Identification of copy number alterations associated with the progression of DCIS to invasive ductal carcinoma

C Johnson,Ig Campbell,K Opeskin,Se Boyle,P Hill,Er Thompson,Kl Gorringe,Y Wang,Gb Mann

doi:10.1186/1897-4287-10-s2-a93

Abstract

Ductal carcinoma in situ (DCIS) is a non-obligate precursor to invasive ductal carcinoma (IDC). Annotation of the genetic differences between the two lesions may assist in the identification of genes that promote the invasive phenotype. Synchronous DCIS and IDC cells were microdissected from FFPE tissue and analysed by molecular inversion probe (MIP) copy number arrays. Matched IDC and DCIS showed highly similar copy number profiles (average of 83% of the genome shared) indicating a common clonal origin although there is evidence that the DCIS continues to evolve in parallel with the co-existing IDC. Four chromosomal regions of loss (3q, 6q, 8p and 11q) and four regions of gain (5q, 16p, 19q and 20) were recurrently affected in IDC but not in DCIS. CCND1 and MYC showed increased amplitude of gain in IDC. One region of loss (17p11.2) was specific to DCIS. IDC-specific regions include genes with previous links to breast cancer progression and potential therapeutic targets such as AXL, SPHK1 and PLAUR.

Highlights

From Familial Aspects of Cancer 2011 Research and Practice: A combined meeting of kConFab, Australian Breast Cancer Family Study, Australian Colorectal Cancer Family Study, Australian Ovarian Cancer Study, Family Cancer Clinics of Australia and New Zealand and kConFab Kingscliff, Australia. 23-26 August 2011
Identification of copy number alterations associated with the progression of Ductal carcinoma in situ (DCIS) to invasive ductal carcinoma
Identification of the genetic differences between the two lesions may assist in identifying genes that promote the invasive phenotype

Summary

Introduction

From Familial Aspects of Cancer 2011 Research and Practice: A combined meeting of kConFab, Australian Breast Cancer Family Study, Australian Colorectal Cancer Family Study, Australian Ovarian Cancer Study, Family Cancer Clinics of Australia and New Zealand and kConFab Kingscliff, Australia. 23-26 August 2011. Identification of copy number alterations associated with the progression of DCIS to invasive ductal carcinoma C Johnson1,2†, KL Gorringe1,2*†, ER Thompson1, K Opeskin3, SE Boyle1, Y Wang4, P Hill3, GB Mann5†, IG Campbell1,2† From Familial Aspects of Cancer 2011 Research and Practice: A combined meeting of kConFab, Australian Breast Cancer Family Study, Australian Colorectal Cancer Family Study, Australian Ovarian Cancer Study, Family Cancer Clinics of Australia and New Zealand and kConFab Kingscliff, Australia.

Results

Conclusion