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探讨血清叶酸水平与肺癌的关系，本文通过测定已确诊肺癌患者血清及肺部良性疾病患者血清叶酸进行比较发现肺癌组血清叶酸水平明显低于肺部良性疾病组（Ｐ＜０．０５），肺癌各细胞类型之间的血清叶酸无差异。
To explore the relationship between serum folic acid and lung cancer, the authors found that serum folic acid levels in lung cancer patients were significantly lower than those in lung benign disease group (P<0.05). There was no difference in serum folic acid between cell types.