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    GENE:

    RAD51C (RAD51 paralog C)

    i
    Other names: RAD51C, RAD51 paralog C, R51H3, BROVCA3, RAD51L2
    1d
    RADIOLA: Predicting Olaparib Sensitivity in Patients With Unresectable Locally Advanced/Metastatic HER2-negative Breast Cancer. (clinicaltrials.gov)
    P2, N=65, Completed, SOLTI Breast Cancer Research Group | Recruiting --> Completed
    Trial completion
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    HER-2 (Human epidermal growth factor receptor 2) • PGR (Progesterone receptor) • BRCA1 (Breast cancer 1, early onset) • BRCA2 (Breast cancer 2, early onset) • PALB2 (Partner and localizer of BRCA2) • RAD51 (RAD51 Homolog A) • RAD51C (RAD51 paralog C) • RAD51D (RAD51 paralog D)
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    BRCA2 mutation • BRCA1 mutation • HER-2 amplification • HER-2 negative • PALB2 mutation • PGR positive • RAD51C mutation • RAD51D mutation • HER-2 negative + AR positive + ER positive
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    Lynparza (olaparib)
    4d
    KAT2B-mediated epigenetic suppression of RAD51C enhances olaparib sensitivity in colorectal cancer. (PubMed, Cancer Chemother Pharmacol)
    These results offer vital and novel insights into the combination of inhibitors in patients who are resistant to olaparib therapy, especially patients with RAD51C reversion mutations.
    Journal • BRCA Biomarker • PARP Biomarker
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    BRCA1 (Breast cancer 1, early onset) • BRCA2 (Breast cancer 2, early onset) • BRCA (Breast cancer early onset) • RAD51C (RAD51 paralog C)
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    BRCA2 mutation • BRCA1 mutation • RAD51C mutation • BRCA mutation
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    Lynparza (olaparib)
    9d
    Integrating breast tumour homologous recombination deficiency status to aid germline BRCA1 and BRCA2 variant classification. (PubMed, EBioMedicine)
    Analysis across multiple tumour whole-genome sequencing datasets has shown that HR status prediction algorithms can separate profiles for BRCA1 and BRCA2 pathogenic variants and provide further evidence at increased weight to aid in the classification of germline BRCA1 and BRCA2 variants. Tumour sequencing offers a promising strategy for reducing the uncertainty in germline variant interpretation.
    Journal • BRCA Biomarker
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    TP53 (Tumor protein P53) • BRCA1 (Breast cancer 1, early onset) • BRCA2 (Breast cancer 2, early onset) • PTEN (Phosphatase and tensin homolog) • ATM (ATM serine/threonine kinase) • HRD (Homologous Recombination Deficiency) • PALB2 (Partner and localizer of BRCA2) • BRCA (Breast cancer early onset) • CHEK2 (Checkpoint kinase 2) • BRIP1 (BRCA1 Interacting Protein C-terminal Helicase 1) • RAD51C (RAD51 paralog C) • RAD51D (RAD51 paralog D) • BARD1 (BRCA1 Associated RING Domain 1)
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    HRD
    15d
    BCDX2-CX3 and DX2-CX3 complexes assemble and stabilize RAD51 filaments. (PubMed, Nature)
    These distinct assemblies are differentially regulated by ATPase activity, defining a dynamic BCDX2-CX3 "loader" and a stable DX2-CX3 "anchor" that provide functional modularity to the HR machinery. This work provides a unifying mechanism for human RAD51 paralog function and delivers an atomic blueprint for interpreting disease-causing mutations.
