Characteristics and prognosis of synchronous multiple early gastric cancer

Table 2 Clinical features of synchronous multiple early gastric cancer (group A) and single gastric cancer patients (group B) n (%)

Factors	Group A (n = 146)	Group B (n = 1194)	P value
Tumor location
Upper	30 (20.6)	183 (15.3)	0.052
Middle	40 (27.4)	450 (37.7)
Lower	76 (52.1)	554 (46.4)
Entire	0 (0.0)	7 (0.5)
Tumor size (mm) (mean ± SD)	30.8 ± 15.9	32.5 ± 21.5	0.347
Macroscopic type
Elevated	39 (26.7)	218 (18.3)	0.019
Flat	2 (1.4)	16 (1.3)
Depressed	81 (55.5)	815 (68.3)
Mixed	24 (16.4)	145 (12.1)
Histological type
Differentiated	118 (80.8)	771 (64.6)	< 0.001
Undifferentiated	28 (19.2)	423 (35.4)
Depth of invasion
Mucosa	66 (45.2)	672 (56.1)	0.011
Submucosa	80 (54.8)	522 (43.9)
LN metastasis
0	134 (91.8)	1110 (93.0)	0.595
1	8 (5.5)	63 (5.3)
2	4 (2.7)	15 (1.3)
3	0 (0.0)	6 (0.5)
No. of metastatic LNs	0.18 ± 0.72	0.21 ± 1.30	0.805
Lymphatic invasion	61 (41.8)	394 (33.0)	0.034
Venous invasion	13 (8.9)	90 (7.5)	0.559
Stage
I	142 (97.3)	1173 (98.2)	0.408
II	4 (2.7)	21 (1.8)