Table 1. Operating characteristics for adaptive randomisation algorithm.

Operating characteristic	Standard treatment alone	Standard treatment + huachansu
True overall response rate	50%	50%
Average number of patients	32.8	32.8
Probability of selection as best	0.519	0.481
Probability of early selection	0.039	0.034
True overall response rate	50%	60%
Average number of patients	28.8	36.2
Probability of selection as best	0.060	0.940
Probability of early selection	0.007	0.100
True overall response rate	50%	70%
Average number of patients	24.3	35.6
Probability of selection as best	0.006	0.994
Probability of early selection	0.002	0.305
True overall response rate	50%	80%
Average number of patients	20.5	30.7
Probability of selection as best	0.001	0.999
Probability of early selection	0.001	0.594