網路上找到這一篇文章，把這件事講的滿清楚的。 連結在此 http://www.quackwatch.com/01QuackeryRelatedTopics/Cancer/laetrile.html 節錄其中一段關於NCI(National Cancer Institute)做的臨床研究 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: 簡單的解釋一下這段，1980年8月， NCI找了178名自願的癌症病患 來做杏素治療的臨床試驗，這些病人包括了一些其他療法都無效的 病患，這些病患的腫瘤都已經發展至足以量測的大小，且身體條件 良好。給予病患服用的劑量則按照Krebs, Jr.的建議。 試驗的結果相當清楚，沒有任何一個病患是痊癒的，甚至沒有人出 現病情穩定的結果。這些病患的存活時間的中位數是4.8個月(從開 始接受療程算起)，少數人可以活到7個月後，不過腫瘤的大小也成 長了。這樣的結果和未受任何療程下的預期結果差不多。此外，有 數位病患出現氰中毒或是血中氰化物濃度過高的現像。 --

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