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Annals of Surgical Oncology
Published in: Annals of Surgical Oncology 12/2016

01-11-2016 | Breast Oncology

Comparative Analysis of Breast Cancer Phenotypes in African American, White American, and West Versus East African patients: Correlation Between African Ancestry and Triple-Negative Breast Cancer

Authors: Evelyn Jiagge, MD, Aisha Souleiman Jibril, MD, Dhananjay Chitale, MD, Jessica M. Bensenhaver, MD, Baffour Awuah, MD, Mark Hoenerhoff, DVM, Ernest Adjei, MBChB, Mahteme Bekele, MD, Engida Abebe, MD, S. David Nathanson, MD, Kofi Gyan, DVM, Barbara Salem, MS, Joseph Oppong, MBChB, Francis Aitpillah, MBChB, Ishmael Kyei, MBChB, Ernest Osei Bonsu, MBChB, Erica Proctor, MD, Sofia D. Merajver, MD, Max Wicha, MD, Azadeh Stark, PhD, Lisa A. Newman, MD

Published in: Annals of Surgical Oncology | Issue 12/2016

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Abstract

Introduction

Triple-negative breast cancer (TNBC) is more common among African American (AA) and western sub-Saharan African breast cancer (BC) patients compared with White/Caucasian Americans (WA) and Europeans. Little is known about TNBC in east Africa.

Methods

Invasive BC diagnosed 1998–2014 were evaluated: WA and AA patients from the Henry Ford Health System in Detroit, Michigan; Ghanaian/west Africans from the Komfo Anokye Teaching Hospital in Kumasi, Ghana; and Ethiopian/east Africans from the St. Paul’s Hospital Millennium Medical College in Addis Ababa, Ethiopia. Histopathology and immunohistochemistry for estrogen receptor (ER), progesterone receptor (PR), and HER2/neu expression was performed in Michigan on formalin-fixed, paraffin-embedded samples from all cases.

Results

A total of 234 Ghanaian (mean age 49 years), 94 Ethiopian (mean age 43 years), 272 AA (mean age 60 years), and 321 WA (mean age 62 years; p = 0.001) patients were compared. ER-negative and TNBC were more common among Ghanaian and AA compared with WA and Ethiopian cases (frequency ER-negativity 71.1 and 37.1 % vs. 19.8 and 28.6 % respectively, p < 0.0001; frequency TNBC 53.2 and 29.8 % vs. 15.5 and 15.0 %, respectively, p < 0.0001). Among patients younger than 50 years, prevalence of TNBC remained highest among Ghanaians (50.8 %) and AA (34.3 %) compared with WA and Ethiopians (approximately 16 % in each; p = 0.0002).

Conclusions

This study confirms an association between TNBC and West African ancestry; TNBC frequency among AA patients is intermediate between WA and Ghanaian/West Africans consistent with genetic admixture following the west Africa-based trans-Atlantic slave trade. TNBC frequency was low among Ethiopians/East Africans; this may reflect less shared ancestry between AA and Ethiopians.
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Metadata
Title
Comparative Analysis of Breast Cancer Phenotypes in African American, White American, and West Versus East African patients: Correlation Between African Ancestry and Triple-Negative Breast Cancer
Authors
Evelyn Jiagge, MD
Aisha Souleiman Jibril, MD
Dhananjay Chitale, MD
Jessica M. Bensenhaver, MD
Baffour Awuah, MD
Mark Hoenerhoff, DVM
Ernest Adjei, MBChB
Mahteme Bekele, MD
Engida Abebe, MD
S. David Nathanson, MD
Kofi Gyan, DVM
Barbara Salem, MS
Joseph Oppong, MBChB
Francis Aitpillah, MBChB
Ishmael Kyei, MBChB
Ernest Osei Bonsu, MBChB
Erica Proctor, MD
Sofia D. Merajver, MD
Max Wicha, MD
Azadeh Stark, PhD
Lisa A. Newman, MD
Publication date
01-11-2016
Publisher
Springer International Publishing
Published in
Annals of Surgical Oncology / Issue 12/2016
Print ISSN: 1068-9265
Electronic ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-016-5420-z

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