1. Why are cancer cells or abnormal cells used in tissue cultures even when researchers are not studying-cancer

Well, there are always researchers studying cancer, but as the question is asking otherwise, it must be answered.

Cancer Cells can multiply in culture (outside of the body in a dish) without any growth factors, or growth-stimulating protein signals being added. This is different from normal cells, which need growth factors to grow in culture.

-Mabel <3