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TumorDiagnostik & Therapie 2010; 31(5): 276-283
DOI: 10.1055/s-0029-1245742
Thieme current Oncology

© Georg Thieme Verlag KG Stuttgart · New York

Endoscopic ultrasound-guided fine-needle aspiration and trucut biopsy in the diagnosis of gastric stromal tumors: a randomized crossover study

G. Fernández-Esparrach1 , O. Sendino1 , M. Solé2 , M. Pellisé1 , L. Colomo2 , A. Pardo1 , G. Martínez-Pallí3 , L. Argüello4 , J. M. Bordas1 , J. Llach1 , A. Ginès1
  • 1Endoscopy Unit, Institut de Malalties Digestives i Metabòliques, Hospital Clínic, IDIBAPS, University of Barcelona, Spain
  • 2Pathology Department, Centre de Diagnòstic Biomèdic, Hospital Clínic, IDIBAPS, University of Barcelona, Spain
  • 3Anesthesiology Department, Hospital Clínic, IDIBAPS, University of Barcelona, Spain
  • 4Gastroenterology Department, Hospital La Fe, Valencia, Spain
Further Information

Publication History

15 April 2009

25 January 2010

Publication Date:
14 October 2010 (online)

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Background and aim: The diagnosis of gastrointestinal stromal tumors (GISTs) has important prognostic and therapeutic implications. The specific diagnosis of GIST has to be based on immunocytochemistry. This study aimed to prospectively compare in a crossover manner the accuracy of endoscopic ultrasound (EUS)-guided fine-needle aspiration (EUS-FNA) and EUS-guided trucut biopsy (EUS-TCB) in the specific diagnosis of gastric GISTs. We hypothesized that EUS-TCB is superior to EUS-FNA in this respect.

Patients and methods: Forty patients with gastric subepithelial tumors suspected on the basis of EUS of being a GIST underwent both EUS-FNA and EUS-TCB. The sequence in which the techniques were employed was randomly assigned to avoid bias.

Results: Forty tumors were sampled (mean number of passes: 2.1 ± 0.9 with EUS-TNB and 1.9 ± 0.8 with EUS-FNA; P = not significant, NS). Final diagnoses were: GIST (n = 27), carcinoma (n = 2), leiomyoma (n = 1), schwannoma (n = 1), and no diagnosis possible (n = 9). Device failure occurred in 6 patients with EUS-TCB. A cytohistological diagnosis of mesenchymal tumor (n = 29) and carcinoma (n = 2) was made in 70 % of cases by EUS-FNA and in 60 % of cases by EUS-TCB (P = NS). Among the samples that were adequate, immunohistochemistry could be performed in 74 % of EUS-FNA samples and in 91 % of EUS-TCB samples (P = 0.025). When inadequate samples were included, the overall diagnostic accuracy of EUS-FNA was 52 % and that of EUS-TCB was 55 % (P = NS). There were no complications.

Conclusions: EUS-TCB is not superior to EUS-FNA in GISTs because of the high rate of technical failure of trucut. However, when an adequate sample is obtained with EUS-TCB, immunohistochemical phenotyping is almost always possible. EUS-TCB can be safely performed in this set of patients.

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À. Ginès, MD, PhD

Endoscopy Unit
Institut de Malalties Digestives
Hospital Clínic

Villarroel 170
08036 Barcelona
Spain

Fax: Fax: + 34-93-2279387

Email: magines@clinic.ub.es

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