PURPOSE: To investigate whether genotypic differences can be identified between MS patients who develop liver injury compared to those who do not develop injury in response to beta-interferon therapy.
OBJECTIVE: To determine whether elevated liver enzyme tests (ALT > 5 times the upper limit of normal) in response to beta-interferon therapy in MS patients is associated with genetic polymorphisms.
METHOD OF RECRUITMENT:
Patients will be identified through a clinic database and chart reviews. An introductory letter will be mailed to potential participants, inviting them to volunteer. A follow-up phone call will be made to determine interest and consent into study.
PROCEDURES:
Saliva will be collected for genetic analyses and a questionnaire will be administered