020 3311 1945

Adbo Ahmed, secretary


Dr John Martin was educated at Girton College, Cambridge and King’s College London. He trained as a gastroenterologist within north west London and obtained an MD investigating novel methods for colorectal cancer screening. He was appointed as a consultant in 2002 and moved to Charing Cross Hospital in 2006. He has a particular interest in screening for colorectal cancer and is director of the West London Bowel Cancer Screening Centre, based at Charing Cross. He has a passion for colonoscopy and performs advanced polypectomy as well as teaching colonoscopy both within the Trust and also at national screening centres. He is a Bowel Cancer Screening accredited colonoscopist and an examiner for BCSP colonoscopy accreditation. He runs a general gastroenterology clinic, treating patients with all luminal gastroenterological conditions, although has a special interest in inflammatory bowel disease.


Bowel cancer screening, therapeutic endoscopy, in particular advanced colonoscopy and polypectomy, IBD

Research & publications

UK flexible sigmoidoscopy screening trial investigators. (2002) Single flexible sigmoidoscopy screening to prevent colorectal cancer: baseline findings of a UK multicentre randomised trial. Lancet, 359, 1291-300  

Mahadeva, U., Martin, J.P., Patel, N.K. & Price, A.B. (2002) Granulomatous ulcerative colitis: a re-appraisal of the mucosal granuloma in the distinction of Crohn’s disease from ulcerative colitis. Histopathology, 41(1), 50-55  

Kutty, R.S., Westaby, D., Martin, J.P., Vlavianos, P. & Andreyev, H.J. (2007) What are the gastrointestinal endoscopic requirements of a cancer centre? Clin Oncol (R Coll Radiol), 19(5), 330-2. 

Graff, B. & Martin, J. (2011) Colorectal Cancer Screening. Trends in Urology & Men’s Health, September/October 26-30  

Poston, G. J., Tait, D., O’Connell, S., Bennett, A. & Berendse, S. on behalf of the Guideline Development Group (2011) Diagnosis and management of colorectal cancer: summary of NICE guidance. BMJ, 343, d6751   

Atkin, W. S., Edwards, R., Kralj-Hans, I., Wooldrage, K., Hart, A. R., Northover, J. & UK flexible sigmoidoscopy trial investigators. (2010) Once-only flexible sigmoidoscopy screening in prevention of colorectal cancer: a multicentre randomised controlled trial. Lancet, 375 (9726), 1624-1633  

Frilling, A., Smith, G., Clift, A.K. & Martin, J. (2014) Capsule endoscopy to detect primary tumour site in metastatic neuroendocrine tumours. Digestive and Liver Disease, Nov, 46(11), 1038-42  

Clift, A. K., Drymousis, P., Al-Nahhas, A., Wasan, H., Martin, J., Holm, S. and Frilling, A. (2015) Incidence of second primary malignancies in patients with neuroendocrine tumours. Neuroendocrinology, 21, 102(1-2), 26-32   

Clift, A.K., Faiz, O., Al-Nahhas, A., Bockisch, A., Liedke, M.O., Schloericke, E., Wasan, H., Martin, J., Ziprin, P., Moorthy, M. & Frilling, A. Role of staging in patients with small intestinal neuroendocrine tumours. Journal of Gastrointestinal Surgery, DOI 10.1007/s11605-015-2953-6

Private practice

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