Question

Which one of these is characteristic of cancer cells?

Answer 1

Cancer cells are cells that grow and divide at an unregulated, quickened pace. Although cancer cells can be quite common in a person they are only malignant when the other cells (particularly natural killer cells) fail to recognize and/or destroy them. In the past a common belief was that cancer cells failed to be recognized and destroyed because of a weakness in the immune system. However, more recent research has shown that the failure to recognize cancer cells is caused by the lack of particular co-stimulated molecules that aid in the way antigens react with lymphocytes (a type of white blood cell in the vertebrate immune system).

Answer 2

I didn't know how to answer your question (were there choices to choose from?) So I just posted a response describing brief characteristics of cancer cells.

Answer 3

I believe i know of which Co-stimulated molecule you mentioned, CD80. I however only recall reading publications that concluded it had association with prolonged survival of cancer patients (of a few cancer types).
If this is not the Co-stimulant you've refered to, could you please clarify which one you mean?