Dr Khoo trained at the University of Cambridge, received specialist accreditation in endocrinology and diabetes at St Bartholomew’s with Wellcome Trust Advanced Fellowship from 2003-2006. Since 2009, he has been senior clinical lecturer in endocrinology at University College London Medical School. Specialist interests are in the treatment of neuroendocrine tumors, as well as genetic endocrine disorders. He is the endocrinologist for the Royal Free London neuroendocrine tumour multidisciplinary team.

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