High cell kinetics is associated with amplification of the int-2, bcl-1, myc and erbB-2 proto-oncogenes and loss of heterozygosity at the DF3 locus in primary breast cancers.

Abstract:

:Cell kinetics is a predictive parameter of breast-cancer aggressiveness, and mutations occurring in mammary tumorigenesis may favor uncontrolled cell proliferation. In this study, cell kinetics, clinico-pathological characteristics and genetic alterations at the int-2, bcl-1, c-myc, c-erbB-2, and DF3 loci were analyzed and correlated in 54 primary breast carcinomas. The occurrence of mutations at more than one locus was also studied. Tumor-proliferative activity was evaluated by determination of the thymidine labeling index (TLI). Amplification (AMP) of int-2 was observed in 11.2%, of bcl-1 in 9.4%, of c-myc in 5.7% and of c-erbB-2 in 8.6% of the carcinomas. Loss of heterozygosity (LOH) at the DF3 locus was detected in 13.9% of the tumors. Genetic alterations demonstrated a significant association with patient's age and high TLI values. AMP and LOH+AMP did not appear to be statistically related to histotype, histological grade, tumor size or lymph-node status. Alone, allele loss at the DF-3 locus was not significantly associated with any of the clinico-pathological characteristics studied. Alterations at more than one locus, including int-2/bcl-1, int-2/c-myc, int-2/bcl-1/c-erbB-2, and c-myc/DF3, were detected in 11.1% of the tumors. Multiple mutations were found only in less differentiated tumors, which included the 2 cases from the youngest patients of the series.

journal_name

Int J Cancer

authors

Contegiacomo A,Pizzi C,De Marchis L,Alimandi M,Delrio P,Di Palma E,Petrella G,Ottini L,French D,Frati L

doi

10.1002/ijc.2910610102

subject

Has Abstract,Author List Incomplete

pub_date

1995-03-29 00:00:00

pages

1-6

issue

1

eissn

0020-7136

issn

1097-0215

journal_volume

61

pub_type

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