    Journal
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    RAD51 (RAD51 Homolog A) • RAD51B (RAD51 Paralog B) • RAD51C (RAD51 paralog C) • RAD51D (RAD51 paralog D) • XRCC2 (X-Ray Repair Cross Complementing 2) • XRCC3 (X-Ray Repair Cross Complementing 3)
    25d
    D5330C00004: Ascending Doses of Ceralasertib in Combination With Chemotherapy and/or Novel Anti Cancer Agents (clinicaltrials.gov)
    P1/2, N=357, Active, not recruiting, AstraZeneca | Trial completion date: Dec 2025 --> Jun 2026
    Trial completion date
    |
    HER-2 (Human epidermal growth factor receptor 2) • ATM (ATM serine/threonine kinase) • HRD (Homologous Recombination Deficiency) • BRCA (Breast cancer early onset) • RAD51C (RAD51 paralog C) • RAD51D (RAD51 paralog D)
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    HER-2 negative • HRD • PALB2 mutation • RAD51C mutation • BRCA mutation
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    Lynparza (olaparib) • carboplatin • Imfinzi (durvalumab) • ceralasertib (AZD6738) • saruparib (AZD5305)
    25d
    RAD51C-XRCC3 complex regulates FANCM-mediated R-loop resolution to safeguard genome integrity. (PubMed, Sci Adv)
    The CX3 complex-mediated R-loop resolution is independent of its fork maintenance function. Collectively, we demonstrate a previously unidentified role of the CX3 complex in preventing R-loop-induced genome instability by regulating FANCM-mediated R-loop resolution.
    Journal
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    RAD51 (RAD51 Homolog A) • RAD51C (RAD51 paralog C) • FANCM (FA Complementation Group M) • XRCC3 (X-Ray Repair Cross Complementing 3)
    27d
    SPORE: A Study of Pembrolizumab and Olaparib for People With Metastatic Pancreatic Ductal Adenocarcinoma and Homologous Recombination Deficiency or Exceptional Treatment Response to Platinum-Based Therapy (clinicaltrials.gov)
    P2, N=63, Active, not recruiting, Memorial Sloan Kettering Cancer Center | Trial completion date: Jan 2026 --> Jan 2027 | Trial primary completion date: Jan 2026 --> Jan 2027
    Trial completion date • Trial primary completion date
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    BRCA1 (Breast cancer 1, early onset) • BRCA2 (Breast cancer 2, early onset) • ATM (ATM serine/threonine kinase) • BAP1 (BRCA1 Associated Protein 1) • CHEK2 (Checkpoint kinase 2) • RAD51 (RAD51 Homolog A) • FANCA (FA Complementation Group A) • BRIP1 (BRCA1 Interacting Protein C-terminal Helicase 1) • RAD51C (RAD51 paralog C) • RAD50 (RAD50 Double Strand Break Repair Protein) • BARD1 (BRCA1 Associated RING Domain 1) • NBN (Nibrin Nijmegen Breakage Syndrome 1 (Nibrin)) • ABRAXAS1 (Abraxas 1 BRCA1 A Complex Subunit 2) • FANCC (FA Complementation Group C)
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    MSK-IMPACT
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    Keytruda (pembrolizumab) • Lynparza (olaparib)
    28d
    PARPi-PANC: Niraparib as First Line Therapy With Metastatic Homologous Repair-deficient Pancreatic Cancer (clinicaltrials.gov)
    P2, N=2, Terminated, Centre Leon Berard | Withdrawn --> Terminated; Study not feasible, patient accrual rate too low.
    Trial termination
    |
    BRCA1 (Breast cancer 1, early onset) • BRCA2 (Breast cancer 2, early onset) • FANCA (FA Complementation Group A) • RAD51B (RAD51 Paralog B) • BRIP1 (BRCA1 Interacting Protein C-terminal Helicase 1) • RAD51C (RAD51 paralog C) • RAD51D (RAD51 paralog D) • BARD1 (BRCA1 Associated RING Domain 1) • NBN (Nibrin Nijmegen Breakage Syndrome 1 (Nibrin)) • RAD54L (DNA Repair And Recombination Protein RAD54) • FANCL (FA Complementation Group L) • PPP2R2A (Protein Phosphatase 2, Regulatory Subunit B, Alpha) • FANCD2 (FA Complementation Group D2)
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    Zejula (niraparib)
    29d
    Homologous recombination deficiency in primary ER-positive and HER2-negative breast cancer. (PubMed, Commun Med (Lond))
    ERpHER2n HRD tumors show features of aggressive disease, but do not display a distinct transcriptional or DNA methylation profile that clearly differentiates them from HR-proficient tumors. Though numbers are limited, we present early evidence that HRD stratification by WGS could impact therapeutic strategies, as HRD BCs trended to poorer outcomes when not treated with chemotherapy.
