肿瘤治疗是有毒性的，并且往往不能耐受，这一事实要求从科学角度来更好的理解这种疾病的背景和病因。
The fact that cancer therapies were toxic and often could not be tolerated forced science to better understand the background and cause of the disease.
举例来说，对乳糖——牛奶中所含的一种糖——不耐受的人，身体不能就不能分解乳糖。
For example, in individuals with lactose intolerance, the body is unable to break down lactose, a sugar found in milk.
不幸的是，干扰素在全球并不能普遍获得，并不总是耐受良好，有些基因型比其它基因型反应更好，而且许多使用干扰素治疗的人并未完成其疗程。
Unfortunately, interferon is not widely available globally, is not always well tolerated, some genotypes respond better than others, and many people who take it do not finish their treatment.
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