Indicate true (T) and false (F) statements below regarding the properties of cancer cells. Your answer would be a four-letter string composed of letters T and F only, e.g. TFFF.
( ) Cancer cells invade and colonize territories that normally belong to other cells.
( ) Unlike in normal tissues, cell death is extremely rare in tumors.
( ) Cancer cells grow and proliferate in defiance of normal restraints.
( ) Malignant tumors are composed of cells that grow and proliferate, but still have not acquired invasiveness.