{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,11]],"date-time":"2026-02-11T15:01:13Z","timestamp":1770822073066,"version":"3.50.1"},"reference-count":31,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2004,9,15]],"date-time":"2004-09-15T00:00:00Z","timestamp":1095206400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cancer"],"published-print":{"date-parts":[[2004,10,15]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>BACKGROUND<\/jats:title><jats:p>Central nervous system involvement is a well recognized complication of systemic non\u2010Hodgkin lymphoma. Most central nervous system recurrences occur within the first 2 years after the initial diagnosis and are considered to represent clonally related recurrence of systemic disease. The authors attempted to investigate the clonal relation between the late\u2010delayed central nervous system involvement and the original systemic tumor.<\/jats:p><\/jats:sec><jats:sec><jats:title>METHODS<\/jats:title><jats:p>The authors studied archival, formalin fixed, paraffin embedded tissue samples from 8 patients with isolated cerebral involvement diagnosed &gt; 3 years after their initial presentation with aggressive, systemic, B\u2010cell non\u2010Hodgkin lymphoma. The rearranged immunoglobulin heavy\u2010chain variable region genes (<jats:italic>VH<\/jats:italic>) from both sites were amplified by polymerase chain reaction and were sequenced when necessary.<\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS<\/jats:title><jats:p>In three of five patients who had interpretable results, a distinct, monoclonal, <jats:italic>VH<\/jats:italic> family\u2010specific band profile was obtained from the cerebral and systemic lymphoma. In the other two patients, a similar <jats:italic>VH<\/jats:italic> band pattern was observed and also was compared using direct sequencing, which demonstrated sequence differences between tumors from the two sites.<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSIONS<\/jats:title><jats:p>Clonal variance between the cerebral and systemic lymphoma in these patients suggested the possibility that some instances of late\u2010delayed recurrence in the central nervous system represent a second, new B\u2010cell lymphoma rather than a true recurrence of the original systemic tumor, a finding that may have significant clinical and biologic implications. Cancer 2004. \u00a9 2004 American Cancer Society.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cncr.20575","type":"journal-article","created":{"date-parts":[[2004,9,15]],"date-time":"2004-09-15T18:00:34Z","timestamp":1095271234000},"page":"1843-1849","source":"Crossref","is-referenced-by-count":12,"title":["Late\u2010delayed cerebral involvement in systemic non\u2010Hodgkin 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