Radiotherapy in combined treatment of patients with diffuse large B-cell lymphoma

CLINICAL PRESENTATION, DIAGNOSIS, AND MANAGEMENT OF LYMPHOID MALIGNANCIES , , ,

Yu.N. Vinogradova, N.V. Ilin, D.V. Larionov, M.M. Khodzhibekova, N.A. Kostenikov, and L.I. Korytova

Russian Research Centre for Radiology and Surgical Technologies, RF Ministry of Health, Saint Petersburg, Russian Federation

ABSTRACT

The study included 86 primary patients (age: 18–83) with diffuse large B-cell lymphoma, I to IV stages, who received (R)-CHOP regimen and radiotherapy at the CRIRR (at present RRCRST) over the period 2000–2012. The follow-up period median was 42 months (5–120 months). Positron emission tomography (PET) with 18F-FDG was performed in 45 patients at the various follow-up time-points. In all patients, the changes of hematologic indices were observed using baseline, pre-, and postradiation measurements. After combined treatment completed, remission was achieved in 80 out of 86 (93.0 %) patients, including complete or uncertain complete remission and partial remission in 86.0 % and 7.0 %, respectively. During the initial therapy, disease progression occurred in 6 (7.0 %) patients. After the chemotherapy stage, complete remission was noted in 56 (65.1 %) patients only. Additional radiotherapy promoted the increase in the rate of complete and uncertain complete response by 21.9 %. Disseminated disease relapses developed in 2 out of 80 (2.5 %) patients. The complete response rate in the patients who received radiotherapy using the various fractionation regimens was similar. 5-year overall, relapse-free, and progression–free survival were 89.7 ± 3.9 %, 96.6 ± 2.4 %, and 85.4 ± 4.8 %, respectively. In 20.6 % of the patients examined after chemotherapy, PET gave positive results, while after the radiotherapy stage, all the patients examined at this time-point were PET-negative. Radiotherapy was accompanied by mainly I–II grade hematologic toxicity, and in 16–58 % of patients, no interruption of treatment were required. Neutropenia and thrombocytopenia occurred more frequently at the twice-a-day irradiation.

Keywords: diffuse large B-cell lymphoma, radiotherapy, positron emission tomography, hematologic toxicity.

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