Radioligand therapy pairs a tumor-targeting molecule — often a peptide or peptide-adjacent scaffold — with a therapeutic radionuclide that delivers radiation directly to cancer cells. The class is anchored by two Novartis peptide-based products: Lutathera (lutetium-177 DOTATATE, a somatostatin-receptor peptide) for neuroendocrine tumors, and Pluvicto (lutetium-177 PSMA-617, a PSMA-targeting peptide) for metastatic castration-resistant prostate cancer. Pluvicto's expansion into pre-chemotherapy use in 2026 made it one of the fastest-growing oncology products.
The 2026 pipeline broadens the targeting-vector and radionuclide options. Telix Pharmaceuticals' ProstACT Global Phase 3 tests TLX591-Tx (lutetium-177 rosopatamab, a PSMA radio-antibody-drug conjugate) and met primary safety objectives in its Part 1 lead-in at ASCO 2026. Aktis Oncology's AKY-2519 is a B7-H3-targeting miniprotein radioconjugate with first-in-human imaging data at ASCO 2026. Crinetics' CRN09682 links a nonpeptide SSTR2 agonist to a cytotoxic payload, and Perspective Therapeutics brought its lead-212 (²¹²Pb) alpha-emitter platform to ASCO 2026 across VMT-α-NET in neuroendocrine tumors, VMT01 in melanoma, and PSV359 in solid tumors. The field spans peptide ligands, miniproteins, antibodies, and small molecules as the targeting vector, with lutetium-177, actinium-225, and lead-212 across the radionuclide options.
Stories here cover radioligand and radioconjugate trial readouts across PSMA, SSTR2, and B7-H3 targets. See #psma, #telix-pharmaceuticals, and #aktis-oncology for adjacent threads.
ITM Isotope Technologies Munich SE received a Complete Response Letter (CRL) from the US FDA on August 7, 2026, disclosed August 10-11, for 177Lu-edotreotide (ITM-11), a somatostatin analog radioligand peptide therapeutic under investigation for gastroenteropancreatic neuroendocrine tumors (GEP-NETs). The CRL cited chemistry, manufacturing, and controls (CMC) and third-party commercial manufacturing facility items that must be addressed before the application can be approved. Notably, the FDA did not identify any concerns regarding the clinical data package, nonclinical data, or safety profile of ITM-11. The COMPETE trial (NCT03049189) evaluated 177Lu-edotreotide compared to everolimus (an oral mTOR inhibitor targeted molecular therapy) in patients with inoperable, progressive Grade 1 or Grade 2 GEP-NETs. ITM-11 is a peptide radioligand therapy: a somatostatin receptor 2 (SSTR2)-targeting peptide chelated to the beta-emitting radionuclide lutetium-177 to deliver targeted radiation to SSTR2-expressing neuroendocrine tumor cells. The category is anchored commercially by Novartis's Lutathera (177Lu-dotatate) and Pluvicto (177Lu-vipivotide tetraxetan, PSMA-targeting for prostate cancer). ITM intends to resubmit and complete the NDA review process. The manufacturing-focused CRL is a substantially better outcome than a clinical-data CRL: resolution timelines for CMC-only CRLs typically run 4-8 months versus 12+ months for data-driven CRLs, and the fundamental commercial thesis remains intact.
Lantheus's lutetium-177 dotatate ANDA (PNT2003), the first radioequivalent to Novartis's Lutathera, received FDA tentative approval on March 2, 2026; full approval is gated by the expiration of the 30-month Hatch-Waxman stay in June 2026. PNT2003 would launch into the gastroenteropancreatic neuroendocrine-tumor (GEP-NET) market alongside Lutathera and ahead of ITM-11 (Lu-edotreotide-177), which carries an August 28 PDUFA. Lantheus licensed PNT2003 from POINT Biopharma in December 2022, before Lilly's POINT acquisition.
The ASCO Annual Meeting closed June 2 after a week that moved peptide and targeted-conjugate oncology from abstract to podium: Bicycle's bicyclic peptide-drug conjugate and Avacta's FAP-activated conjugate in solid tumors, Mayo's folate-receptor and BioVaxys' survivin peptide vaccines, Sapience's C/EBPβ antagonist in glioblastoma, and PSMA and lead-212 radioligands from Telix and Perspective. Attention now shifts to ADA 2026 in New Orleans and the July 23-24 PCAC compounding vote.
Perspective Therapeutics presented progress on its three clinical lead-212 (²¹²Pb) targeted alpha-therapy programs at ASCO 2026: [212Pb]VMT-α-NET in somatostatin-receptor-2-positive neuroendocrine tumors, VMT01 in melanoma, and PSV359 in solid tumors. The NET program's earlier Phase 1/2a readout showed a 39% objective response rate in its second cohort and no dose-limiting toxicities at the 5.0 mCi dose, supporting movement toward a registrational trial. The platform pairs a peptide-based targeting vector with a short-range alpha emitter.
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.
AlphaGen Therapeutics presented preclinical data at AACR 2026 (April 22) showing its novel macrocyclic peptide-based alpha-emitter radioligand [212Pb]Pb-AG1206 binds fibroblast activation protein with picomolar affinity, achieving rapid tumor accumulation, renal clearance, and a high tumor-to-kidney ratio. A sister candidate [212Pb]Pb-AG1002 targets SSTR2 as a non-agonist alpha therapy for neuroendocrine tumors.
Perspective Therapeutics' [212Pb]VMT-α-NET, a first-in-class alpha-emitter peptide radionuclide therapy targeting SSTR2, achieved objective responses in 10 of 23 (43%) Cohort 2 patients with metastatic neuroendocrine tumors in Phase 1/2a data presented at AACR 2026. 18 of 25 patients (72%) remained alive without progression; no dose-limiting toxicities or Grade 4/5 adverse events observed.