title: External beam radiotherapy synergizes ¹⁸⁸Re-liposome against human esophageal cancer xenograft and modulates ¹⁸⁸Re-liposome pharmacokinetics.
abstract: External beam radiotherapy (EBRT) treats gross tumors and local microscopic diseases. Radionuclide therapy by radioisotopes can eradicate tumors systemically. Rhenium 188 ((188)Re)-liposome, a nanoparticle undergoing clinical trials, emits gamma rays for imaging validation and beta rays for therapy, with biodistribution profiles preferential to tumors. We designed a combinatory treatment and examined its effects on human esophageal cancer xenografts, a malignancy with potential treatment resistance and poor prognosis. Human esophageal cancer cell lines BE-3 (adenocarcinoma) and CE81T/VGH (squamous cell carcinoma) were implanted and compared. The radiochemical purity of (188)Re-liposome exceeded 95%. Molecular imaging by NanoSPECT/CT showed that BE-3, but not CE81T/VGH, xenografts could uptake the (188)Re-liposome. The combination of EBRT and (188)Re-liposome inhibited tumor regrowth greater than each treatment alone, as the tumor growth inhibition rate was 30% with EBRT, 25% with (188)Re-liposome, and 53% with the combination treatment at 21 days postinjection. Combinatory treatment had no additive adverse effects and significant biological toxicities on white blood cell counts, body weight, or liver and renal functions. EBRT significantly enhanced the excretion of (188)Re-liposome into feces and urine. In conclusion, the combination of EBRT with (188)Re-liposome might be a potential treatment modality for esophageal cancer.
authors.affiliation: Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, Taiwan ; Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan.
authors.forename: Chih-Hsien
authors.initials: CH
authors.lastname: Chang
authors.affiliation: Department of Medical Research MacKay Memorial Hospital, Taipei, Taiwan.
authors.forename: Shin-Yi
authors.initials: SY
authors.lastname: Liu
authors.affiliation: Department of Medical Research MacKay Memorial Hospital, Taipei, Taiwan.
authors.forename: Chih-Wen
authors.initials: CW
authors.lastname: Chi
authors.affiliation: Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, Taiwan.
authors.forename: Hsiang-Lin
authors.initials: HL
authors.lastname: Yu
authors.affiliation: Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, Taiwan.
authors.forename: Tsui-Jung
authors.initials: TJ
authors.lastname: Chang
authors.affiliation: Institute of Traditional Medicine, National Yang-Ming University, Taipei, Taiwan.
authors.forename: Tung-Hu
authors.initials: TH
authors.lastname: Tsai
authors.affiliation: Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, Taiwan.
authors.forename: Te-Wei
authors.initials: TW
authors.lastname: Lee
authors.affiliation: Department of Medical Research MacKay Memorial Hospital, Taipei, Taiwan ; Institute of Traditional Medicine, National Yang-Ming University, Taipei, Taiwan ; Department of Radiation Oncology, MacKay Memorial Hospital, Taipei, Taiwan.
authors.forename: Yu-Jen
authors.initials: YJ
authors.lastname: Chen
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy; D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry / Q000493:pharmacokinetics / Q000494:pharmacology; D002294:Carcinoma, Squamous Cell / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy; D003131:Combined Modality Therapy; D004938:Esophageal Neoplasms / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy*; D006801:Humans; D008081:Liposomes / Q000737:chemistry* / Q000493:pharmacokinetics; D008297:Male; D008807:Mice, Inbred BALB C; D053758:Nanoparticles / Q000008:administration & dosage / Q000737:chemistry; D011868:Radioisotopes / Q000493:pharmacokinetics / Q000627:therapeutic use; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics / Q000627:therapeutic use; D011878:Radiotherapy / Q000379:methods*; D012211:Rhenium / Q000737:chemistry / Q000493:pharmacokinetics / Q000494:pharmacology*; D014018:Tissue Distribution; D023041:Xenograft Model Antitumor Assays
chemical_list: D000970:Antineoplastic Agents; D008081:Liposomes; D011868:Radioisotopes; D019275:Radiopharmaceuticals; D012211:Rhenium
keywords: Radionuclide therapy; biodistribution; liposome; teletherapy