Theoritically we can divide malignant tumours progression and behavior according to the difference between their malignant cells mitosis and apoptosis .
1. Tumors with regression and Excellent prognosis
If apoptosis is more than mitosis.
2. Tumors with stationary state and Good prognosis
Lymphocytic infiltration in malignant tissue is good example of tumor immunity which can increase apoptosis and decrease tumor progression. It is proven to be a good prognostic factor.
Also chemotheraputic drugs which reduce malignant cell division and decrease mitosis is widly used for ttt of leukemias in children with good prognostic results.