Clovis Oncology, Inc. announced an oral presentation detailing initial Phase 1 data from the Clovis Oncology-sponsored Phase 1/2 LuMIERE clinical study (NCT04939610) investigating the safety, pharmacokinetics, dosimetry, and preliminary antitumor activity of its targeted radiotherapy candidate, FAP-2286 labelled with lutetium-177 (177Lu-FAP-2286). Overall, in nine patients treated in the first two dose cohorts,177Lu-FAP-2286 demonstrated a manageable safety profile and encouraging evidence of activity, including a confirmed RECIST partial response in one patient. In addition, updated data from an investigator-initiated Phase 1 study of FAP-2286 labelled with gallium-68 (68Ga-FAP-2286) as a novel imaging agent to identify metastatic cancer in patients with solid tumors are also being presented (NCT04621435).

These datasets will be presented in oral presentations by Jonathan McConathy, M.D., Ph.D., Associate Professor and Director of the Division of Molecular Imaging and Therapeutics in the University of Alabama at Birmingham Department of Radiology in the Marnix E. Heersink School of Medicine, and Brad Kline, Clinical Research Coordinator at the University of California, San Francisco (UCSF), respectively, at the Society of Nuclear Medicine & Molecular Imaging (SNMMI) Annual Meeting 2022 in Vancouver, British Columbia. FAP-2286 targets fibroblast activation protein (FAP), a promising theranostic target with expression across many tumor types. FAP-2286 is the first peptide-targeted radionuclide therapy (PTRT) and imaging agent targeting FAP to enter clinical development and is the lead candidate in Clovis Oncology's targeted radionuclide therapy (TRT) development program.

The Phase 1 portion of the LuMIERE study is evaluating the safety of the investigational therapeutic agent 177Lu-FAP-2286 to identify the recommended Phase 2 dose and schedule. The safety and tumor uptake of the imaging agent 68Ga-FAP-2286 is also being evaluated, with plans for Phase 2 expansion cohorts in multiple tumor types to initiate in Fourth Quarter 2022. Initial results from the Phase 1 portion of the ongoing Phase 1/2 LuMIERE study found treatment-emergent adverse events (TEAEs) to be generally mild to moderate among the nine patients in the safety population receiving 3.7 or 5.55 GBq/dose of the investigational therapeutic agent 177Lu-FAP-2286.

Three patients (33.3%) had a Grade =3 TEAE of back pain (11.1%), abdominal distension (11.1%), increased bilirubin (11.1%) and hyponatremia (11.1%); none were judged as related to 177Lu-FAP-2286. There was one serious adverse event (SAE) of back pain not related to 177Lu-FAP-2286. No dose-limiting toxicities were observed in the 3.7 or 5.55 GBq cohorts (n=3 evaluable in each cohort).

At the two dose levels evaluated to date, organ dosimetry revealed target organ exposure within the expected range to support administration of multiple doses. There was tumor uptake across a range of tumor types with prolonged tumor retention of 177Lu-FAP-2286 after dosing. A confirmed RECIST partial response was reported in one heavily pre-treated patient in the 3.7 GBq dose cohort with pseudomyxoma peritonei of appendiceal origin who completed six administrations of 177Lu-FAP-2286.

A decrease in the level of the serum tumor marker carcinoembryonic antigen (CEA) was also observed in the patient over the course of 177Lu-FAP-2286 administration. Recruitment for the third dose cohort (7.4 GBq) is ongoing. Presentation of the initial LuMIERE Phase 1 data, titled “177Lu-FAP-2286 in Patients With Advanced or Metastatic Solid Tumors: Initial Data From a Phase 1/2 Study Investigating Safety, Pharmacokinetics, Dosimetry, and Preliminary Antitumor Activity (LuMIERE)” (Abstract #2271), is scheduled for Tuesday, June 14 at 11:00 am PT, as part of the Basic Oncology: Early Phase Human Studies I session from 10:00 – 11:30 am PT.

Presentation of the investigator-initiated imaging study, titled “First-in-human evaluation of 68Ga-FAP-2286, a fibroblast activation protein targeted radioligand” (Abstract #2279), evaluating the ability of imaging agent 68Ga-FAP-2286 to detect metastatic cancer in patients with solid tumors, is scheduled for Tuesday, June 14 at 1:50 pm PT, as part of the Basic Oncology: Early Phase Human Studies II session from 1:00 – 2:30 pm PT.