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Knowledge about the genetic defects that lead to cancer suggests that cancer can be treated by fixing those altered genes. One strategy is to replace a defective gene with its normal counterpart, using methods of recombinant DNA technology. Methods to insert genes into tumour cells and to introduce genes that alter the tumour microenvironment or modify oncolytic viruses to make them more effective are of particular interest. Specific agents are known to cause certain types of cancer, and cancer death rates might therefore be reduced through avoidance of those factors. One such preventative action is to avoid smoking tobacco. In ...(100 of 21846 words)