Moreover, the dose of carcinogen needed to initiate the process that forms malignant tumors years later was found to be less than one-thousandth the dose required to mutate any specific gene.

• 尤有甚者，研究还发现：造成多年后恶性肿瘤生成的致癌物质剂量，要比引发任何特定基因突变所需剂量的1/1000还低。