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  • Title: Validation of the NCCN-IPI for diffuse large B-cell lymphoma (DLBCL): the addition of β2 -microglobulin yields a more accurate GELTAMO-IPI.
    Author: Montalbán C, Díaz-López A, Dlouhy I, Rovira J, Lopez-Guillermo A, Alonso S, Martín A, Sancho JM, García O, Sánchez JM, Rodríguez M, Novelli S, Salar A, Gutiérrez A, Rodríguez-Salazar MJ, Bastos M, Domínguez JF, Fernández R, Gonzalez de Villambrosia S, Queizan JA, Córdoba R, de Oña R, López-Hernandez A, Freue JM, Garrote H, López L, Martin-Moreno AM, Rodriguez J, Abraira V, García JF, GELTAMO-IPI Project InvestigatorsDepartment of Translational Research, MD Anderson Cancer Centre, Madrid, Spain.Department of Pathology, MD Anderson Cancer Centre, Madrid, Spain..
    Journal: Br J Haematol; 2017 Mar; 176(6):918-928. PubMed ID: 28106247.
    Abstract:
    The study included 1848 diffuse large B-cell lymphoma (DLBCL)patients treated with chemotherapy/rituximab. The aims were to validate the National Comprehensive Cancer Network International Prognostic Index (NCCN-IPI) and explore the effect of adding high Beta-2 microglobulin (β2M), primary extranodal presentation and intense treatment to the NCCN-IPI variables in order to develop an improved index. Comparing survival curves, NCCN-IPI discriminated better than IPI, separating four risk groups with 5-year overall survival rates of 93%, 83%, 67% and 49%, but failing to identify a true high-risk population. For the second aim the series was split into training and validation cohorts: in the former the multivariate model identified age, lactate dehydrogenase, Eastern Cooperative Oncology Group performance status, Stage III-IV, and β2M as independently significant, whereas the NCCN-IPI-selected extranodal sites, primary extranodal presentation and intense treatments were not. These results were confirmed in the validation cohort. The Grupo Español de Linfomas/Trasplante de Médula ósea (GELTAMO)-IPI developed here, with 7 points, significantly separated four risk groups (0, 1-3, 4 or ≥5 points) with 11%, 58%, 17% and 14% of patients, and 5-year overall survival rates of 93%, 79%, 66% and 39%, respectively. In the comparison GELTAMO IPI discriminated better than the NCCN-IPI. In conclusion, GELTAMO-IPI is more accurate than the NCCN-IPI and has statistical and practical advantages in that the better discrimination identifies an authentic high-risk group and is not influenced by primary extranodal presentation or treatments of different intensity.
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