Efficacy of an early intensification treatment integrating chemotherapy, autologous stem cell transplantation and radiotherapy for poor risk primary mediastinal large B cell lymphoma with sclerosis

R Cairoli, G Grillo, A Tedeschi, L Gargantini, P Marenco, E Tresoldi, L Barbarano, A M Nosari, E Morra
Bone Marrow Transplantation 2002, 29 (6): 473-7
The aim of our study was to evaluate the impact of an early intensification programme including chemotherapy (CHT), autologous stem cell transplantation (ASCT) and radiation therapy (RT) in patients with primary mediastinal large B cell lymphoma (MLCL) with sclerosis presenting with adverse prognostic factors. Between 1993 and 1999, 19 patients with MLCL were referred to our institution. Four patients were classified as low risk according to the age-adjusted International Prognostic Index (AA-IPI). Fifteen (79%) were categorised in the high-intermediate or high risk group and were considered eligible for ASCT. Induction therapy consisted of VACOP-B (etoposide, doxorubicin, cyclophosphamide, vincristine, prednisone and bleomycin) for 12 weeks. After induction therapy the four low risk patients achieved a complete remission (CR) and did not undergo ASCT. Of the 15 poor risk patients, five achieved CR, seven partial remission (PR), and three showed refractory disease (RD). All these patients received mobilising therapy consisting of high-dose cyclophosphamide. After peripheral stem cell (PSC) collection, to obtain a greater tumor mass reduction before transplantation, the seven patients in PR underwent further treatment with high-dose etoposide and those with RD received two cycles of DHAP (dexamethasone, cytarabine and cisplatin). At the time of ASCT, seven patients were in CR, six in PR and two had RD. After transplantation using BEAM as preparative regimen, all patients but one achieved a CR. Seven patients with minimal (<25%) residual mass at computed tomography scan received further mediastinal RT even if they had a negative Ga(67) scan. At a median follow-up of 35 months from transplantation the disease free survival is 93%. The outcome following this programme of early intensification in poor prognosis MLCL results in a high incidence of durable remissions even in patients with refractory disease.

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