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　　美国研究人员４日在新一期美国《国家科学院学报》上发表论文指出，给患有癌症的实验鼠注射大剂量的维生素Ｃ，可以明显减缓肿瘤生长。
　　来自美国国家卫生研究所的一个科研小组介绍说，肌体内很多关键酶都需要维生素C才能正常工作，长期缺乏维生素C可能导致坏血病。
      维生素C还起到抗氧化剂的作用，能保护细胞免受自由基的危害。但是他们发现，当维生素C被大剂量注入实验鼠体内时，反而会起到“促氧化剂”的作用，导致形成过氧化氢，它可以杀死癌细胞。
　　研究小组负责人马克·莱文等人最初对43种癌症细胞系和5种正常细胞系进行的实验显示，高浓度的维生素C对75%的癌细胞系都有抑制效果，并且不会影响正常的细胞系。他们随后用患癌实验鼠进行实验并发现，大剂量注射维生素C可使肿瘤重量和生长速度分别降低41%和53%。
　　研究人员分析认为，维生素C之所以有抗癌功效，是由于它能在围绕癌细胞的细胞外液中促使形成过氧化氢，正是过氧化氢杀死了一些癌细胞。
　　研究小组称，这些动物实验数据表明，应该继续推进维生素C在人类癌症治疗领域的应用。医学界早年曾一度掀起研究用维生素C治疗癌症的热潮，后来由于有些临床试验得出结论认为，口服高剂量维生素C对于癌症患者没有明显益处，研究热潮逐渐降温。而莱文等人指出，只有通过注射，人体内的维生素C才能达到可发挥抗癌效果的水平。他们已经在设计新的人体临床试验，以进一步研究维生素C在人体中的抗癌功效。

==== 汉译英 ====
U.S. researchers on the 4th in the new one the United States, "National Academy of Sciences," published a paper that the mice injected with cancer to high doses of vitamin C, can significantly slow tumor growth.
From the U.S. National Institutes of Health, a research team said that many of the key enzyme in the body needs vitamin C to work properly, long-term lack of vitamin C can cause scurvy.
Vitamin C also plays the role of antioxidants can protect cells from free radical damage. But they found that when large doses of vitamin C were injected into mice, when the contrary, it will play "and promoting oxidant" effect, leading to the formation of hydrogen peroxide, which can kill cancer cells.
Research team leader, who was originally Macle text of 43 types of cancer cell lines and 5 normal cell lines experiments showed that high concentrations of vitamin C for 75% of the cancer cell lines have a suppression effect, and will not affect the normal The cell lines. They then experiment with the cancer in mice and found that injection of large doses of vitamin C will enable tumor weight and growth rate were decreased by 41% and 53% respectively.
The researchers analyzed that the reason why there are anti-cancer effects of vitamin C is due to it in the extracellular fluid surrounding the cancer cells to promote the formation of hydrogen peroxide, hydrogen peroxide is to kill some cancer cells.
Research team, said the experimental data show that these animals should continue to promote the vitamin C in human cancer treatment fields. Early medical research, once set off an upsurge of vitamin C to treat cancer, and later because some clinical trials, concluded that oral administration of high doses of vitamin C in cancer patients with no obvious benefit, research has gradually cooling down. But Levin, who pointed out that only through injection, the body of vitamin C can play to achieve the level of anti-cancer effects. They are already in the design of new human clinical trials to further study of vitamin C in the body of the anti-cancer effects.