{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,18]],"date-time":"2026-03-18T22:38:22Z","timestamp":1773873502480,"version":"3.50.1"},"reference-count":35,"publisher":"Proceedings of the National Academy of Sciences","issue":"30","content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2013,7,23]]},"abstract":"<jats:p>Diffuse large B-cell lymphoma (DLBCL) represents a heterogeneous diagnostic category with distinct molecular subtypes that can be defined by gene expression profiling. However, even within these defined subtypes, heterogeneity prevails. To further elucidate the pathogenesis of these entities, we determined the expression of the tumor suppressor phosphatase and tensin homolog (PTEN) in 248 primary DLBCL patient samples. These analyses revealed that loss of PTEN was detectable in 55% of germinal center B-cell-like (GCB) DLBCLs, whereas this abnormality was found in only 14% of non-GCB DLBCL patient samples. In GCB DLBCL, the PTEN status was inversely correlated with activation of the oncogenic PI3K\/protein kinase B (AKT) pathway in both DLBCL cell lines and primary patient samples. Reexpression of PTEN induced cytotoxicity in PTEN-deficient GCB DLBCL cell line models by inhibiting PI3K\/AKT signaling, indicating an addiction to this pathway in this subset of GCB DLBCLs. PI3K\/AKT inhibition induced down-regulation of the transcription factor MYC. Reexpression of MYC rescued GCB DLBCL cells from PTEN-induced toxicity, identifying a regulatory mechanism of MYC expression in DLBCL. Finally, pharmacologic PI3K inhibition resulted in toxicity selectively in PTEN-deficient GCB DLBCL lines. Collectively, our results indicate that PTEN loss defines a PI3K\/AKT-dependent GCB DLBCL subtype that is addicted to PI3K and MYC signaling and suggest that pharmacologic inhibition of PI3K might represent a promising therapeutic approach in these lymphomas.<\/jats:p>","DOI":"10.1073\/pnas.1305656110","type":"journal-article","created":{"date-parts":[[2013,7,10]],"date-time":"2013-07-10T04:50:57Z","timestamp":1373431857000},"page":"12420-12425","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":240,"title":["PTEN loss defines a PI3K\/AKT pathway-dependent germinal center subtype of diffuse large B-cell lymphoma"],"prefix":"10.1073","volume":"110","author":[{"given":"Matthias","family":"Pfeifer","sequence":"first","affiliation":[{"name":"Department of Hematology, Oncology and Tumor Immunology, Charit\u00e9 Universit\u00e4tsmedizin, 13353 Berlin, Germany;"}]},{"given":"Michael","family":"Grau","sequence":"additional","affiliation":[{"name":"Department of Physics, Philipps University, 35032 Marburg, Germany;"}]},{"given":"Dido","family":"Lenze","sequence":"additional","affiliation":[{"name":"Institute of Pathology, Charit\u00e9 Universit\u00e4tsmedizin, 12203 Berlin, Germany; and"}]},{"given":"S\u00f6ren-Sebastian","family":"Wenzel","sequence":"additional","affiliation":[{"name":"Department of Hematology, Oncology and Tumor Immunology, Charit\u00e9 Universit\u00e4tsmedizin, 13353 Berlin, Germany;"}]},{"given":"Annette","family":"Wolf","sequence":"additional","affiliation":[{"name":"Department of Hematology, Oncology and Tumor Immunology, Charit\u00e9 Universit\u00e4tsmedizin, 13353 Berlin, Germany;"}]},{"given":"Brigitte","family":"Wollert-Wulf","sequence":"additional","affiliation":[{"name":"Department of Hematology, Oncology and Tumor Immunology, Charit\u00e9 Universit\u00e4tsmedizin, 13353 Berlin, Germany;"}]},{"given":"Kerstin","family":"Dietze","sequence":"additional","affiliation":[{"name":"Department of Hematology, Oncology and Tumor Immunology, Charit\u00e9 Universit\u00e4tsmedizin, 13353 Berlin, Germany;"}]},{"given":"Hendrik","family":"Nogai","sequence":"additional","affiliation":[{"name":"Department of Hematology, Oncology and Tumor Immunology, Charit\u00e9 Universit\u00e4tsmedizin, 13353 Berlin, Germany;"}]},{"given":"Benjamin","family":"Storek","sequence":"additional","affiliation":[{"name":"Department of Hematology, Oncology and Tumor Immunology, Charit\u00e9 Universit\u00e4tsmedizin, 13353 Berlin, Germany;"}]},{"given":"Hannelore","family":"Madle","sequence":"additional","affiliation":[{"name":"Department of Hematology, Oncology and Tumor Immunology, Charit\u00e9 Universit\u00e4tsmedizin, 13353 Berlin, Germany;"}]},{"given":"Bernd","family":"D\u00f6rken","sequence":"additional","affiliation":[{"name":"Department of Hematology, Oncology and Tumor Immunology, Charit\u00e9 Universit\u00e4tsmedizin, 13353 Berlin, Germany;"}]},{"given":"Martin","family":"Janz","sequence":"additional","affiliation":[{"name":"Department of Hematology, Oncology and Tumor Immunology, Charit\u00e9 Universit\u00e4tsmedizin, 13353 Berlin, Germany;"}]},{"given":"Stephan","family":"Dirnhofer","sequence":"additional","affiliation":[{"name":"Institute of Pathology, University Hospital, 4031 Basel, Switzerland"}]},{"given":"Peter","family":"Lenz","sequence":"additional","affiliation":[{"name":"Department of Physics, Philipps University, 35032 Marburg, Germany;"}]},{"given":"Michael","family":"Hummel","sequence":"additional","affiliation":[{"name":"Institute of Pathology, Charit\u00e9 Universit\u00e4tsmedizin, 12203 Berlin, Germany; and"}]},{"given":"Alexandar","family":"Tzankov","sequence":"additional","affiliation":[{"name":"Institute of Pathology, University Hospital, 4031 Basel, Switzerland"}]},{"given":"Georg","family":"Lenz","sequence":"additional","affiliation":[{"name":"Department of Hematology, Oncology and Tumor Immunology, Charit\u00e9 Universit\u00e4tsmedizin, 13353 Berlin, Germany;"}]}],"member":"341","published-online":{"date-parts":[[2013,7,9]]},"reference":[{"key":"e_1_3_4_1_2","doi-asserted-by":"crossref","first-page":"1803","DOI":"10.1200\/JCO.2010.33.3252","article-title":"Pathogenesis of non-Hodgkin\u2019s lymphoma","volume":"29","author":"Nogai H","year":"2011","unstructured":"H Nogai, B D\u00f6rken, G Lenz, Pathogenesis of non-Hodgkin\u2019s lymphoma. 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