The present invention provides methods, compositions, and kits for the treatment of neurocutaneous syndromes, such as neurofibromatosis type I disorders associated with overactivation of FGFR3, such as achondroplasia； bone or cartilage disorders； or vascular smooth muscle disorders； or for the elongation of bone. Polypeptides having an alkaline phosphatase peptide fused to an Fc domain of an immunoglobulin or a natriuretic peptide fused to an Fc domain of an immunoglobulin can be administered to subjects, e.g., subcutaneously, to treat a neurocutaneous syndromes. The invention also features nucleic acid molecules encoding such polypeptides and the use of the nucleic acid molecules for treating neurocutaneous syndromes.
