Congregation Beth Tikvah in Hoffman Estates is partnering with Be The Match and City of Hope to search both domestically and internationally for a stem-cell match for one of its members, Aaron Lee.

Lee is battling Stage IV non-Hodgkins Lymphoma and is undergoing aggressive chemotherapy; he also requires a stem-cell transplant.

Beth Tikvah is asking for help from the community and will hold a bone marrow registration event from 1 to 3 p.m. Sunday, Nov. 20, at Beth Tikvah, 300 Hillcrest Blvd., Hoffman Estates. Those interested in participating can also join the registry online .