The Clinical and Socio-Economic Relevance of Increased IPMN Detection Rates and Management Choices.
BACKGROUND
Increased usage of computed tomography and magnetic resonance imaging has led to a large increase in identified pancreatic cysts of up to 25% in population-based studies. The clinical and economic relevance of identifying so many cystic lesions has not been established. Compared to other organs such as liver or kidney, dysontogenetic pancreatic cysts are rare. Pancreatic cysts comprise a variety of benign, premalignant or malignant lesions; however, precise diagnosis before resection has an accuracy of only 80%. The focus of recent research was the malignant potential of intraductal papillary mucinous neoplasms (IPMN) with the aim of establishing clinical pathways addressing risk of malignancy, age and comorbidity, treatment-related morbidity and mortality as well as cost-effectiveness of treatment and surveillance. The focus of this review is to analyze the clinical and socio-economic relevance as well as the cost-benefit relation for IPMNs.


METHODS
For analysis, the following MESH terms were used to identify original articles, reviews, and guidelines in PubMed: ('intraductal papillary mucinous neoplasm' OR 'pancreatic cysts') and (incidence OR relevance OR socio-economic OR economic OR cost-effectiveness OR cost-benefit). The retrieved publications were reviewed with a focus on clinical and socio-economic relevance in relation to the increasing incidence of IPMN.


RESULTS
Addressing the increasing prevalence of pancreatic cystic lesions, recent consensus guidelines suggested criteria for risk stratification according to 'worrisome features' and 'high-risk stigmata'. Recent prospective cohort studies evaluated whether these can be applied in clinical practice. Evaluation of three different clinical scenarios with regard to costs and quality-adjusted life years suggested a better effectiveness of surveillance after initial risk stratification by endoscopic ultrasound-guided fine-needle aspiration with cyst fluid analysis compared with immediate resection or follow-up without further intervention. Of interest, the 'immediate surgery' strategy was lowest for cost-effectiveness.


CONCLUSIONS
The increasing incidence of identified pancreatic cysts requires an improved strategy for non-invasive risk stratification based on advanced imaging strategies. In light of a malignancy risk of 2% for branch-duct IPMN, the socio-economic necessity of a balance between surveillance and resection has to be agreed on.
Department of Medicine A, University Medicine, Ernst Moritz Arndt University Greifswald, Germany.
Christoph
C
Budde
Department of Medicine A, University Medicine, Ernst Moritz Arndt University Greifswald, Germany.
Georg
G
Beyer
Institute of Radiology, University Medicine, Ernst Moritz Arndt University Greifswald, Germany.
Jens-Peter
JP
Kühn
Department of Medicine A, University Medicine, Ernst Moritz Arndt University Greifswald, Germany.
Markus M
MM
Lerch
Department of Medicine A, University Medicine, Ernst Moritz Arndt University Greifswald, Germany.
Julia
J
Mayerle
Cost-effectiveness; ICER; IPMN; Incremental cost-effectiveness ratio; Intraductal papillary mucinous neoplasm; Pancreatic cystic lesion; QUALI; Quality-adjusted life years