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肝癌病因及风险因素
病毒性肝炎与肝癌：
病毒性肝炎与肝癌有关系的已涉及乙型（ HBV ）、丙型（ HCV ）与丁型（ HDV ） 3 种。尽管 HBV与肝癌的关系已研究多年，目前仍仅是一些线索提示其与肝癌关系密切。如发现 HBV 变种，尤其我国肝癌高发区发现一些不寻常的 HBV变种；另外发现 HBV 的 X 基因与癌变有关；土拨鼠研究提示 HBV 在致肝癌中起直接作用；又发现 HBV-DNA 的整合与
N-ras 癌基因的激活有关，等等。
黄曲霉毒素与其他因素
自从 60年代发现黄曲霉毒素以来，已一再在动物实验中证实黄曲霉毒素可诱发肝癌，但黄曲霉毒素与人类肝癌的关系主要来自流行病学的证据。我国资料曾一再提示肝癌高发于潮湿地带，尤其是食 用玉米、花生多的地区。值得重视的是不少资料提示黄曲霉毒素与
HBV 有协同作用。
饮水污染与肝癌
我国通过大量流行病学调查已一再发现饮水污染与肝癌的发生密切相关。在肝癌高发区如江苏省启东县和海门县、上海的南汇县、广西的扶绥县等均提示饮用宅沟水、塘 水者其肝癌死亡率明显高于饮用井水者，尤其饮用深井水者肝癌死亡率最低。至于水中的致癌物质，目前尚未完全 弄清。近年由于水质分析技术的进步，已发现水中有百余种有机物为致癌、促癌和致突变物。饮水中的有机致癌物 有：六氯苯、苯并芘、多氯联苯、氯仿、二溴乙烷、二溴乙烯等。

肝癌分子生物学研究
肝癌的分子生物学研究是近年迅速发展起来的一个崭新领域，它对肝癌的发生、发展及其与乙型肝炎病毒的关系等 提供了新的材料，目前研究较多的为肝癌的癌基因、抑癌基因以及与HBV的关系方面。
互相制约的原癌基因和抑癌基因的细胞增殖、分化、组织再生和个体发育所须的。癌症是由于病毒或化学致癌物的 作用使原癌基.

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[size=10pt]Pearlove Jewelry Inc[/size][size=10pt]., Chinese online wholesale jewelry store, is a professional wholesaler and supplier of Chinese cultured pearls. All pearls are directly from pearl farms in China.

Pearlove’s pearl farm lies in Liusha harbor, Zhangjiang, where are known as "County of Akoya pearls"; It is professionally engaged in the pearl breeding, pearl deep process, pearl grading, pearl string and pearl production. Pearlove sells pearls in mainland China and Hong Kong, and begun to export and wholesale pearl strands and jewelries directly from family pearl farms via the Internet from 2007. Pearlove culture pearls in its own pearl farm and make jewelries in its own factory, so pearlove can offer the world's finest pearls with most reasonable prices.

Now Pearlove’s online jewelry store mainly wholesale freshwater & Akoya pearl jewelry --- [/size][size=10pt]pearl necklaces[/size][size=10pt], [/size][size=10pt]pearl bracelets[/size][size=10pt], earrings, pendants, and rings, coral jewelry, turquoise jewelry, crystal, jade, shell jewelry and [/size][size=10pt]gemstone jewelry[/size][size=10pt]. Most of the jewelries are handmade. The online jewelry store also offers jewelry raw materials - freshwater pearls, Akoya pearl beads & strands, coral beads, turquoise, shell beads, jewelry fittings, jewelry making kits.

Pearlove Jewelry has own jewelry designers and keep continuing to design new jewelry styles --- Crystal jewelry; pearl jewelry, bridal jewelry, Christmas pearl jewelry, and beautiful party pearl jewelry. Customized jewelry designs are welcome as well.

In Chinese pearl jewelry industry, Pearlove is not enough a big guy, but the Professional Foreign Trade, Good English Communication, Product Quality, Competitive Price and On-time Delivery earn Pearlove the reputation from our clients all over the world. Pearlove’s faith is to provide as best service as possible for all clients [/size]

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