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 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 p34(cdc2) 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.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Leoncini L,Lazzi S,Scano D,Mura A,Onida A,Massarelli G,Tosi P,Barbini P,Cevenini G,Massai MR,Pileri S,Falini B,Giordano A,Kraft R,Laissue JA,Cottier Hdoi
10.1002/(sici)1097-0215(20000615)86:6<777::aid-ijckeywords:
subject
Has Abstractpub_date
2000-06-15 00:00:00pages
777-81issue
6eissn
0020-7136issn
1097-0215pii
10.1002/(SICI)1097-0215(20000615)86:6<777::AID-IJCjournal_volume
86pub_type
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