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Ambady P, Fu R, Netto JP, Kersch C, Firkins J, Doolittle ND, Neuwelt EA. Patterns of relapse in primary central nervous system lymphoma: inferences regarding the role of the neuro-vascular unit and monoclonal antibodies in treating occult CNS disease. Fluids Barriers CNS 2017; 14:16. [PMID: 28577579 PMCID: PMC5457655 DOI: 10.1186/s12987-017-0064-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 05/22/2017] [Indexed: 12/22/2022] Open
Abstract
Background and purpose The radiologic features and patterns of primary central nervous system lymphoma (PCNSL) at initial presentation are well described. High response rates can be achieved with first-line high-dose methotrexate (HD-MTX) based regimens, yet many relapse within 2 years of diagnosis. We describe the pattern of relapse and review the potential mechanisms involved in relapse. Methods We identified 78 consecutive patients who attained complete radiographic response (CR) during or after first-line treatment for newly diagnosed PCNSL (CD20+, diffuse large B cell type). Patients were treated with HD-MTX based regimen in conjunction with blood–brain barrier disruption (HD-MTX/BBBD); 44 subsequently relapsed. Images and medical records of these 44 consecutive patients were retrospectively reviewed. The anatomical location of enhancing lesions at initial diagnosis and at the time of relapse were identified and compared. Results 37/44 patients fulfilled inclusion criteria and had new measureable enhancing lesions at relapse; the pattern and location of relapse of these 37 patients were identified. At relapse, the new enhancement was at a spatially distinct site in 30 of 37 patients. Local relapse was found only in seven patients. Discussion Unlike gliomas, the majority of PCNSL had radiographic relapse at spatially distinct anatomical locations within the brain behind a previously intact neurovascular unit (NVU), and in few cases outside, the central nervous system (CNS). This may suggest either (1) reactivation of occult reservoirs behind an intact NVU in the CNS (or ocular) or (2) seeding from bone marrow or other extra CNS sites. Conclusion Recognizing patterns of relapse is key for early detection and may provide insight into potential mechanisms of relapse as well as help develop strategies to extend duration of complete response.
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Affiliation(s)
- Prakash Ambady
- Department of Neurology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, L603, Portland, OR, 97239, USA.,Portland Veterans Affairs Medical Center, Portland, OR, USA
| | - Rongwei Fu
- School of Public Health, Oregon Health & Science University, Portland, OR, USA.,Department of Emergency Medicine, Oregon Health & Science University, Portland, OR, USA
| | - Joao Prola Netto
- Department of Neurology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, L603, Portland, OR, 97239, USA.,Department of Radiology, Oregon Health & Science University, Portland, OR, USA
| | - Cymon Kersch
- Department of Neurology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, L603, Portland, OR, 97239, USA
| | - Jenny Firkins
- Department of Neurology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, L603, Portland, OR, 97239, USA
| | - Nancy D Doolittle
- Department of Neurology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, L603, Portland, OR, 97239, USA
| | - Edward A Neuwelt
- Department of Neurology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, L603, Portland, OR, 97239, USA. .,Portland Veterans Affairs Medical Center, Portland, OR, USA. .,Department of Neurosurgery, Oregon Health & Science University, Portland, OR, USA.
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