BACKGROUND: Patient-derived xenografts (PDX) mice models play an important role in preclinical trials and personalized medicine. Sharing data on the models is highly valuable for numerous reasons - ethical, economical, research cross validation etc. The EurOPDX Consortium was established 8 years ago to share such information and avoid duplicating efforts in developing new PDX mice models and unify approaches to support preclinical research. EurOPDX Data Portal is the unified data sharing platform adopted by the Consortium. MAIN BODY: In this paper we describe the main features of the EurOPDX Data Portal ( https://dataportal.europdx.eu/ ), its architecture and possible utilization by researchers who look for PDX mice models for their research. The Portal offers a catalogue of European models accessible on a cooperative basis. The models are searchable by metadata, and a detailed view provides molecular profiles (gene expression, mutation, copy number alteration) and treatment studies. The Portal displays the data in multiple tools (PDX Finder, cBioPortal, and GenomeCruzer in future), which are populated from a common database displaying strictly mutually consistent views. (SHORT) CONCLUSION: EurOPDX Data Portal is an entry point to the EurOPDX Research Infrastructure offering PDX mice models for collaborative research, (meta)data describing their features and deep molecular data analysis according to users' interests.

Candiolo Cancer Institute FPO IRCCS S P 142 km 3 95 10060 Candiolo TO Italy

Department of Oncology University of Torino 10060 Candiolo TO Italy

European Molecular Biology Laboratory European Bioinformatics Institute Wellcome Trust Genome Campus Hinxton Cambridge CB10 1SD UK

Institute of Computer Science Masaryk University Šumavská 15 60200 Brno Czech Republic

Kairos3D via Agostino da Montefeltro 2 10134 Turin Italy

The Jackson Laboratory 600 Main Street Bar Harbor ME 04609 USA

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