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Prospective evaluation of the conversion rate in the receptor status between primary breast cancer and metastasis: results from the GEICAM 2009-03 ConvertHER study.

Abstract：

:The objective of this study was to determine the conversion rate of human epidermal growth factor receptor 2 (HER2), estrogen receptor (ER) and progesterone receptor (PR) between primary tumors and metastatic lesions in advanced breast cancer. Patients with suspected diagnosis of locally recurrent or metastatic breast cancer, either at first relapse or after successive disease progressions, who had an appropriately preserved sample from a primary tumor and were scheduled for a biopsy of the recurrent lesion, were included. Blinded determinations of receptor status on paired samples were performed by immunohistochemistry and fluorescence in situ hybridization at a central laboratory and compared with those performed locally. Overall, 196 patients were included and 184 patients were considered evaluable. Reasons for non-evaluability included the inability to perform biopsy (n = 4) or biopsy results showing normal tissue (n = 3), benign disease (n = 3) or a second neoplasia (n = 2). Conversion rates determined at local level were higher than those determined centrally (HER2: 16 vs. 3 %, ER: 21 vs. 13 %, PR: 35 vs. 28 %, respectively). There was substantial agreement regarding the expression of HER2 in primary tumors and metastases, and ER at metastases, between local and central laboratories. PR at any site and ER at primary site showed moderate agreement. Oncologists altered their treatment plans in 31 % of patients whose tumor subtype had changed. These results reinforce the recommendation for performing confirmatory biopsies of metastases, not only to avoid misdiagnosis of breast cancer relapse, but also to optimize treatment (clinicaltrials.gov identifier: NCT01377363).

journal_name

Breast Cancer Res Treat

journal_title

Breast cancer research and treatment

authors

de Dueñas EM,Hernández AL,Zotano AG,Carrión RM,López-Muñiz JI,Novoa SA,Rodríguez AL,Fidalgo JA,Lozano JF,Gasión OB,Carrascal EC,Capilla AH,López-Barajas IB,Mateu MM,de Ceballos Reyna MH,Ferrando AO,Jañez NM,Ballerini VC

doi

10.1007/s10549-013-2825-2

subject

Has Abstract

pub_date

2014-02-01 00:00:00

pages

507-15

issue

eissn

0167-6806

issn

1573-7217

journal_volume

143

pub_type

临床试验,杂志文章,多中心研究

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Prospective evaluation of the conversion rate in the receptor status between primary breast cancer and metastasis: results from the GEICAM 2009-03 ConvertHER study.