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In a study designed to elucidate the reason for this efficacy, two cell lines derived from lymphomas with BCL2 gene rearrangement (SU‐DHL‐4 and SU‐DHL‐6) showed remarkable growth inhibition and cell‐death, and two other cell lines derived from a diffuse lymphoma (RC‐K8) and a mantle cell lymphoma (SP‐49) showed moderate growth inhibition, but neither a CD20 weakly positive cell line (NALL‐1) nor a negative cell line (MOLT‐4) showed any growth inhibition. An examination of the intensity of cell‐surface CD20 expression showed no correlation between intensity and degree of growth inhibition among the four cell lines showing growth inhibition. Morphological examination revealed condensed and fragmented nuclei and budding of the plasma membrane, both characteristic of apoptosis, with some cells in these cell lines showing growth inhibition by C2B8. Such apoptosis was also confirmed by flow cytometric analysis, suggesting that, at least in part, apoptosis plays a role in this growth inhibition. This growth‐inhibitory mechanism may thus account for the effectiveness of C2B8 antibody therapy.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1581417124662472450","@type":"Researcher","foaf:name":[{"@value":"Hirohumi Taji"}]},{"@id":"https://cir.nii.ac.jp/crid/1410001204700340739","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000000451698"}],"foaf:name":[{"@value":"Yoshitoyo Kagami"}]},{"@id":"https://cir.nii.ac.jp/crid/1581417124662472455","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000000699395"}],"foaf:name":[{"@value":"Yasutaka Okada"}]},{"@id":"https://cir.nii.ac.jp/crid/1581417124662472449","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000000699397"}],"foaf:name":[{"@value":"Manabu Andou"}]},{"@id":"https://cir.nii.ac.jp/crid/1581417124662472453","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000000699400"}],"foaf:name":[{"@value":"Yoshimi 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