent	958 (86.8)
Present	146 (13.2)
Lymphovascular invasion
Absent	955 (86.5)
Present	149 (13.5)
Histological type
Well differentiated	236 (21.4)
Moderate differentiated	398 (36.1)
Poorly differentiated	243 (22.0)
Signet ring cell	227 (20.6)
Lymph-node metastasis
Negative	1000 (90.6)
Positive	104 (9.4)

Data are expressed as absolute numbers (percentage) or mean ± SD. Sm1: Upper third; Sm2: Middle third; Sm3: Lower third.