"In this case, a tumor developed rather rapidly between two of these regular examinations," he said.

Some tumors develop malignant elements, which may change the treatment strategy.

Less commonly, these tumors can develop in adults as well.

Gene testing now allows a diagnosis before tumors or symptoms develop.

These tumors may develop at any time but two age groups are most at risk.

In later stages, tumors can develop a resistance to cancer treatment.

A tumor developed as an ulcer on her left cheek and the woman did not keep the wound covered.

As a tumor develops, you may note the following signs:

"Their tumors develop rapidly and have tremendous dissemination," he said.

That is, a second random mutation must occur before a tumor can develop.