Volume 86, Issue 6 pp. 777-781
CARCINOGENESIS

Expression of the ALK protein by anaplastic large-cell lymphomas correlates with high proliferative activity

Lorenzo Leoncini

Lorenzo Leoncini

Institute of Pathology, University of Sassari, Sassari, Italy

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Stefano Lazzi

Stefano Lazzi

Institute of Pathologic Anatomy and Histology, University of Siena, Siena, Italy

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Donatella Scano

Donatella Scano

Institute of Pathology, University of Sassari, Sassari, Italy

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Antonina Mura

Antonina Mura

Institute of Pathology, University of Sassari, Sassari, Italy

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Angela Onida

Angela Onida

Institute of Pathology, University of Sassari, Sassari, Italy

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Giovannino Massarelli

Giovannino Massarelli

Institute of Pathology, University of Sassari, Sassari, Italy

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Piero Tosi

Corresponding Author

Piero Tosi

Institute of Pathologic Anatomy and Histology, University of Siena, Siena, Italy

Institute of Pathologic Anatomy and Histology, University of Siena, Via delle Scotte 6, I-53100 Siena, Italy. Fax: +(39)0577 233 235Search for more papers by this author
Paolo Barbini

Paolo Barbini

Institute of Thoracic and Cardiovascular Surgery and Biomedical Technology, University of Siena, Siena, Italy

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Gabriele Cevenini

Gabriele Cevenini

Institute of Thoracic and Cardiovascular Surgery and Biomedical Technology, University of Siena, Siena, Italy

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Maria Rita Massai

Maria Rita Massai

Institute of Thoracic and Cardiovascular Surgery and Biomedical Technology, University of Siena, Siena, Italy

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Stefano Pileri

Stefano Pileri

Institute of Hematology “L. & A. Seràgnoli”, Hemolymphopathology Unit, University of Bologna, Bologna, Italy

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Brunangelo Falini

Brunangelo Falini

Institute of Hematology, University of Perugia, Perugia, Italy

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Antonio Giordano

Antonio Giordano

Thomas Jefferson Medical College, Philadelphia, Pennsylvania, USA

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Rainer Kraft

Rainer Kraft

Institute of Pathology, University of Berne, Berne, Switzerland

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Jean A. Laissue

Jean A. Laissue

Institute of Pathology, University of Berne, Berne, Switzerland

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Hans Cottier

Hans Cottier

Institute of Pathology, University of Berne, Berne, Switzerland

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Abstract

A variable fraction of anaplastic large-cell lymphomas (ALCLs) exhibits a t(2;5)(p23;q35) translocation that results in expression of the chimeric hyperphosphorylated protein NPM-ALK (p80). Tumor cells expressing NPM-ALK exhibit markedly enhanced proliferative activity, but comparative cellular kinetic studies on ALK+ (ALK lymphomas) and ALK lymphomas are lacking. The present study showed that ALK+ lymphomas, detected with the monoclonal antibody ALKc (n = 17), had significantly higher average values for the proliferation-associated parameters mitotic index, ana/telophase index, growth index (x × mitotic index – apoptotic index, assuming x = 3), percentages of Ki-67+ cells and fraction of cells expressing cyclin A or B or the cell cycle–regulatory protein p34cdc2 than did ALK ALCLs (n = 15). Whether this intense proliferative activity contributes to the good response to chemotherapy and favorable outcome of ALK+ ALCLs remains to be assessed in a larger series of patients. Our findings support the notion that ALK+ and ALK ALCLs are 2 distinct disease entities. Int. J. Cancer 86:777–781, 2000. © 2000 Wiley-Liss, Inc.

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