In terms of transparency of its review process and standards, for genomic tests, FDA publishes a detailed "Summary of Safety and Effectiveness" within a few months of approving a new test kit.
FDA approved the Oncomine Dx Express Test on July 2, 2025. The 85-page summary of the validation is online at FDA under PMA, P240040. Home page here.
https://www.accessdata.fda.gov/cdrh_docs/pdf24/P240040B.pdf
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Also available online at FDA is the summary of validation for Illumina Trusight Oncology Comprehensive. Find under PMA P230011, from August 21, 2024. On NextSeq 550dx.