Sahlgrenska Cancer Center, Department of Pathology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, PO Box 425, SE-405 30, Gothenburg, Sweden.|Sahlgrenska Cancer Center, Department of Oncology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, PO Box 425, SE-405 30, Gothenburg, Sweden.|Swedish Hip Arthroplasty Register, Centre of Registers Västra Götaland, Gothenburg, PO Box 425, SE-405 30, Gothenburg, Sweden.|Sahlgrenska Cancer Center, Department of Pathology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, PO Box 425, SE-405 30, Gothenburg, Sweden. helena.caren@gu.se.