Frequency of the basal-like phenotype in African breast cancer

Department of Pathology, Faculty of Medicine, Makerere University, Kampala, Uganda.
Apmis (Impact Factor: 1.92). 12/2007; 115(12):1391-9. DOI: 10.1111/j.1600-0463.2007.00862.x
Source: PubMed

ABSTRACT Basal-like breast carcinoma has been recognized as a subtype with specific prognostic implications. However, there is a lack of reports about this category of breast tumors in African women. The aim of this study was to explore the basal-like phenotype in breast cancer patients in an African population, and a registry-based series was included from the well-defined Kyadondo County in Uganda (1.7 millions). We studied a total of 65 archival paraffin blocks of invasive breast cancer using antibodies against cytokeratin 5/6 and P-cadherin, and these markers were expressed in 34% of all cases and in 52% of ER (estrogen receptor)-negative tumors. All basal-like tumors were ER negative (p<0.0005) and PR (progesterone receptor) negative (p=0.002). Basal-like breast carcinomas were of a higher histologic grade (p=0.001), had high mitotic counts (p=0.002), and marked nuclear pleomorphism (p=0.002). P-cadherin-positive tumors had a high Ki-67 proliferative rate (p=0.039). In conclusion, the basal-like phenotype is frequent in this African series of breast cancer and is strongly associated with poor prognostic factors. Our findings might be significant in relation to clinical management of these patients, including novel targeted therapy.

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Available from: Hawa Nalwoga, May 29, 2014
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    • "Hence, apart from methodological discrepancies, biological differences might be present when comparing breast cancers from African and Caucasian populations (Elledge et al, 1994; Ikpatt et al, 2002; Jones et al, 2004; Porter et al, 2004). In line with this, a poorer outcome has been observed in African and African-American patients (Wojcik et al, 1998; Ikpatt et al, 2002) when compared with breast cancers among Caucasians, with differences in the spectrum of tumour characteristics and prognostic features such as the presence of tumour necrosis, low ER positivity rate, high HER2-positive rate, and a high frequency of basal-like features (Mbonde et al, 2001; Ikpatt et al, 2002; Carey et al, 2006; Nalwoga et al, 2006, 2007; Morris et al, 2007; Bird et al, 2008). "
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