Opinion statement
Management goals for patients with primary central nervous system lymphoma (PCNSL) include long-term disease control, management of neurologic complications, and preservation of neurocognitive function. Various treatment options can achieve several of these goals. Chemotherapy as monotherapy or as combination therapy has emerged as the cornerstone of therapy for patients with newly diagnosed PCNSL. Outside of a clinical trial, patients with newly diagnosed PCNSL should receive high-dose intravenous methotrexate (MTX) as a single agent or as part of a combination regimen with radiation therapy reserved for relapse. The regimen should have an adequate MTX dose (>3 g/m2) to reach cytotoxic concentrations in the cerebrospinal fluid (CSF) to treat occult leptomeningeal disease (LMD). Alternative modes of chemotherapy delivery for selected patients, preferably in the context of a clinical trial, include high-dose chemotherapy with autologous stem cell rescue and intra-arterial chemotherapy with blood–brain barrier disruption. Whole brain radiation therapy (WBRT) in standard doses and fractionation carries an unacceptable rate of long-term neurocognitive toxicity. However, lower doses in daily divided fractions may offer the possibility of adding this modality with preservation of cognition but should be performed only in the context of a clinical trial. The long-term efficacy and toxicity of this approach is currently under investigation. Certain presentations of PCNSL require different strategies. Patients with ocular lymphoma at diagnosis should receive high-dose MTX as this drug can reach cytotoxic intravitreal concentrations. Recurrence in the eyes is managed with intravitreal chemotherapy including MTX or rituximab or with radiation therapy. The field of treatment (eyes vs whole brain) should be individualized. Intrathecal (IT) MTX should be included in the treatment regimen for those patients with a positive CSF cytology, or in regimens in which lower doses of MTX are delivered over longer periods of time. It is probably reasonable to withhold IT chemotherapy in those patients who have no detectable subarachnoid disease and who can receive higher doses of MTX (>3 g/m2) over shorter infusion periods (2–4 h). Patients who develop leptomeningeal involvement despite high- dose MTX can be managed with IT chemotherapy such as liposomal cytarabine or MTX or even rituximab. Areas of bulky or symptomatic LMD should probably be treated with radiation therapy as well. Because PCNSL is an uncommon disease, entry into clinical trials must be pursued to advance the state of the art.
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David Peereboom has received research support and honoraria from Schering Plough.
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Ahluwalia, M.S., Peereboom, D.M. Primary Central Nervous System Lymphoma. Curr Treat Options Neurol 12, 347–359 (2010). https://doi.org/10.1007/s11940-010-0076-7
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DOI: https://doi.org/10.1007/s11940-010-0076-7