According to some literature, cancer cells exhibit abnormalities in terms of cell proteins and DNA expression, so the main problem lies with the DNA eventually. In general, cancer drugs tend to stop the cell cycle (eventually destroying the cells) and damage normal cells as well, or target cancer cells specifically or a certain abnormal DNA/protein transcription. The question is: if we managed to get a normal (healthy) DNA inside the cancer cell, would that mean that the cancer cell would become normal again (as normal gene expression overcomes abnormal gene expression usually)? What would happen to the abnormal DNA?

I work with the drug delivery division, so I might be missing some key words to explain the cancer cell abnormalities.