[Haematological malignancies (HM) in Basse-Normandie (BN): incidence and clinical and biological characteristics over the period 1997-2005 in patients less than 25 years old]. / Épidémiologie des hémopathies malignes en Basse-Normandie : incidence et caractéristiques cliniques et biologiques chez l'enfant et l'adulte jeune de moins de 25ans (1997-2005).

BACKGROUND: The study was designed to present the incidence of all the haematological malignancies (HM) in Basse-Normandie (BN) over the period 1997 to 2005 in patients less than 25 years old. BN is an administrative region in the North-West of France, composed of three departments: Calvados, Manche and Orne. We extracted data from the Registre régional des hémopathies malignes de Basse-Normandie, a French registry which belongs to the Association of the French Cancer Registries (Francim). METHODS: All the HM were coded using the third edition of the International classification for oncologic diseases (ICD-O-3). We compared the clinical and biological descriptive data in patients less than 15 years old to those of young adults (15-24 years old). RESULTS: A total of 305 new cases of HM were recorded over the period 1997 to 2005. HM were more frequent in men (168 cases) than in women (137 cases). Patients less than 25 years old accounted for 4.1% of all HM cases, whereas patients less than 15 years old and young adults (15-24 years old) represented 2.2% and 1.9% of all cases, respectively. In patients less than 25 years old, the overall world-standardized incidence rates (WSR) were 7.67/100,000 (95% CI: 6.31-9.04) in BN (8.08 [6.15-10.02] for men and 7.24 [5.31-9.17] for women). In patients less than 15years, the overall WSR was 7.38/100,000 (6.23-8.52), with no difference between boys (7.57) and girls (7.17). Acute lymphoblastic leukaemia (ALL) was the most frequent HM, WSR=4.02/100,000 (3.16-4.88) (4.30 [3.08-5.53] in men, 3.73 [2.52-4.93] in women), with similar clinical and biological criteria between patients less than 15 years and young adults. In young adults, the overall WSR was 8.21/100,000 (7.47-8.96), similar between men and women (9.02 [7.93-10.12] and 7.37 [6.35-8.38], respectively). Their highest WSR was obtained for Hodgkin lymphomas (HL): 3.37/100,000 (2.89-3.85), similar between men (3.49 [2.8-4.17]) and women (3.25 [2.58-3.93]). The study did not show any significant difference between the Calvados, Manche and Orne departments (except for HL, which seems more frequent in Manche department for 15-24 years old cases). There was no evidence of an increased risk for ALL in the subdistricts Beaumont-Hague and Les Pieux, which respectively have a nuclear waste reprocessing plant and a nuclear power plant on their territory. The subtype of HM was dependent on age whereas clinical and biological data were the same, whatever the age. CONCLUSION: These results contribute to HM monitoring in an area where the nuclear industry is present and to improve the organization and follow-up of medical care.

[Haematological malignancies: incidence in Basse-Normandie, France, for 1997-2004]. / Epidémiologie des hémopathies malignes en Basse-Normandie.

BACKGROUND: The study was designed to present the incidence of all the haematological malignancies in Basse-Normandie over the period 1997-2004. We extracted the data from the "Registre régional des hémopathies malignes de Basse-Normandie (RRHMBN)", a French registry which belongs to the Association of the French Cancer Registries (FRANCIM). All the malignant haematological diseases were coded using the third edition of the International Classification for Oncologic Diseases (ICD-O-3) and the ADICAP classification, a special version adapted in 2001 for haematology. Five thousand five hundred and ten new cases of malignant haematological disorders were registered over the period 1997-2004. Whatever the department constituting the Basse-Normandie (Calvados, Manche and Orne), no significant difference of incidence was detected. In men, the more frequent malignant disorders were non-Hodgkin's malignant lymphomas (NHML) followed by chronic lymphocytic leukemia and other mature neoplasms, myelodysplastic syndromes (MDS), multiple myeloma (MM), myeloproliferative disorders (MPD), acute myeloid leukemias (AML), Hodgkin's lymphomas (HL), Waldenström's macroglobulinemia (WM) and acute lymphoblastic leukemia (ALL). In women, MM is the third more frequent haematological disorders after NHML and lymphocytic leukaemia and other mature neoplasms, MPD, MDS, AML, Hodgkin's lymphomas, WM and ALL. The other haematological disorders are very rare. We provide the incidence for the main haematological disorders and for the first time we also present the incidence of the different subtypes of the Hodgkin's and non-Hodgkin's malignant lymphomas, mature lymphoid neoplasms, MPD and also MDS. These results are useful for the organization and follow-up of medical care. The development of specialized haematology and active protocols can optimize the management of the older patients. A high quality of the collected data remains necessary for a continuous watching and research on patients with malignant haematological diseases.