People with MS who were given the chemotherapy drug Mitoxantrone (marketed as Novantrone for MS) were followed for 15 yrs. after treatment. Patients had 10 times higher rates of leukemia than untreated, 3 times higher colorectal cancer than untreated, and 5.5% (37 out of 676) of those who had used Novantrone developed some form of cancer. http://www.neurology.org/content/early/2016/05/11/WNL.0000000000002745.full.pdf+html

Please ask questions before accepting any cytotoxic/ chemotherapy treatment for MS (Lemtrada, Ocrelizumab, Cytoxan, Rituxan)
We still do not understand the disease mechanism of MS. While MS specialists continue to operate under the assumption that a faulty immune system must be annihilated; recent research asserts progression of MS and disability is linked to neurodegeneration, or brain atrophy. There is a terrible and tragic irony in the fact that some chemotherapies are shown to double brain atrophy rates. Joan
For more published research on what chemotherapy does to myelin, neurons and the brain: http://ccsviinms.blogspot.com/2014/03/chemotherapy-causes-brain-atrophy.html