Sudeendra Doddi1
, Tarun Singhal1
, Collette De Silva1
, Frank Smedley1
, Prakash Sinha1
and Martin Leslie2 
1
Department of Surgery, Princess Royal University Hospital, Orpington, Greater London, BR6 8ND, UK
2
Department of Clinical Oncology, Princess Royal University Hospital, Orpington, Greater London, BR6 8ND, UK