Incidence of sarcoma histotypes and molecular subtypes in a prospective epidemiological study with central pathology review and molecular testing

Françoise Ducimetière, Antoine Lurkin, Dominique Ranchère-Vince, Anne-Valérie Decouvelaere, Michel Péoc'h, Luc Istier, Philippe Chalabreysse, Christine Muller, Laurent Alberti, Pierre-Paul Bringuier, Jean-Yves Scoazec, Anne-Marie Schott, Christophe Bergeron, Dominic Cellier, Jean-Yves Blay, Isabelle Ray-Coquard, Françoise Ducimetière, Antoine Lurkin, Dominique Ranchère-Vince, Anne-Valérie Decouvelaere, Michel Péoc'h, Luc Istier, Philippe Chalabreysse, Christine Muller, Laurent Alberti, Pierre-Paul Bringuier, Jean-Yves Scoazec, Anne-Marie Schott, Christophe Bergeron, Dominic Cellier, Jean-Yves Blay, Isabelle Ray-Coquard

Abstract

Background: The exact overall incidence of sarcoma and sarcoma subtypes is not known. The objective of the present population-based study was to determine this incidence in a European region (Rhone-Alpes) of six million inhabitants, based on a central pathological review of the cases.

Methodology/principal findings: From March 2005 to February 2007, pathology reports and tumor blocks were prospectively collected from the 158 pathologists of the Rhone-Alpes region. All diagnosed or suspected cases of sarcoma were collected, reviewed centrally, examined for molecular alterations and classified according to the 2002 World Health Organization classification. Of the 1287 patients screened during the study period, 748 met the criteria for inclusion in the study. The overall crude and world age-standardized incidence rates were respectively 6.2 and 4.8 per 100,000/year. Incidence rates for soft tissue, visceral and bone sarcomas were respectively 3.6, 2.0 and 0.6 per 100,000. The most frequent histological subtypes were gastrointestinal stromal tumor (18%; 1.1/100,000), unclassified sarcoma (16%; 1/100,000), liposarcoma (15%; 0.9/100,000) and leiomyosarcoma (11%; 0.7/100,000).

Conclusions/significance: The observed incidence of sarcomas was higher than expected. This study is the first detailed investigation of the crude incidence of histological and molecular subtypes of sarcomas.

Conflict of interest statement

Competing Interests: The authors would like to specify that Dr. Dominic Cellier is the scientific relationship director of Merck-Serono. Merck-Serono provides financial support. The authors confirm that this does not alter their adherence to all the PLoS ONE policies on sharing data and materials.

Figures

Figure 1. The French ADICAP coding system…
Figure 1. The French ADICAP coding system (http://www.adicap.asso.fr/).
Figure 2. Selection of patients eligible for…
Figure 2. Selection of patients eligible for inclusion.
Figure 3. Age-specific incidence rates (per 100,000).
Figure 3. Age-specific incidence rates (per 100,000).
(A) Age-specific rates by sarcoma type. (B) Age-specific rates within bone sarcomas, for the 3 most important histotypes. (C) Age-specific rates for liposarcoma subtypes.

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