Table 1: Background of enrolled patients.

Number of patients received iBCG therapy 555 cases
Male/Female ratio 438/117 cases
Mean age ± SD (years) 72 ± 10
T stage of bladder cancer (Tis/Ta/T1/T2) 158/209/158/30 cases
Cellular atypism (G1/G2/G3) 146/283/126 cases

iBCG: intravesical Bacillus Calmette-Guerin; Tis: carcinoma in situ; Ta: noninvasive papillary cancer; T1: invasion to submucosa; T2: invasion to muscle layer; G1: low-grade; G2: lowgrade and high-grade; G3: high-grade cancer.