Profiling the Somatic Mutational Landscape of Breast Tumors from Hispanic/Latina Women Reveals Conserved and Unique Characteristics

Author:

Ding Yuan Chun1ORCID,Song Hanbing2ORCID,Adamson Aaron W.1ORCID,Schmolze Daniel3ORCID,Hu Donglei4ORCID,Huntsman Scott4ORCID,Steele Linda1ORCID,Patrick Carmina S.1ORCID,Tao Shu5ORCID,Hernandez Natalie6ORCID,Adams Charleen D.7ORCID,Fejerman Laura8ORCID,Gardner Kevin9ORCID,Nápoles Anna María10ORCID,Pérez-Stable Eliseo J.11ORCID,Weitzel Jeffrey N.12ORCID,Bengtsson Henrik1314ORCID,Huang Franklin W.21415161718ORCID,Neuhausen Susan L.1ORCID,Ziv Elad41416ORCID

Affiliation:

1. 1Department of Population Sciences, Beckman Research Institute of City of Hope, Duarte, California.

2. 2Division of Hematology/Oncology, Department of Medicine, University of California, San Francisco, San Francisco, California.

3. 3Department of Pathology, City of Hope Medical Center, Duarte, California.

4. 4Division of General Internal Medicine, Department of Medicine, University of California, San Francisco, San Francisco, California.

5. 5Integrative Genomics Shared Resource, Beckman Research Institute of City of Hope, Duarte, California.

6. 6Western University of Health Sciences College of Graduate Nursing, Pomona, California.

7. 7Harvard T.H. Chan School of Public Health, Boston, Massachusetts.

8. 8Department of Public Health Sciences and Comprehensive Cancer Center, University of California Davis, Davis, California.

9. 9Department of Pathology and Cell Biology, Columbia University Irvine Medical Center, New York, New York.

10. 10Division of Intramural Research, National Institute on Minority and Health Disparities, National Institutes of Health, Bethesda, Maryland.

11. 11National Institute on Minority and Health Disparities, NIH, Bethesda, Maryland.

12. 12Latin American School of Oncology, Sierra Madre, California.

13. 13Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California.

14. 14Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, California.

15. 15Bakar Computational Health Sciences Institute, University of California, San Francisco, San Francisco, California.

16. 16Institute for Human Genetics, University of California, San Francisco, San Francisco, California.

17. 17Chan Zuckerberg Biohub, San Francisco, California.

18. 18Department of Medicine, San Francisco Veterans Affairs Medical Center, San Francisco, California.

Abstract

Abstract Somatic mutational profiling is increasingly being used to identify potential targets for breast cancer. However, limited tumor-sequencing data from Hispanic/Latinas (H/L) are available to guide treatment. To address this gap, we performed whole-exome sequencing (WES) and RNA sequencing on 146 tumors and WES of matched germline DNA from 140 H/L women in California. Tumor intrinsic subtype, somatic mutations, copy-number alterations, and expression profiles of the tumors were characterized and compared with data from tumors of non-Hispanic White (White) women in The Cancer Genome Atlas (TCGA). Eight genes were significantly mutated in the H/L tumors including PIK3CA, TP53, GATA3, MAP3K1, CDH1, CBFB, PTEN, and RUNX1; the prevalence of mutations in these genes was similar to that observed in White women in TCGA. Four previously reported Catalogue of Somatic Mutations in Cancer (COSMIC) mutation signatures (1, 2, 3, 13) were found in the H/L dataset, along with signature 16 that has not been previously reported in other breast cancer datasets. Recurrent amplifications were observed in breast cancer drivers including MYC, FGFR1, CCND1, and ERBB2, as well as a recurrent amplification in 17q11.2 associated with high KIAA0100 gene expression that has been implicated in breast cancer aggressiveness. In conclusion, this study identified a higher prevalence of COSMIC signature 16 and a recurrent copy-number amplification affecting expression of KIAA0100 in breast tumors from H/L compared with White women. These results highlight the necessity of studying underrepresented populations. Significance: Comprehensive characterization of genomic and transcriptomic alterations in breast tumors from Hispanic/Latina patients reveals distinct genetic alterations and signatures, demonstrating the importance of inclusive studies to ensure equitable care for patients. See related commentary by Schmit et al., p. 2443

Funder

National Cancer Institute

Publisher

American Association for Cancer Research (AACR)

Subject

Cancer Research,Oncology

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