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Genomic and immunophenotypical characterization of pure micropapillary carcinomas of the breast
Author(s) -
Marchiò C,
Iravani M,
Natrajan R,
Lambros MB,
Savage K,
Tamber N,
Fenwick K,
Mackay A,
Senetta R,
Palma S Di,
Schmitt FC,
Bussolati G,
Ellis IO,
Ashworth A,
Sapino A,
ReisFilho JS
Publication year - 2008
Publication title -
the journal of pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.964
H-Index - 184
eISSN - 1096-9896
pISSN - 0022-3417
DOI - 10.1002/path.2368
Subject(s) - comparative genomic hybridization , tissue microarray , biology , cyclin d1 , immunohistochemistry , breast cancer , pathology , cancer research , microarray , microbiology and biotechnology , chromosome , cancer , medicine , gene , gene expression , genetics , cell cycle
Pure invasive micropapillary carcinoma (MPC) is a special histological type that accounts for 0.7–3% of all breast cancers. MPC has a distinctive growth pattern and a more aggressive clinical behaviour than invasive ductal carcinomas of no special type (IDC‐NSTs). To define the molecular characteristics of MPCs, we profiled a series of 12 MPCs and 24 grade and oestrogen receptor (ER)‐matched IDC‐NSTs using high‐resolution microarray comparative genomic hybridization (aCGH). In addition, we generated a tissue microarray containing a series of 24 MPCs and performed immunohistochemical analysis with ER, PR, Ki‐67, HER2, CK5/6, CK14, CK17, EGFR, topoisomerase‐IIα, cyclin D1, caveolin‐1, E‐cadherin, and β‐catenin antibodies. In situ hybridization probes were employed to evaluate the prevalence of amplification of HER2, TOP2A, EGFR, CCND1, MYC, ESR1 , and FGFR1 genes. aCGH analysis demonstrated that MPCs significantly differed from IDC‐NSTs at the genomic level. Gains of 1q, 2q, 4p, 6p, 6q23.2–q27, 7p, 7q, 8p, 8q, 9p, 10p, 11q, 12p, 12q, 16p, 17p, 17q, 19p, 20p, 20q, and 21q, and losses of 1p, 2p, 6q11.1–q16.3, 6q21–q22.1, 9p, 11p, 15q, and 19q were more prevalent in MPCs. High‐level gains/amplifications of 8p12–p11, 8q12, 8q13, 8q21, 8q23, 8q24, 17q21, 17q23, and 20q13 were significantly associated with MPCs. A comparison between 24 MPCs and a series of 48 grade and ER‐matched IDC‐NSTs revealed that high cyclin D1 expression, high proliferation rates, and MYC (8q24) amplification were significantly associated with MPCs. Our results demonstrate that MPCs have distinct histological features and molecular genetic profiles supporting the contention that they constitute a distinct pathological entity. Copyright © 2008 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.