Preliminary results of combined chemotherapy and radiotherapy for non-AIDS primary central nervous system lymphoma. Trans-Tasman Radiation Oncology Group (TROG).

Objectives: To assess the results and toxicity of a regimen of combined chemotherapy and radiotherapy for patients with non-AIDS-related primary central nervous system lymphoma.
Design: Prospective assessment of patients treated with intravenous methotrexate followed by cranial irradiation between 1 January 1991 and 31 July 1995.
Patients and Setting: Patients attending nine Australian and New Zealand centres who were eligible and gave informed consent.
Main Outcome Measures: Probability of survival at two years, and acute toxicity.
Results: Twenty-four patients were treated. Their probability of survival at two years was 70% (95% confidence interval [CI], 45%-95%). The acute toxicity of the regimen was minimal in most cases, but one patient died of treatment-related neutropenia and subsequent sepsis. Two patients showed progression of pre-existing short term memory disturbance, without evidence of recurrent lymphoma.
Conclusions: Combined-modality therapy improves survival in patients with non-AIDS-related primary central nervous system lymphoma, at least in the short term, relative to radiotherapy alone. The combined regimen resulted in only moderate treatment-related morbidity. Longer follow-up is required for a more accurate estimate of late effects and long-term survival prospects.