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癌瘤和白血病的病因学研究迄今仍可概括为四大主要因素,即遗传缺陷、病毒、化学物质与物理性照射。所谓病毒性因素,即特种病毒经过某特殊酶的作用进入细胞与 DNA 结合。这种 DNA 结合病毒的细胞,不只是可以继续分裂出类似的细胞,而且这种病毒在细胞内可以大量复制,又侵入其他正常细胞。这类细胞对其他致癌因素非常敏感,癌细胞大概就是由此突变而成。例如乙型肝炎病毒致患者发生乙型肝炎后,患者一旦食人染有黄曲霉菌
The etiology of cancer and leukemia so far can be summarized into four major factors, namely, genetic defects, viruses, chemical substances and physical exposure. The so-called viral factors, namely the special virus through a special enzyme into the cells and DNA binding. This DNA-binding virus does not just continue to divide out similar cells, but it can also replicate in large numbers in cells and invade other normal cells. Such cells are very sensitive to other oncogenic factors, cancerous cells are probably caused by mutations. For example, hepatitis B virus in patients with hepatitis B, the patient once ingested with Aspergillus flavus