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Clonality of lobular carcinoma in situ and synchronous invasive lobular carcinoma
Article first published online: 6 MAY 2004
Copyright © 2004 American Cancer Society
Volume 100, Issue 12, pages 2562–2572, 15 June 2004
How to Cite
Shelley Hwang, E., Nyante, S. J., Yi Chen, Y., Moore, D., DeVries, S., Korkola, J. E., Esserman, L. J. and Waldman, F. M. (2004), Clonality of lobular carcinoma in situ and synchronous invasive lobular carcinoma. Cancer, 100: 2562–2572. doi: 10.1002/cncr.20273
- Issue published online: 2 JUN 2004
- Article first published online: 6 MAY 2004
- Manuscript Accepted: 9 MAR 2004
- Manuscript Revised: 2 MAR 2004
- Manuscript Received: 8 JAN 2004
- National Institutes of Health. Grant Numbers: CA44768, CA58207
- University of California–San Francisco Clinical Investigator Research Program Award
- lobular carcinoma in situ;
- ductal carcinoma in situ;
- comparative genomic hybridization;
- breast neoplasms
Lobular carcinoma in situ (LCIS) of the breast is considered a marker for an increased risk of carcinoma in both breasts. However, the frequent association of LCIS with invasive lobular carcinoma (ILC) suggests a precursor-product relation. The possible genomic relation between synchronous LCIS and ILC was analyzed using the technique of array-based comparative genomic hybridization (CGH).
Twenty-four samples from the University of California–San Francisco pathology archives that contained synchronous LCIS and ILC were identified. Array CGH was performed using random primer–amplified microdissected DNA. Samples were hybridized onto bacterial artificial chromosome arrays composed of approximately 2400 clones. Patterns of alterations within synchronous LCIS and ILC were compared.
A substantial proportion of the genome was altered in samples of both LCIS and ILC. The most frequent alterations were gain of 1q and loss of 16q, both of which usually occurred as whole-arm changes. Smaller regions of gain and loss were seen on other chromosome arms. Fourteen samples of LCIS were related more to their paired samples of ILC than to any other ILC, as demonstrated by a weighted similarity score.
LCIS and ILC are neoplastic lesions that demonstrate a range of genomic alterations. In the current study, the genetic relation between synchronous LCIS and ILC suggested clonality in a majority of the paired specimens. These data were consistent with a progression pathway from LCIS to ILC. The authors conclude that LCIS, which is known to be a marker for an environment that is permissive of neoplasia, may itself represent a precursor to invasive carcinoma. Cancer 2004. © 2004 American Cancer Society.