    Journal • BRCA Biomarker
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    HER-2 (Human epidermal growth factor receptor 2) • ER (Estrogen receptor) • BRCA1 (Breast cancer 1, early onset) • BRCA2 (Breast cancer 2, early onset) • HRD (Homologous Recombination Deficiency) • PALB2 (Partner and localizer of BRCA2) • RAD51C (RAD51 paralog C)
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    HER-2 positive • ER positive • HER-2 negative • HRD • ER positive + HER-2 negative • HER-2 negative + ER positive
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    Prosigna™ Breast Cancer Prognostic Gene Signature Assay
    1m
    Uptake of cascade tests in relatives of patients undergoing cancer precision medicine in Japan. (PubMed, Jpn J Clin Oncol)
    The uptake level of cascade test can be acceptable. Hospitals need to maintain contact with the young untested relatives until they have achieved sufficient growth to undertake cascade test.
    Journal • BRCA Biomarker
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    BRCA1 (Breast cancer 1, early onset) • BRCA2 (Breast cancer 2, early onset) • CDKN2A (Cyclin Dependent Kinase Inhibitor 2A) • BAP1 (BRCA1 Associated Protein 1) • CDK4 (Cyclin-dependent kinase 4) • MSH2 (MutS Homolog 2) • RAD51C (RAD51 paralog C)
    1m
    Pembrolizumab, Olaparib, and Temozolomide for People With Glioma (clinicaltrials.gov)
    P2, N=57, Recruiting, Memorial Sloan Kettering Cancer Center | Trial completion date: Jan 2026 --> Jan 2027 | Trial primary completion date: Jan 2026 --> Jan 2027
    Trial completion date • Trial primary completion date
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    EGFR (Epidermal growth factor receptor) • BRCA1 (Breast cancer 1, early onset) • BRCA2 (Breast cancer 2, early onset) • HRD (Homologous Recombination Deficiency) • CDKN2A (Cyclin Dependent Kinase Inhibitor 2A) • FGFR (Fibroblast Growth Factor Receptor) • CDK12 (Cyclin dependent kinase 12) • CDKN2B (Cyclin Dependent Kinase Inhibitor 2B) • CHEK2 (Checkpoint kinase 2) • RAD51B (RAD51 Paralog B) • BRIP1 (BRCA1 Interacting Protein C-terminal Helicase 1) • RAD51C (RAD51 paralog C) • RAD51D (RAD51 paralog D) • CHEK1 (Checkpoint kinase 1) • BARD1 (BRCA1 Associated RING Domain 1) • RAD54L (DNA Repair And Recombination Protein RAD54) • FANCL (FA Complementation Group L) • PPP2R2A (Protein Phosphatase 2, Regulatory Subunit B, Alpha)
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    CDKN2A deletion • BRIP1 mutation • RAD51C mutation • RAD51B mutation • BARD1 mutation • IDH wild-type
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    Keytruda (pembrolizumab) • Lynparza (olaparib) • temozolomide
    1m
    Evaluation of homologous recombination testing in ovarian carcinoma. (PubMed, Virchows Arch)
    The five HRD assays varied significantly in HRD detection rates in high-grade serous OC. The results support the applicability of genomic instability analyses to assess HRD, while also highlighting the need to improve harmonization across different assays when HRD is used for therapeutic decision making.
    Journal
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    BRCA1 (Breast cancer 1, early onset) • HRD (Homologous Recombination Deficiency) • RAD51C (RAD51 paralog C)
    |
    HRD