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癌肿的病因学和发病机理至今尚不清楚,但已有较多的研究证时某些因素和肿瘤的发生有明显的关系,如吸烟的人,肺癌发病率高;食用发霉稻米(含黄曲霉毒素)的人,易发生肝癌等。与其相似,常年工作在某些条件差的职业环境中是否也易于罹患癌肿?对于这个问题,要作出确切的、全面的结论尚存在一定的困难。这主要由于环境中除了职业因素外,尚存在其它非职业性(如自然)因素的影响。要解决以上问题,常采用以下方法:
The etiology and pathogenesis of cancer are still unclear, but there are many research evidence that when certain factors have a significant relationship with the occurrence of cancer, such as smoking, the incidence of lung cancer is high; eating moldy rice (yellow People with Aspergillus) are prone to liver cancer. Similar to this, whether the long-term work is also prone to cancer in some poorly-provided occupational environments, there are still some difficulties in making an exact and comprehensive conclusion on this issue. This is mainly due to the fact that in addition to professional factors in the environment, there are other non-professional (eg, natural) factors. To solve the above problems, the following methods are often used: