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Erschienen in:

01.06.2007 | Clinical trial

Predicting response to primary chemotherapy: gene expression profiling of paraffin-embedded core biopsy tissue

verfasst von: Lida Mina, Sharon E. Soule, Sunil Badve, Fredrick L. Baehner, Joffre Baker, Maureen Cronin, Drew Watson, Mei-Lan Liu, George W. Sledge Jr, Steve Shak, Kathy D. Miller

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 2/2007

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Abstract

Purpose

Primary chemotherapy provides an ideal opportunity to correlate gene expression with response to treatment. We used paraffin-embedded core biopsies from a completed phase II trial to identify genes that correlate with response to primary chemotherapy.

Patients and Methods

Patients with newly diagnosed stage II or III breast cancer were treated with sequential doxorubicin 75 mg/M2 q2 wks × 3 and docetaxel 40 mg/M2 weekly × 6; treatment order was randomly assigned. Pretreatment core biopsy samples were interrogated for genes that might correlate with pathologic complete response (pCR). In addition to the individual genes, the correlation of the Oncotype DX Recurrence Score with pCR was examined.

Results

Of 70 patients enrolled in the parent trial, core biopsies samples with sufficient RNA for gene analyses were available from 45 patients; 9 (20%) had inflammatory breast cancer (IBC). Six (14%) patients achieved a pCR. Twenty-two of the 274 candidate genes assessed correlated with pCR (p < 0.05). Genes correlating with pCR could be grouped into three large clusters: angiogenesis-related genes, proliferation related genes, and invasion-related genes. Expression of estrogen receptor (ER)-related genes and Recurrence Score did not correlate with pCR. In an exploratory analysis we compared gene expression in IBC to non-inflammatory breast cancer; twenty-four (9%) of the genes were differentially expressed (p < 0.05), 5 were upregulated and 19 were downregulated in IBC.

Conclusion

Gene expression analysis on core biopsy samples is feasible and identifies candidate genes that correlate with pCR to primary chemotherapy. Gene expression in IBC differs significantly from noninflammatory breast cancer.

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Titel: Predicting response to primary chemotherapy: gene expression profiling of paraffin-embedded core biopsy tissue
verfasst von: Lida Mina
Sharon E. Soule
Sunil Badve
Fredrick L. Baehner
Joffre Baker
Maureen Cronin
Drew Watson
Mei-Lan Liu
George W. Sledge Jr
Steve Shak
Kathy D. Miller
Publikationsdatum: 01.06.2007
Verlag: Kluwer Academic Publishers-Plenum Publishers
Erschienen in: Breast Cancer Research and Treatment / Ausgabe 2/2007
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI: https://doi.org/10.1007/s10549-006-9366-x

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Predicting response to primary chemotherapy: gene expression profiling of paraffin-embedded core biopsy tissue