Aspirin in gastrointestinal oncology: new data on an old friendLangley, Ruth E.a; Rothwell, Peter M.bCurrent Opinion in Oncology: July 2014 - Volume 26 - Issue 4 - p 441–447 doi: 10.1097/CCO.0000000000000098 GASTROINTESTINAL TRACT: Edited by Alain Hendlisz Abstract Author Information Purpose of review The purpose of this review is to assess recent evidence that demonstrates that aspirin has the potential to be an effective preventive and therapeutic agent in gastrointestinal malignancy. Recent findings Long-term follow-up of previous randomized trials of aspirin show that it decreases cancer incidence and mortality with the greatest effects seen on cancers that arise from the gastrointestinal tract. Reduction in distant metastasis and improvements in cancer outcomes appear within 5 years of randomization indicating that aspirin affects tumour growth or the development and spread of metastases from existing cancers or both. In Lynch syndrome (hereditary nonpolyposis colon cancer), aspirin reduces cancer incidence and should be considered standard care. Mutations in the PIK3CA gene may be a potential predictive marker of response to aspirin after a cancer diagnosis, though pharmacological considerations suggest that platelets may be central to the antitumour efficacy of aspirin. Summary These findings have re-awakened interest in the role of aspirin in the primary prevention of cancer and in the treatment of cancer. Randomized controlled trials are underway to assess the role of aspirin within the treatment algorithms of several solid common cancers. aMRC Clinical Trials Unit at University College London, London bOxford Stroke Prevention Research Unit, Oxford University Clinical Academic Graduate School, Oxford, UK Correspondence to Professor Peter M. Rothwell, Director, Oxford Stroke Prevention Research Unit, Oxford University Clinical Academic Graduate School, Level 6, West Wing, John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK. Tel: +44 1865 231610; fax: +44 1865 231534; e-mail: email@example.com © 2014 Lippincott Williams & Wilkins, Inc.