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Ref Type Journal Article
PMID (30209161)
Authors De Laere B, Oeyen S, Mayrhofer M, Whitington T, van Dam PJ, Van Oyen P, Ghysel C, Ampe J, Ost P, Demey W, Hoekx L, Schrijvers D, Brouwers B, Lybaert W, Everaert EG, De Maeseneer D, Strijbos M, Bols A, Fransis K, Beije N, de Kruijff IE, van Dam V, Brouwer A, Goossens D, Heyrman L, Van den Eynden GG, Rutten A, Del Favero J, Rantalainen M, Rajan P, Sleijfer S, Ullén A, Yachnin J, Grönberg H, Van Laere SJ, Lindberg J, Dirix LY
Title TP53 Outperforms Other Androgen Receptor Biomarkers to Predict Abiraterone or Enzalutamide Outcome in Metastatic Castration-Resistant Prostate Cancer.
Journal Clinical cancer research : an official journal of the American Association for Cancer Research
Vol 25
Issue 6
Date 2019 Mar 15
URL
Abstract Text To infer the prognostic value of simultaneous androgen receptor (AR) and TP53 profiling in liquid biopsies from patients with metastatic castration-resistant prostate cancer (mCRPC) starting a new line of AR signaling inhibitors (ARSi).Experimental Design: Between March 2014 and April 2017, we recruited patients with mCRPC (n = 168) prior to ARSi in a cohort study encompassing 10 European centers. Blood samples were collected for comprehensive profiling of CellSearch-enriched circulating tumor cells (CTC) and circulating tumor DNA (ctDNA). Targeted CTC RNA sequencing (RNA-seq) allowed the detection of eight AR splice variants (ARV). Low-pass whole-genome and targeted gene-body sequencing of AR and TP53 was applied to identify amplifications, loss of heterozygosity, mutations, and structural rearrangements in ctDNA. Clinical or radiologic progression-free survival (PFS) was estimated by Kaplan-Meier analysis, and independent associations were determined using multivariable Cox regression models.Overall, no single AR perturbation remained associated with adverse prognosis after multivariable analysis. Instead, tumor burden estimates (CTC counts, ctDNA fraction, and visceral metastases) were significantly associated with PFS. TP53 inactivation harbored independent prognostic value [HR 1.88; 95% confidence interval (CI), 1.18-3.00; P = 0.008], and outperformed ARV expression and detection of genomic AR alterations. Using Cox coefficient analysis of clinical parameters and TP53 status, we identified three prognostic groups with differing PFS estimates (median, 14.7 vs. 7.51 vs. 2.62 months; P < 0.0001), which was validated in an independent mCRPC cohort (n = 202) starting first-line ARSi (median, 14.3 vs. 6.39 vs. 2.23 months; P < 0.0001).In an all-comer cohort, tumor burden estimates and TP53 outperform any AR perturbation to infer prognosis.See related commentary by Rebello et al., p. 1699.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
TP53 inact mut prostate cancer no benefit Abiraterone Clinical Study - Cohort Actionable In a clinical study, treatment with either Xtandi (enzalutamide) or Zytiga (abiraterone) in patients with metastatic castration-resistant prostate cancer harboring a TP53 inactivating mutation, detected via circulating tumor cells, demonstrated a shorter progression-free survival (3.0 vs 8.7mo; P<0.0001) and overall survival (7.8 vs 26.7mo; P<0.0001) and fewer patients with a PSA response greater than or equal to 50% (15.4 vs 46.8%; P=0.008) compared to those patients with wild-type TP53 (PMID: 30209161). 30209161
TP53 inact mut prostate cancer no benefit Enzalutamide Clinical Study - Cohort Actionable In a clinical study, treatment with either Xtandi (enzalutamide) or Zytiga (abiraterone) in patients with metastatic castration-resistant prostate cancer harboring a TP53 inactivating mutation, detected via circulating tumor cells, demonstrated a shorter progression-free survival (3.0 vs 8.7mo; P<0.0001) and overall survival (7.8 vs 26.7mo; P<0.0001) and fewer patients with a PSA response greater than or equal to 50% (15.4 vs 46.8%; P=0.008) compared to those patients with wild-type TP53 (PMID: 30209161). 30209161