This is a single-center, non-randomized, single-arm, open-label exploratory clinical study of ¹⁷⁷Lu-CTR-FAPI in patients with FAP-high expressing metastatic solid tumors, with a focus on breast cancer, sarcoma, and thyroid cancer. The purpose of this study is to evaluate the safety and tolerability of ¹⁷⁷Lu-CTR-FAPI. The study will also assess its in vivo biodistribution, radiation absorbed dose in normal organs and target lesions, and preliminary clinical efficacy. The main question this study aims to answer is whether ¹⁷⁷Lu-CTR-FAPI can be administered safely and shows sufficient tumor-targeting and preliminary therapeutic activity to support further clinical investigation in patients with FAP-high expressing metastatic solid tumors.
This is an investigator-initiated, single-center, non-randomized, single-arm, open-label exploratory clinical trial of ¹⁷⁷Lu-CTR-FAPI in patients with FAP-high expressing metastatic solid tumors. Participants will receive ¹⁷⁷Lu-CTR-FAPI by intravenous infusion. The planned standard activity is 200 mCi (7.4 GBq) ±10%, administered every 6±1 weeks for up to 4 cycles. Dose reduction to 100 mCi (3.7 GBq) may be performed according to predefined toxicity criteria. During the first treatment cycle, participants will undergo intensive blood sampling and serial imaging to evaluate biodistribution and radiation dosimetry. Whole-body planar imaging and localized quantitative SPECT/CT will be performed at multiple time points from approximately 1 hour to 7-9 days after the initial administration. Regions of interest will be drawn for source organs and target lesions, and time-activity curves will be generated to estimate cumulative activity. Absorbed doses to normal organs and tumor lesions will be calculated using OLINDA/EXM software. Safety will be monitored throughout the study by vital signs, physical examinations, laboratory tests, 12-lead electrocardiograms, and adverse event recording. Adverse events will be coded and graded according to CTCAE v5.0, with particular attention to hematologic, hepatic, and renal toxicities. Tumor imaging evaluations will be performed according to the study schedule. Preliminary efficacy will be assessed using RECIST 1.1, including objective response rate and progression-free survival. Statistical analyses will be descriptive, and missing data will not be imputed.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
12
a novel covalent targeted radioligand (CTR), ¹⁷⁷Lu-CTR-FAPI, utilizing a sulfur(VI) fluoride exchange (SuFEx) click chemistry-based strategy
The Second Hospital & Clinical Medical School, Lanzhou University
Lanzhou, Gansu, China
Number of Participants With Treatment-Emergent Adverse Events
Number of participants with treatment-emergent adverse events, serious adverse events, and adverse events leading to treatment discontinuation. Adverse events will be coded and graded according to the Common Terminology Criteria for Adverse Events version 5.0.
Time frame: From first administration of [¹⁷⁷Lu]Lu-CTR-FAPI through 6 weeks after the last administration
Number of Participants With Abnormal Vital Signs
Number of participants with clinically significant abnormal vital signs, including systolic blood pressure, diastolic blood pressure, heart rate, respiratory rate, body temperature, and oxygen saturation, as determined by the investigator.
Time frame: From first administration of [¹⁷⁷Lu]Lu-CTR-FAPI through 6 weeks after the last administration
Number of Participants With Abnormal Laboratory Test Results
Number of participants with clinically significant abnormal laboratory test results, including complete blood count, liver function tests, renal function tests, and serum electrolytes, graded according to the Common Terminology Criteria for Adverse Events version 5.0 when applicable.
Time frame: From first administration of [¹⁷⁷Lu]Lu-CTR-FAPI through 6 weeks after the last administration
Objective Response Rate
Objective response rate is defined as the proportion of participants with a best overall response of complete response or partial response according to RECIST version 1.1.
Time frame: Every 8 weeks from baseline until disease progression, initiation of new anticancer therapy, withdrawal, death, or study completion, up to 12 months
Progression-Free Survival
Progression-free survival is defined as the time from the first administration of \[¹⁷⁷Lu\]Lu-CTR-FAPI to the first documented disease progression according to RECIST version 1.1 or death from any cause, whichever occurs first.
Time frame: From first administration of [¹⁷⁷Lu]Lu-CTR-FAPI until disease progression or death, up to 12 months
Radiation dosimetry
Through whole-body planar imaging, local SPECT/CT quantitative tomographic imaging combined with blood sample determination, the radiation absorption doses of normal organs and target lesions were calculated using the OLINDA/EXM software.
Time frame: It should be measured within 1 hour to 7 to 9 days after the first administration of the drug.
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