TALAPRO-1: An open-label, response rate phase II study of talazoparib (TALA) in men with DNA damage repair (DDR) defects and metastatic castration-resistant prostate cancer (mCRPC) who previously received taxane-based chemotherapy (CT) and progressed on greater than or equal to one novel hormonal therapy (NHT).
Bibliographic record
Abstract
TPS342 Background: There are no approved therapies for mCRPC that has progressed on taxane and NHT. Preclinical studies showed that DDR-positive prostate tumors may be sensitized to PARP inhibition. TALA inhibits PARP, causing cell death in BRCA1/2-mutated cells. Methods: This study (NCT03148795) is enrolling patients (pts) (N ≈ 100) with measurable soft tissue disease per RECIST v1.1, progressive mCRPC, DDR likely to sensitize to PARP inhibition, ECOG performance status ≤ 2, and no brain metastases, who received 1-2 CT regimens (including ≥ 1 taxane-based CT) and progressed on ≥ 1 NHT (enzalutamide/abiraterone acetate). Prior use of PARP inhibitors, cyclophosphamide, mitoxantrone, or platinum-based CT ≤ 6 mos before study or progression on a platinum-based CT at any time are excluded. Pts will receive TALA 1 mg/d orally (pts with moderate renal impairment, 0.75 mg/d) until radiographic progression, unacceptable toxicity, or withdrawal of consent. TALA should not be discontinued based on increased prostate specific antigen (PSA) or circulating tumor cell (CTC) count alone. Primary endpoint is best objective response (OR) rate (complete/partial soft tissue response; exact 2-sided 95% confidence interval). Responses must be confirmed ≥ 4 wks later by computed tomography/magnetic resonance imaging with no evidence of bone progression ≥ 6 wks later per PCWG3 criteria. Secondary endpoints include time to OR, duration of response, PSA decrease ≥ 50%, CTC count conversion (to CTC = 0 and < 5 per 7.5 mL of blood), time to PSA progression, radiographic progression-free survival, overall survival, safety, pt-reported outcomes, and pharmacokinetics of TALA. Efficacy will be assessed every 8 wks for the first 24 wks, then every 12 wks thereafter. An initial safety and efficacy analysis will be performed on 20 pts after ≥ 8 wks of treatment. An interim efficacy analysis is planned when 60 pts have completed ≥ 6 mos of treatment. This study was sponsored by Pfizer Inc. Previously presented at ESMO 2018, FPN 859TiP, De Bono JS et al. Reused with permission. Clinical trial information: NCT03148795.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.009 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".