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观察移民中肿瘤发病(死亡)率的改变,是肿瘤流行病学研究的一种方法。移民的遗传性相对稳定,而居住的环境发生变化,特别是在同一地区内比较不同来源的移民人群的癌谱,将有助于鉴别某种肿瘤与遗传因素或
Observing changes in the incidence (death) rate of cancer in immigrants is a method of tumor epidemiology. The hereditary nature of immigrants is relatively stable, and the environment in which they live has changed, especially comparing the cancer profiles of immigrants from different sources in the same area, which will help identify certain tumors and genetic factors or