PhD defence S.A.V. (Stella) Nieuwenburg

Screening and Surveillance of the Gastrointestinal Tract

Prof. dr. V.M.C.W. Spaander


Prof. dr. E.J. Kuipers

Friday 24 Jun 2022, 10:30 - 12:00
PhD defence
Senate Hall
Erasmus Building
Campus Woudestein
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On Friday, 24 June 2022, S.A.V. Nieuwenburg will defend her PhD dissertation, entitled: ‘Screening and Surveillance of the Gastrointestinal Tract’.

Dissertation in short:

This thesis aims to optimise prevention programmes for gastric- and colorectal cancer.

The first part consists of studies on surveillance of premalignant gastric lesions. Prospectively, we evaluated current guidelines on the proper identification of patients with premalignant gastric lesions that deserve further follow up. After one extra gastro endoscopy – were guidelines would advise to stop further surveillance - it appeared that a considerable part would have an indication for further surveillance after all. We investigated several possibilities for the improvement of surveillance programmes. To name; the use of a new endoscopy technique, evaluating risk factors within patients (such as smoking and a family history of gastric cancer), and the new possibility of detecting the most important risk factor for the occurrence of gastric cancer – Helicobacter Pylori bacterium – in the fecal test used in colorectal cancer screening.  

The second part of this thesis consist of studies on colorectal cancer screening. First, the video capsule was used to determine prevalence rates of several abnormalities (benign or malignant) in a general population. Further, a comprehensive retrospective study in 20 European countries was performed on the incidence of colorectal cancer over time within different age groups. This showed that the incidence is increasing mostly at younger ages. Lastly, literature studies were performed in order to further improve and innovate the current colorectal cancer screening programme. We showed that the use of anticoagulants do not affect the fecal blood test used in screening. Also, the video capsule appeared to be a good alternative beside colonoscopy.

More information

The public defence will begin exactly at 10.30 hrs. The doors will be closed once the public defence starts, latecomers may be able to watch on the screen outside. There is no possibility of entrance during the first part of the ceremony. Due to the solemn nature of the ceremony, we recommend that you do not take children under the age of 6 to the first part of the ceremony.

A live stream link has been provided to the candidate.

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