Telix Pharmaceuticals is an Australian radiopharmaceutical company built around prostate cancer, where its gallium-68 PSMA-11 imaging agent Illuccix reached the market and now anchors a growing therapeutic pipeline. The company's lead therapy candidate is TLX591 (rosopatamab tetraxetan), a lutetium-177-labeled PSMA-targeting radio-antibody-drug conjugate.
At ASCO 2026, Telix reported that the Part 1 lead-in of its ProstACT Global Phase 3 trial met its primary safety objectives in patients with PSMA-positive metastatic castration-resistant prostate cancer, clearing the path to the randomized portion. ProstACT positions TLX591 against Novartis's Pluvicto (lutetium-177 PSMA-617), the small-molecule PSMA radioligand that defined the category, with the antibody-conjugate format offering a different pharmacokinetic profile. Telix is also developing imaging and therapy candidates in renal and other cancers.
Stories here cover Telix trial readouts and the PSMA radioligand race. See #prostact, #psma, and #radioligand for adjacent threads.
ASCO's Sunday education and poster sessions in Chicago set up the meeting's densest peptide-oncology day on Monday, June 1, when Bicycle Therapeutics presents Duravelo-2 (zelenectide pevedotin in first-line urothelial cancer, Abstract 4516), Mayo Clinic presents the TPIV200 folate-receptor-alpha vaccine in triple-negative breast cancer (Abstract 536), and Telix presents ProstACT Global PSMA radioligand data. Corbus CRB-701 and BioVaxys MVP-S round out the targeted-conjugate and vaccine slate.
ASCO 2026 Day 2 in Chicago continued the meeting's peptide-and-targeted-conjugate oncology programming. Saturday May 30 brought the Immutep eftilagimod alfa survival pooled analysis and the ImPact Biotech padeliporfin VTP pancreatic data, alongside the Bicycle Therapeutics zelenectide pevedotin dose-optimization poster (Abstract 4567, May 31) approaching. The meeting's heaviest peptide-mechanism day is Monday June 1: Bicycle Duravelo-2 zelenectide pevedotin + pembrolizumab oral presentation in 1L urothelial (Abstract 4516, 8:30 AM CT); Mayo Clinic TPIV200 folate-receptor peptide vaccine in triple-negative breast cancer (Abstract 536, 1:30 PM CT); Telix ProstACT PSMA radioligand Phase 3 Part 1; Sapience lucicebtide GBM poster. The Corbus CRB-701 Nectin-4 ADC data (42.9% OPSCC / 34.4% cervical) landed Friday May 29. The targeted-conjugate categories — Nectin-4, PSMA, B7-H3, FAP, SSTR2 — remain the densest peptide-adjacent oncology competition, with the bulk of definitive readouts concentrated in the meeting's back half through June 2.
Telix Pharmaceuticals reported ProstACT Global Phase 3 Part 1 data at ASCO 2026 as a late-breaking presentation. TLX591-Tx (lutetium-177 rosopatamab tetraxetan) — a PSMA-targeted lutetium radio-antibody-drug conjugate — met its primary safety objectives in the safety and dosimetry lead-in, demonstrating an acceptable tolerability profile with no new safety signals when combined with enzalutamide (Xtandi), abiraterone (Zytiga), or followed by docetaxel in PSMA-positive metastatic castration-resistant prostate cancer (mCRPC). ProstACT Global is an international Phase 3 trial evaluating TLX591-Tx plus standard of care versus standard of care alone. The drug sits in the PSMA-targeted radioligand class alongside Novartis's approved Pluvicto (lutetium-177 PSMA-617, a peptide-based radioligand), but uses an antibody rather than a small-molecule peptide as the targeting vector. The PSMA radioligand field — Pluvicto, ProstACT, plus the Aktis AKY-2519 B7-H3 miniprotein radioconjugate covered earlier this week — is one of the fastest-growing targeted-conjugate categories in oncology.