T-lymphocytes are the immune cells that can kill the cancer cells as well as virus cells.
T-lymphocytes are the type of lymphocytes that are synthesized in the bone marrow and develop in the thymus. They are of two types: Helper T cells and Cytotoxic T cells. Cytotoxic T cells are the ones that have the ability to kill virus and cancer cells.
Cancer is the disease where the cells get mutated and start to divide uncontrollably. The dividing mass of cells is called tumor. And when this tumor starts to move to the other parts of the body it takes the form of cancer.
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