Provenge治疗一个疗程花费9.3万美元，延长生命平均四个月。
Provenge costs $93,000 for a course of treatment and extends life by an average of four months.
本研究的目的是评估延长疗程对经济学的影响。
The aim of this study was to evaluate the economic impact of an extended course of treatment.
说明，在设计研究治疗时，疗程要适当延长，病房环境要改造，使病人在治疗环境中取得的进步行为巩固下来。
It was suggested that music therapy should be lengthened and the ward environment modified to reinforce the positive behavior that the patients got in the treatment.
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