Cancersecond-degree relative Share Tweet An aunt, uncle, grandparent, grandchild, niece, nephew, or half-brother or -sister. Also called SDR.( SEH-kund-deh-GREE REH-luh-tiv )Source: NCI Dictionary of Cancer TermsSearch the Glossary of Medical Terms Previous: second primary cancer Next: second-line therapy NewsletterSign up for the QuackTrack.org newsletter below! Click to commentLeave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment *Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Δ QuackTrack on TwitterTweets by QuackTrack_org Trending Posts