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Oncology. 2012;83(4):218-27. doi: 10.1159/000341359. Epub 2012 Aug 16.

ABCB1, FCGR2A, and FCGR3A polymorphisms in patients with HER2-positive metastatic breast cancer who were treated with first-line taxane plus trastuzumab chemotherapy.

Author information

1
Department of Internal Medicine, Seoul National University College of Medicine, Korea.

Abstract

OBJECTIVE:

The aim of this study was to elucidate clinical implications of ABCB1, FCGR2A, and FCGR3A polymorphisms in patients with HER2-positive metastatic breast cancer (MBC) after taxane plus trastuzumab (TH) chemotherapy.

METHODS:

Using genomic DNA samples extracted from mononuclear cells of consecutive patients with HER2-positive MBC who received first-line TH, we analyzed five polymorphisms (ABCB1 1236C>T, ABCB1 2677G>T/A, ABCB1 3435C>T, FCGR2A 131H/R, and FCGR3A 158V/F) and then correlated them with the response rate, progression-free survival (PFS), overall survival (OS), and adverse events of patients.

RESULTS:

A total of 57 women were analyzed. The median age was 46 years (range 27-72). ABCB1 2677T carriers had a longer PFS (p = 0.037) along with a tendency toward a longer OS (p = 0.057). ABCB1 3435CC genotype carriers had a shorter PFS (p = 0.039) along with a tendency toward a shorter OS (p = 0.093). In combined analysis, PFS was significantly longer in ABCB1 1236CC and/or 2677TT carriers compared to the others (p = 0.006). FCGR2A 131H/R and FCGR3A 158V/F polymorphisms were not significantly associated with response rate, PFS, and OS.

CONCLUSIONS:

Our data support that ABCB1 polymorphisms may predict PFS after first-line TH chemotherapy in patients with HER2-positive MBC. In contrast, FCGR2A 131H/R and FCGR3A 158V/F polymorphisms could not predict treatment outcomes.

PMID:
22906996
DOI:
10.1159/000341359
[Indexed for MEDLINE]

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