Imperial College London


Faculty of MedicineDepartment of Surgery & Cancer

Honorary Clinical Senior Lecturer



+44 (0)20 3312 7657s.markar




Queen Elizabeth the Queen Mother Wing (QEQM)St Mary's Campus





From 2013 to 2016, I was awarded doctoral research fellowship by the National Institute for Health Research (NIHR) in the United Kingdom, through which I undertook my first PhD at Imperial College London. The subject was basic science focusing on non-invasive breath analysis of volatile organic compounds (breath test) for the diagnosis of gastro-intestinal cancer. From 2015 to 2018 I undertook my second PhD at Karolinska Institutet in Sweden, through which I developed further knowledge in clinical research in the surgical treatment of oesophageal cancer.

In 2016, I was awarded my first postdoctoral position with a NIHR Clinical Trials fellowship, to support my training in the design and conduct of randomised clinical trials /RCTs) at Imperial College London. Through this fellowship I was also able to work on an RCT comparing minimally invasive with open surgery for oesophageal cancer, which was published in New England Journal of Medicine. In 2017 I was appointed as NIHR Clinical Lecturer in Oesophago-Gastric Surgery at Imperial College London. The focus of my research became cancer survivorship, through which I coordinated three large multi-center European studies with recruitment of over 1000 oesophageal cancer survivors. I also continued my basic science research in breath test analysis as supervisor of PhD students, studying breath profiling of early oesophageal cancer and its premalignant lesion (Barrett’s oesophagus).  



Talavera-Urquijo E, Gantxegi A, Garbarino GM, et al., 2023, ESDE-MIE fellowship: a descriptive analysis of the first experiences., Dis Esophagus

Wen Q, Myridakis A, Boshier PR, et al., 2023, A complete pipeline for untargeted urinary volatolomic profiling with sorptive extraction and dual polar and nonpolar column methodologies coupled with gas chromatography time-of-flight mass spectrometry., Analytical Chemistry, Vol:95, ISSN:0003-2700, Pages:758-765

Antoniou SA, Florez ID, Markar S, et al., 2023, Author Correction: AGREE-S: AGREE II extension for surgical interventions: appraisal instrument., Surg Endosc, Vol:37

Schuring N, Jezerskyte E, van Berge Henegouwen MI, et al., 2023, Influence of postoperative complications following esophagectomy for cancer on quality of life: A European multicenter study., Eur J Surg Oncol, Vol:49, Pages:97-105

Leijonmarck W, Asplund J, Markar SR, et al., 2023, Weekday of gastrectomy and long-term survival in gastric adenocarcinoma., Eur J Surg Oncol, Vol:49, Pages:83-88

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