Cancerthymus Share Tweet An organ that is part of the lymphatic system, in which T lymphocytes grow and multiply. The thymus is in the chest behind the breastbone.( THY-mus )Source: NCI Dictionary of Cancer TermsSearch the Glossary of Medical Terms Previous: thymoma Next: Thyrogen 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 Click to commentLeave a Reply Cancel replyYour email address will not be published.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