Dr.Karen Breen is a Consultant Haematologist with a Specialist interest in Thrombosis. Her undergraduate training was at Trinity College, Dublin and postgraduate training including in Haematology were in Ireland before moving to the UK to conduct research leading to an MD.

She is a member of the Royal College of Physicians of Ireland and Royal College of Pathologists, UK. She is currently involved in several clinical trials and in translational research in the Antiphospholipid syndrome and has authored and co-authored on publications on the thromboembolic disease. She is also lead to the acute management of thrombosis and anticoagulation and a member of the Trust Thromboprophylaxis and Thrombosis Committee at Guys and St.Thomas' Foundation Trust. She has authored several research papers and lectures nationally and internationally on a regular basis.

It is important that HCA is transparent about our relationship with those doctors who provide us with clinical guidance on delivering the best possible care to patients and operating our hospitals safely and efficiently. We set out here some of the ways in which we work together and the amount we pay this doctor for such services.