--peripheral neuropathy symptoms are common among those with blood cancers, even before the chemotherapy regimens start (and these also can cause or exacerbate enuropathy symptoms).

The mechanisms are not completely understood, but have to do, it is thought, with autoimmune processes that cross react with components of peripheral nerve (blood cancers are at one level disorders of immune processes).

See:

http://neuromuscular.wustl.edu/nother/paraneo.htm

http://neuromuscular.wustl.edu/antibody/mprotein.htm