EDIT: I thought the DTC tests were somatic. That was lame. They are germline. The process I went through can help me if a somatic test finds mutations. But this particular snapshot was a waste of time, except for the AR variant. I probably have it, but to low to be picked up by my germline test.
Took a couple of hours but I searched 23andme for all possible DNA variants that predict BAT efficacy. Main ones are BRCA1/2, TP53, AR, PTEN, and in my case ATM. Then I ran them through Gemini, Perplexity, and ChatGPT. I did this multiple times and asked in various ways and in modes other than just research. For the final analysis and the beginning ones I used deep research modes. I need to follow up with some ctDNA and RNA testing. If I take the clinical accuracy as 100% (it isn't close but I can't estimate it), then the average prediction of synergy with a PARPi is about 99% and for SPA sensitivity, it is also about 99%.
I am going to follow up with FoundationOne tests if my insurance will cover.
If anyone is interested and has 23andme data (or likely data from other DTC services - DNA SNPs) it's straightforward to calculate something similar - but tedious.
Goto you.23andme.com/tools/data/ and search for a gene. Copy and paste into an AI. Ask the question: how does this predict bipolar androgen therapy efficacy?
You could also get your raw data (you.23andme.com/tools/data/.... You need to request it and I'm not sure how to process it.
Genetic Variants (SNPs)
Disclaimer
This information is for informational purposes only and is NOT medical advice. Interpretations based on Direct-to-Consumer (DTC) genetic data (e.g., specific rsIDs) for clinical decision-making—especially regarding cancer treatment—are unreliable and potentially misleading. Follow-up testing with prostate cancer–specific, FDA-approved assays is essential (e.g., FoundationOne Liquid CDx for BRCA2/TP53/AR status via ctDNA and FoundationOne RNA for AR mutations including the AR-V7 splice variant).
The clinical significance of these variants has not been clinically verified.
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DNA Variant Table (all of these variants were on the chip)
Gene/Marker Variant/rsID Genotype/Status Estimated Detection Accuracy Clinical Significance BAT Relevance
BRCA1 rs189382442 & rs552911643 T/T (biallelic) 25-50% Loss-of-function mutations lead to homologous recombination deficiency (HRD), rendering tumors more vulnerable to DNA damage. High sensitivity to BAT-induced DNA damage; enhances synergy with PARP inhibitors.
BRCA2 rs276174802 Loss-of-function 30-60% Biallelic inactivation results in HRD, increasing replication stress and double-strand breaks (DSBs) upon treatment. HRD tumors are highly sensitive to BAT, and this state synergizes with PARP inhibitors (e.g., olaparib).
TP53 rs78378222 (and others, e.g., rs1800372) T/T (pathogenic) 80%-95%(multiple variants detected) Impaired DNA repair that may amplify BAT-induced DNA damage, though associated with a more aggressive cancer phenotype. Enhances the therapeutic window for BAT—especially when combined with PARP inhibitors—by further compromising DNA repair.
AR rs201097725 C/C 95%-98% Variants may enhance AR signaling under supraphysiologic androgen (SPA) pulses, potentially increasing susceptibility to growth arrest induced by BAT. High AR dependency generally predicts a good BAT response, though resistance may emerge through AR downregulation.
ATM rs1800056 T/T (homozygous) 40%-60% A truncating mutation (p.Arg35Ter) leading to ATM loss-of-function, classified as pathogenic per ClinVar. A strong predictor of synergy when combining BAT with PARP inhibitors due to impaired double-strand break repair.
ATM rs587779826 T/T (homozygous) 40%-60% Likely pathogenic missense variant disrupting ATM kinase activity, also compromising the DNA repair process. Enhances synthetic lethality when BAT-induced DNA damage is paired with PARP inhibition.
Additional Note: Intact MSH2 status (suggesting microsatellite stability and no evidence of Lynch syndrome) is also relevant, though not included in the table.
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Summary of Clinical Implications & Recommendations
• Impact on BAT Efficacy:
o BRCA1/BRCA2 Loss-of-Function: High likelihood of deep and prolonged responses (PSA50 rates of ~67% for BRCA1 and ~47% for BRCA2; median PFS of ~11 and ~5.5 months, respectively).
o TP53 Mutations: Enhance sensitivity to BAT-induced DNA damage while indicating a potential for aggressive disease—requiring careful monitoring.
o AR Alterations: High AR dependency generally predicts a favorable BAT response.
o ATM Loss-of-Function: Predicted to synergize strongly with PARP inhibitors when used with BAT.
• Therapeutic Strategies:
1. BAT + PARP Inhibitors: Even in the absence of pathogenic BRCA2 mutations, BAT may downregulate BRCA2, creating an HRD-like state that is exploitable by PARP inhibitors (e.g., olaparib).
2. Biomarker Testing: Confirm HRD status via ctDNA testing (FoundationOne Liquid CDx) or tumor sequencing; consider additional functional assays (e.g., RAD51 foci assay).
3. Alternating Therapy: Cycling BAT with AR inhibitors (such as darolutamide) may exploit AR resensitization, as seen in the WOMBAT trial.
4. Combination with Immunotherapy: For patients with TP53/AR alterations, combining BAT with immunotherapy (e.g., nivolumab) may provide additional benefit (supported by COMBAT trial data).
• Overall Conclusion:
Your genetic profile—particularly the inactivation of BRCA1, the presence of TP53 mutations, and ATM loss-of-function—suggests potential benefit from combination therapies involving BAT with PARP inhibitors or immunotherapy. Ongoing monitoring of AR, TP53, and ATM status using liquid biopsies and approved genomic assays is recommended to guide treatment decisions.