网路上找到这一篇文章，把这件事讲的满清楚的。 连结在此 http://www.quackwatch.com/01QuackeryRelatedTopics/Cancer/laetrile.html 节录其中一段关於NCI(National Cancer Institute)做的临床研究 In July 1980, the NCI undertook clinical trials of 178 cancer patients who received Laetrile, vitamins and enzymes at the Mayo Clinic and three other prominent cancer centers. The study included patients for whom no other treatment had been effective or for whom no proven treatment was known. All patients had tumor masses that could easily be measured, but most of the patients were in good physical condition. Since Laetrile proponents were unable to agree on the formula or testing protocol for Laetrile, NCI decided to use a preparation that corresponded to the substance distributed by the major Mexican supplier, American Biologics. The preparation was supplied by the NCI Pharmaceutical Resources Branch and verified by a variety of tests. The dosage of Laetrile was based on the published recommendations of Krebs, Jr., and the Bradford Foundation. The results of the trial were clear-cut. Not one patient was cured or even stabilized. The median survival rate was 4.8 months from the start of therapy, and in those still alive after seven months, tumor size had increased. This was the expected result for patients receiving no treatment at all. In addition, several patients experienced symptoms of cyanide toxicity or had blood levels of cyanide approaching the lethal range [8]. An accompanying editorial concluded: 简单的解释一下这段，1980年8月， NCI找了178名自愿的癌症病患 来做杏素治疗的临床试验，这些病人包括了一些其他疗法都无效的 病患，这些病患的肿瘤都已经发展至足以量测的大小，且身体条件 良好。给予病患服用的剂量则按照Krebs, Jr.的建议。 试验的结果相当清楚，没有任何一个病患是痊癒的，甚至没有人出 现病情稳定的结果。这些病患的存活时间的中位数是4.8个月(从开 始接受疗程算起)，少数人可以活到7个月後，不过肿瘤的大小也成 长了。这样的结果和未受任何疗程下的预期结果差不多。此外，有 数位病患出现氰中毒或是血中氰化物浓度过高的现像。 --

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