Your mother has undergone five major chemotherapy treatments, so it should be said that the treatment is over. As long as you pay more attention to maintenance, increase nutrition and prevent immunity from declining, there should be no big problem.
Don't worry even if your illness is repeated in the future. Go to the hospital regularly, even if you do chemotherapy again, it may be once every six months or once a year.
After the cure, there is nothing special different from normal people, but you may need to take some medicine.
Therefore, although M3 suffers from leukemia, he is lucky.
Finally, I wish your mother a speedy recovery.