Phase 3, randomized, placebo-controlled trial of orteronel (TAK-700) plus prednisone in patients (pts) with chemotherapy-naïve metastatic castration-resistant prostate cancer (mCRPC) (ELM-PC 4 trial)
Bibliographic record
Abstract
5008 Background: Orteronel, an investigational, non-steroidal, selective 17,20-lyase inhibitor, demonstrated improved radiographic PFS (rPFS) but not OS in men with mCRPC post-docetaxel (Dreicer et al, ASCO GU 2014, Abstract 7). The double-blind ELM-PC 4 trial (NCT01193244) evaluated orteronel in pts with chemotherapy-naïve mCRPC. Methods: Men with progressive mCRPC (rising PSA and/or radiographic evidence) and testosterone < 50 ng/dL (post-orchiectomy or with maintained GnRH suppression) were randomized 1:1 to orteronel 400 mg twice daily (BID) + prednisone 5 mg BID (O+P) or placebo + prednisone (P), stratified by region and radiographic progressive disease at baseline. Co-primary endpoints were OS and rPFS. Based on 90% power to test OS (> 90% for rPFS), an initial HR of 1.25 in favor of orteronel was anticipated with 1454 pts and 900 deaths (pre-assigned alpha: OS 0.045, rPFS 0.005). The final analysis for rPFS was conducted at an interim analysis (IA) for OS; the final analysis for OS was conducted at 600 deaths, with 78% power. Results: 1560 pts were randomized. The study met the co-primary endpoint of rPFS; at the IA (final for rPFS), median rPFS with O+P v P was 11 v 8.3 months (HR 0.7; 95% CI: 0.5–0.8; P < .001). At the final analysis for OS the updated median rPFS benefit with O+P v P had increased to 5.1 months (median 13.8 v 8.7 mo; HR 0.7; 95% CI: 0.6–0.8; P < .00001). The co-primary endpoint of OS was not met. Median OS with O+P v P was 31.4 v 29.5 months (HR 0.9; 95% CI: 0.8–1.1; P = .314), with no notable differences across regions. More pts had a ≥ 50% PSA decrease (43% v 25%, P < .00001) and a favorable circulating tumor cell count (15% v 9%, P = .00016) at 12 weeks with O+P v P. Common all-grade adverse events with O+P v P included nausea (36% v 15%), fatigue (34% v 20%), constipation (33% v 15%), and diarrhea (28% v 14%); 30% v 18% of pts discontinued due to AEs. In O+P v P groups, 45% v 51% of pts received subsequent therapy, including docetaxel/abiraterone/enzalutamide in 31%/14%/6% v33%/20%/6%. Conclusion: O+P demonstrated a significant improvement in rPFS but no statistically significant improvement in OS v P in chemotherapy-naive mCRPC. Clinical trial information: NCT01193244.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.003 | 0.002 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.002 | 0.004 |
| Insufficient payload (model declined to judge) | 0.011 | 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".