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Comparative genomic hybridization in patients with supratentorial and infratentorial primitive neuroectodermal tumors
Author(s) -
Russo Carolyn,
Pellarin Malgorzata,
Tingby Ola,
Bollen Andrew W.,
Lamborn Kathleen R.,
Mohapatra Gayatry,
Collins V. Peter,
Feuerstein Burt G.
Publication year - 1999
Publication title -
cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.052
H-Index - 304
eISSN - 1097-0142
pISSN - 0008-543X
DOI - 10.1002/(sici)1097-0142(19990715)86:2<331::aid-cncr18>3.0.co;2-#
Subject(s) - medicine , comparative genomic hybridization , pathology , biology , genetics , genome , gene
BACKGROUND Intracranial primitive neuroectodermal tumors (PNETs) occur in the supratentorial and infratentorial regions of the brain. Although histologically similar, the natural history of the tumor at each site differs. The study goal was to determine whether there was evidence of a genetic difference between supratentorial and infratentorial PNETs. METHODS Using comparative genomic hybridization (CGH), 53 PNETs were analyzed to determine copy number aberrations. Forty‐three tumors were located in the cerebellum (IPNETs), and ten were supratentorial PNETs (SPNETs). All samples were reviewed to confirm the diagnosis. Each specimen had at least 50% tumor. RESULTS Six of the 43 cases of IPNET had no copy number aberrations. In contrast, each case of SPNET had copy number aberrations detected by CGH. Statistically significant differences in copy number aberrations of chromosomes 14, 17, and 19 were detected in the two groups. The most common copy number aberration in the IPNETs was gain of chromosome 17q, which was observed in 16 of 43 cases (37%). However, no case of SPNET had gain of 17q. Loss of 14q was detected in four of ten SPNETs but was not detected in any of the IPNET cases. Loss of 19q was detected in 4 of 10 SPNETs and in only 1 of 43 IPNETs. CONCLUSIONS These results indicate that the genetic aberrations of IPNETs differ from the genetic aberrations of SPNETs. Although they are similar histologically, SPNETs and IPNETs appear to be biologically distinct entities. Cancer 1999;86:331–9. © 1999 American Cancer Society.