Evaluating Germline Testing Panels in Southern African Males With Advanced Prostate Cancer

Kazzem Gheybi, Jue Jiang, Shingai B.A. Mutambirwa, Pamela X.Y. Soh, Zsofia Kote-Jarai, Weerachai Jaratlerdsiri, Rosalind A. Eeles, M. S.Riana Bornman, Vanessa M. Hayes*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Background: Germline testing for prostate cancer is on the increase, with clinical implications for risk assessment, treatment, and management. Regardless of family history, NCCN recommends germline testing for patients with metastatic, regional, very-high-risk localized, and high-risk localized prostate cancer. Although African ancestry is a significant risk factor for aggressive prostate cancer, due to a lack of available data no testing criteria have been established for ethnic minorities. Patients and Methods: Through deep sequencing, we interrogated the 20 most common germline testing panel genes in 113 Black South African males presenting with largely advanced prostate cancer. Bioinformatic tools were then used to identify the pathogenicity of the variants. Results: After we identified 39 predicted deleterious variants (16 genes), further computational annotation classified 17 variants as potentially oncogenic (12 genes; 17.7% of patients). Rare pathogenic variants included CHEK2 Arg95Ter, BRCA2 Trp31Arg, ATM Arg3047Ter (2 patients), and TP53 Arg282Trp. Notable oncogenic variants of unknown pathogenicity included novel BRCA2 Leu3038Ile in a patient with early-onset disease, whereas patients with FANCA Arg504Cys and RAD51C Arg260Gln reported a family history of prostate cancer. Overall, rare pathogenic and earlyonset or familial-associated oncogenic variants were identified in 6.9% (5/72) and 9.2% (8/87) of patients presenting with a Gleason score $8 or $413 prostate cancer, respectively. Conclusions: In this first-ofits- kind study of southern African males,we provide support of African inclusion for advanced, early-onset, and familial prostate cancer genetic testing, indicating clinical value for 30% of current gene panels. Recognizing current panel limitations highlights an urgent need to establish testing guidelines formen of African ancestry.Weprovide a rationale for considering lowering the pathologic diagnostic inclusion criteria and call for further genome-wide interrogation to ensure the best possible African-relevant prostate cancer gene panel.

Original languageEnglish
Pages (from-to)289-296
Number of pages8
JournalJNCCN Journal of the National Comprehensive Cancer Network
Volume21
Issue number3
DOIs
Publication statusPublished - Mar 2023
Externally publishedYes

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