Simple cholecystectomy is an adequate treatment for grade I T1bN0M0 gallbladder carcinoma: Evidence from 528 patients

Table 1 General characteristics and survival data for 528 patients with T1b gallbladder cancer

Characteristics	n = 528, n (%)	10-year survival
		OS, %	DSS, %
Age, yr
< 70	220 (41.7)	46.4%	62.7%
≥ 70	308 (58.3)	21.9%	58.9%
		P < 0.001	P = 0.023
Gender
Male	143 (27.1)	13.7	47.5
Female	385 (72.9)	37.8	64
		P = 0.007	P = 0.016
Grade
Grade I	161 (30.5)	33.1	64.7
Grade II	269 (50.9)	32.6	62.1
Grade III, IV	98 (18.6)	28.6	48.9
		P = 0.056	P = 0.002
Histological type
Adenocarcinoma	387 (73.3)	30.5	61.6
Papillary	79 (15.0)	40.2	61.8
Other	62 (11.7)	29	51
		P = 0.059	P = 0.058
Surgery
SC	346 (65.5)	27.8	55.1
SC + LN	131 (24.8)	35.5	66.3
RC	51 (9.7)	50.3	75.9
		P < 0.001	P = 0.002

OS: Overall survival; DSS: Disease-specific survival; SC: Simple cholecystectomy; LN: Lymph node resection; RC: Radical cholecystectomy; N: Number.