Haemophilia A results from a congenital deficiency of clotting factor VIII and has an incidence of approximately 1 in 5000 live male births [1]. Patients with access to modern haemophilia care now have improved life expectancy, and will probably experience age-related diseases such as cancer. Many types of malignancy have been reported in persons with haemophilia, irrespective of infection with HIV and hepatitis C; yet prevalence and incidence rates compared with the general population remain unknown. In a recent retrospective literature review of cancer in patients with haemophilia, conducted through Medline articles published between January 1966 and July 2009, 32 cases of leucaemia were identified as well as 159 malignant solid tumours [1]. Specific incidence and prevalence rates could not be calculated due to the limited nature of the information available in the reports.Hematopoietic stem cell transplantation (HSCT) is today an established treatment strategy not only for cancer but also for cure of inborn errors of metabolism or immune system [2]. Although HSCT is not considered a therapeutic option for patients with haemophilia, we describe the clinical course and the outcome of an adolescent with haemophilia in whom HSTC was applied for treatment of relapsed anaplastic large cell lymphoma (ALCL).A. K. was diagnosed with haemophilia A at 18 months in his country (Albania), and treated with blood transfusion and cryoprecipitate. At the age of 6 years, following immigration in Italy, he was put on FVIII therapy. At the age of 12 years he developed a painful scapular mass. Following MR and CT imaging study, he underwent complete resection of the tumour; histological diagnosis of extraosseous EwingĂs sarcoma was made. He was treated, according to the ISG-SSG IV protocol, chemotherapy followed by consolidation with autologous HSCT [3]. Eighteen months after completion of chemotherapy, he developed systemic lymphadenomegaly; histological diagnosis of anaplastic large cell lymphoma (ALCL) was made, and treatment according with the EICNHL protocol for relapsed ALCL was started [4]. After three chemotherapy blocks, he was given highdose chemotherapy with allogeneic HSCT for consolidation of second remission. The conditioning regimen included: Thiotepa 10 mg/kg, Etoposide 40 mg/kg and TBI 12 Gy. The source of HSC was an unrelated cord blood unit; HLA match was 4/6; a total of 2 · 10 5 /kg CD34 cells were infused. Due to his co-morbidity, during the entire transplant phase platelets were infused every other day, aiming at count >30 000/mm 3 , as well as rhFVIII, 1000 IU every 12 h. On day +12, he developed Pseudomonas aeruginosa and Klebsiella pneumonia septicemia. Stable engraftment was documented for neutrophils (>500/ mm 3 ) since day +30, and for platelets (>50 000/mm 3 ) since day +42. On day +44, he was readmitted for hemorrhagic cystitis treated with hyperhydration. On day +65, VNTR analysis documented complete donor chimerism. His clotting tests, including FVIII plasma levels, were similar to his pretransplant...