1. Department of Pathology and
2. Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, NY;
3. Unité Mixte de Recherche (UMR)1170, INSERM and Institut Gustave Roussy, Villejuif, France;
4. Sorbonne Universités, UPMC/Paris 06, UMR-S INSERM U1135, Centre National de la Recherche (CNRS) ERL 8255, Centre d’Immunologie et Maladies Infectieuses, Paris, France;
5. Assistance Publique–Hôpitaux de Paris (AP-HP), University Hospital La Pitié-Salpêtrière, Department of Internal Medicine, Centre de Référence des Histiocytoses, Paris, France;
6. Department of Immunology, AP-HP Pitié Salpêtrière, Paris, France;
7. EA4340, Versailles University, Paris-Saclay University, Boulogne, France;
8. Pathology Service, Hôpital Universitaire Ambroise Paré, AP-HP, Boulogne, France;
9. Leukemia Service, Department of Medicine, and
10. Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, NY;
11. Department of Pathology, New York University School of Medicine, New York, NY;
12. Department of Internal Medicine, AP-HP, University Hospital Bichat, Paris, France;
13. Department of Pathology, University Hospital La Pitié-Salpêtrière, Paris, France; and
14. INSERM UMR-S1147, CNRS SNC5014, Paris Descartes University, Paris, France