Disclosed herein are synthetic peptides and compositions comprising the same for the treatment and/or prophylaxis of a disease or a condition related to dry eye syndrome, psoriasis vulgaris or multiple myeloma. Also disclosed herein are methods of treating and/or preventing a disease or a condition related to dry eye syndrome, psoriasis vulgaris or multiple myeloma, by administering to a subject in need of such treatment a composition containing a therapeutically effective amount of a synthetic peptide of the present disclosure.