Abstract: Dermal neurofibroma, in particular Neurofibromatosis Type I (NF1) leads to progressive tumor proliferation with no known mechanism to inhibit growth. The present invention relates to the use of photodynamic therapy (PDT) for attenuating tumor growth in NF1 patients. More particularly the invention provides a method of treating dermal neurofibroma comprising topically applying a pharmaceutical composition comprising a photosensitizer to the affected area of a patient, incubating the affected area, and irradiating the affected area with a light of suitable wavelength as per the photosensitizer used, wherein the treatment is characterized by inhibiting the progression of tumor growth and/or reduction in tumor size and/or increased mortality rate of the neurofibroma cell.

Abstract: Provided are methods for modulating activity of the immune system using agonists or antagonists of CD200 pr CD200R. Also provided are methods of treatment and diagnosis of immune disorders.