Even secondhand smoke can increase the risk of cells becoming cancerous.

We need to be able to find cells that are abnormal but have not yet become cancerous.

In this compromised environment, cells that have become cancerous are allowed to proliferate.

The lesion may be removed and examined if there is a possibility it has become cancerous.

The only human cells that grow indefinitely in culture now are ones that have taken the first steps toward becoming cancerous.

Today, the relationship between political fund-raising and government operations has become corrosive and cancerous.

While most are non-cancerous, some moles have a higher risk of becoming cancerous.

Also, sun exposed areas of the tongue, lips and eyes have an increased risk of becoming cancerous.

Most adenomas remain benign; each year only 5 in 2,000 become cancerous, a transformation that occurs on average over 10 years.

Human cells must generally disrupt a series of their growth control genes before becoming cancerous.