[177Lu]Lu-DOTA-ZOL Bone Pain Palliation in Patients with Skeletal Metastases From Various Cancers: Efficacy and Safety Results

Abstract

Background: [177Lu]Lu-DOTA-ZOL has shown promising results from the dosimetry and preclinical aspects, but data on its role in the clinical efficacy is limited. In this light, the objective of this study is to evaluate the efficacy and safety of [177Lu]Lu-DOTA-ZOL as a bone pain palliation agent in patients experiencing pain due to skeletal metastases from various cancers.Methods: 40 patients experiencing bone pain due to skeletal metastases were enrolled in this study. The patients were treated with a mean cumulative dose of 2.1 ± 0.6 GBq (1.3–2.7 GBq) [177Lu]Lu-DOTA-ZOL in a median follow-up duration of 10 months (IQR: 8–14 months). The primary outcome endpoint was response assessment according to the visual analog score (VAS). Secondary endpoints included analgesic score (AS), global assessment pain score, Eastern Cooperative Oncology Group Assessment performance status (ECOG), Karnofsky Performance Status (KPS), overall survival, and safety assessment by the National Cancer Institute’s Common Toxicity Criteria V5.0.Results: 40 patients, 15 males, and 25 females with a mean age of 46.6 ± 15.08 years (range: 24–78 years) were treated with either 1 (N = 15) or 2 (N = 25) cycles of [177Lu]Lu-DOTA-ZOL. According to the VAS response assessment criteria, complete, partial, and minimal responses were observed in 11 (27.5%), 20 (50%), and 5 patients (12.5%), respectively with an overall response rate of 90%. Global pain assessment criteria revealed complete, partial, minimal and no response in 2 (5%), 25 (62.5%), 9 (22.5%), and 4 (10%) patients, respectively. Twenty eight patients died and the estimated median overall survival was 13 months (95% CI: 10–14 months). A significant improvement was observed in the VAS, AS and ECOG status when compared to baseline. None of the patients experienced grade III/IV hematological, kidney or hepatotoxicity due to [177Lu]Lu-DOTA-ZOL therapy.Conclusion: [177Lu]Lu-DOTA-ZOL shows promising results and is an effective radiopharmaceutical in the treatment of bone pain due to skeletal metastases from various cancers.