A method of treating, controlling or preventing development of an inflammatory neuropathological disease or condition, the method comprising measuring the level of a TAM receptor ligand in a subject and comparing the level to a control, the control being a level from a normal, healthy subject or population of subjects or a level from the same subject as being treated taken at an earlier time point, and if the level of the TAM receptor ligand is altered compared to the control administering to the subject an effective amount of an agent selected from the group consisting of:
- (i) interferon β or another immunomodulatory agent which influences the clinical course of the inflammatory neuropathological disease or condition;
- (ii) an agent which reduces demyelination leading to a reduction in plasma levels of the TAM receptor ligand;
- and
- (iii) an agent which normalizes levels of the TAM receptor ligand while inducing or exacerbating inflammatory neuropathology.