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Supplementary Figure from African Ancestry–Associated Gene Expression Profiles in Triple-Negative Breast Cancer Underlie Altered Tumor Biology and Clinical Outcome in Women of African Descent

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posted on 2023-04-04, 00:22 authored by Rachel Martini, Princesca Delpe, Timothy R. Chu, Kanika Arora, Brittany Lord, Akanksha Verma, Deepa Bedi, Balasubramanyam Karanam, Isra Elhussin, Yalei Chen, Endale Gebregzabher, Joseph K. Oppong, Ernest K. Adjei, Aisha Jibril Suleiman, Baffour Awuah, Mahteme Bekele Muleta, Engida Abebe, Ishmael Kyei, Frances S. Aitpillah, Michael O. Adinku, Kwasi Ankomah, Ernest Baawuah Osei-Bonsu, Dhananjay A. Chitale, Jessica M. Bensenhaver, David S. Nathanson, LaToya Jackson, Lindsay F. Petersen, Erica Proctor, Brian Stonaker, Kofi K. Gyan, Lee D. Gibbs, Zarko Monojlovic, Rick A. Kittles, Jason White, Clayton C. Yates, Upender Manne, Kevin Gardner, Nigel Mongan, Esther Cheng, Paula Ginter, Syed Hoda, Olivier Elemento, Nicolas Robine, Andrea Sboner, John D. Carpten, Lisa Newman, Melissa B. Davis
Supplementary Figure from African Ancestry–Associated Gene Expression Profiles in Triple-Negative Breast Cancer Underlie Altered Tumor Biology and Clinical Outcome in Women of African Descent

Funding

Susan G. Komen (SGK)

National Cancer Institute (NCI)

United States Department of Health and Human Services

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National Institute on Minority Health and Health Disparities (NIMHD)

United States Department of Health and Human Services

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U.S. Department of Defense (DOD)

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ARTICLE ABSTRACT

Women of sub-Saharan African descent have disproportionately higher incidence of triple-negative breast cancer (TNBC) and TNBC-specific mortality across all populations. Population studies show racial differences in TNBC biology, including higher prevalence of basal-like and quadruple-negative subtypes in African Americans (AA). However, previous investigations relied on self-reported race (SRR) of primarily U.S. populations. Due to heterogeneous genetic admixture and biological consequences of social determinants, the true association of African ancestry with TNBC biology is unclear. To address this, we conducted RNA sequencing on an international cohort of AAs, as well as West and East Africans with TNBC. Using comprehensive genetic ancestry estimation in this African-enriched cohort, we found expression of 613 genes associated with African ancestry and 2,000+ associated with regional African ancestry. A subset of African-associated genes also showed differences in normal breast tissue. Pathway enrichment and deconvolution of tumor cellular composition revealed that tumor-associated immunologic profiles are distinct in patients of African descent. Our comprehensive ancestry quantification process revealed that ancestry-associated gene expression profiles in TNBC include population-level distinctions in immunologic landscapes. These differences may explain some differences in race–group clinical outcomes. This study shows the first definitive link between African ancestry and the TNBC immunologic landscape, from an African-enriched international multiethnic cohort.See related commentary by Hamilton et al., p. 2496.This article is highlighted in the In This Issue feature, p. 2483

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    Cancer Discovery

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    cancer

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