Study of Pemetrexed to Treat Recurrent or Progressive Primary Central Nervous System Lymphoma

• Evaluate the longitudinal effect of intravenous pemetrexed on traditional quality of life and performance status measurements. [ Time Frame: 2.5 Years ] [ Designated as safety issue: No ]
• Evaluate the longitudinal tolerability of intravenous pemetrexed using standardized toxicity criteria. [ Time Frame: 2.5 Years ] [ Designated as safety issue: Yes ]

• Evaluate the longitudinal effect of intravenous pemetrexed (Alimta) on traditional quality of life and performance status measurements. [ Time Frame: 2 Years ] [ Designated as safety issue: No ]
• Evaluate the longitudinal tolerability of intravenous pemetrexed (Alimta) using standardized toxicity criteria. [ Time Frame: 2 Years ] [ Designated as safety issue: Yes ]

The purpose of this study is to determine if pemetrexed is effective in the treatment of primary central nervous system lymphoma (PCNSL) that has either worsened during treatment or has returned after completing treatment.

Despite the aggressive upfront use of methotrexate-based chemotherapy, primary central nervous system lymphoma (PCNSL) almost uniformly results in recurrence or progression and death. Palliative chemotherapy offers an improvement in time-to-progression, symptom control, quality of life, and potentially, survival. However, no established chemotherapy regimen for recurrence exists and new treatments are needed. Pemetrexed is a rationale strategy for therapeutic palliation of recurrent or progressive PCNSL, given its mechanism of action, convenient administration, single agent efficacy, its well established management algorithms, and its evidence of safety and efficacy in systemic malignancies.

Inclusion Criteria:

• Histological confirmation of Primary Central Nervous System Lymphoma
• Male or female > 18 years of age or older
• Negative pregnancy test (if of childbearing potential)
• Any number of previous recurrences will be allowed
• Karnofsky Performance Status > 60
• Hematocrit > 30,000
• Platelet > 100,000
• Absolute Neutrophil Count > 1,500
• Bilirubin < 1.5 x upper limits of normal
• Transaminases (ALT and AST) < 1.5 x upper limits of normal
• Creatinine < 1.5 x upper limits of normal
• Creatinine Clearance > 45 mL/min
• Adequate medical health to participate in this study
• Adequate documentation of menopause (natural/surgical) or patient commitment to routine use of reliable birth control (barrier/hormonal)
• Ability to read and understand the patient informed consent form
• Ability and willingness to follow all requirements of the study including following all directions, taking medication as prescribed, and completion of all diaries and forms

Exclusion Criteria:

• Karnofsky Performance Status < 60
• Hematocrit < 30,000
• Platelet < 100,000
• Absolute Neutrophil Count < 1,500
• Bilirubin >1.5 x upper limits of normal
• Transaminases (ALT & AST) > 1.5 x upper limits of normal
• Creatinine > 1.5 x upper limits of normal
• Creatinine Clearance < 45 mL/min
• Inability to undergo gadolinium-contrasted MRIs, including severe claustrophobia or insufficient allergy prophylaxis