Long-term survival of women with basal-like ductal carcinoma in situ of the breast : a population-based cohort study

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Zhou , W , Jirstrom , K , Johansson , C , Amini , R-M , Blomqvist , C , Agbaje , O & Warnberg , F 2010 , ' Long-term survival of women with basal-like ductal carcinoma in situ of the breast : a population-based cohort study ' BMC Cancer , vol. 10 , 653 . DOI: 10.1186/1471-2407-10-653

Title: Long-term survival of women with basal-like ductal carcinoma in situ of the breast : a population-based cohort study
Author: Zhou, Wenjing; Jirstrom, Karin; Johansson, Christine; Amini, Rose-Marie; Blomqvist, Carl; Agbaje, Olorunsola; Warnberg, Fredrik
Contributor: University of Helsinki, Department of Oncology
Date: 2010-11-30
Language: eng
Number of pages: 8
Belongs to series: BMC Cancer
ISSN: 1471-2407
URI: http://hdl.handle.net/10138/164051
Abstract: Background: Microarray gene-profiling of invasive breast cancer has identified different subtypes including luminal A, luminal B, HER2-overexpressing and basal-like groups. Basal-like invasive breast cancer is associated with a worse prognosis. However, the prognosis of basal-like ductal carcinoma in situ (DCIS) is still unknown. Our aim was to study the prognosis of basal-like DCIS in a large population-based cohort. Methods: All 458 women with a primary DCIS diagnosed between 1986 and 2004, in Uppland and Vastmanland, Sweden were included. TMA blocks were constructed. To classify the DCIS tumors, we used immunohistochemical (IHC) markers (estrogen-, progesterone-, HER2, cytokeratin 5/6 and epidermal growth factor receptor) as a surrogate for the gene expression profiling. The association with prognosis was examined for basal-like DCIS and other subtypes using Kaplan-Meier survival analyses and Cox proportional hazards regression models. Results: IHC data were complete for 392 women. Thirty-two were basal-like (8.2%), 351 were luminal or HER2-positive (89.5%) and 9 unclassified (2.3%). Seventy-six women had a local recurrence of which 34 were invasive. Another 3 women had general metastases as first event. Basal-like DCIS showed a higher risk of local recurrence and invasive recurrence 1.8 (Confidence interval (CI) 95%, 0.8-4.2) and 1.9 (0.7-5.1), respectively. However, the difference was not statistically significant. Also, no statistically significant increased risk was seen for triple-negative or high grade DCIS. Conclusions: Basal-like DCIS showed about a doubled, however not statistically significant risk for local recurrence and developing invasive cancer compared with the other molecular subtypes. Molecular subtyping was a better prognostic parameter than histopathological grade.
Subject: GENE-EXPRESSION PATTERNS
CANCER SUBTYPES
CLASSIFICATION
MICROARRAY
AMPLIFICATION
HYBRIDIZATION
PROGNOSIS
SISH
RACE
3122 Cancers
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