Dr Karen Breen is a consultant haematologist with a specialist interest in thrombosis and is Clinical Director of Haematology and supporting services at Guys and St.Thomas’ NHS foundation Trust.

She trained in haematology in Ireland and moved to the UK to conduct research in antiphospholipid syndrome leading to an MD.

Her main area of clinical interest is in thrombosis, she helping to set up and run a PERT service and works closely with the Venous vascular service in managing venous interventions at GSTT. She is currently involved in several clinical trials and in translational research in antiphospholipid syndrome.