title: In-vivo Comparison of18F-FLT uptake, CT Number, Tumor Volume in Evaluation of Repopulation during Radiotherapy for Lung cancer.
abstract: Accelerated repopulation has been observed in various tumors. This study was aimed to evaluate the potential of 3'-deoxy-3'-18F-fluorothymidine (18F-FLT) uptake and Computed Tomography Number (CTN) in monitoring tumor responses to radiotherapy compared with tumor volume (TV) changes. Tumor bearing nude mice were assigned to either irradiated daily or every second day group and then randomized to 6 sub-groups to receive 0Gy, 6Gy, 12Gy, 18Gy, 24Gy, 36Gy irradiation, respectively. TV was measured every 3 days.18F-FLT micro-PET/CT scans were performed after irradiation being completed. Tumor sections were stained to calculate the immunohistochemical (Ki-67) labeling index (LI). Comparison analysis between FLT uptake parameters, CTNs, VTs and Ki-67 LI results were conducted to determine the correlation. Ki-67 LI increased significantly after 6 times of irradiation at irradiated daily group and after 3 times at irradiated every second day group, suggesting accelerated repopulation. No shrinkage of TV was noticed at two groups during irradiation delivery. Both18F-FLT uptake and CTN increased significantly after irradiation of 12Gy/6f/6d and 6Gy/3f/6d. Comparison analysis found a significant relationship between Ki-67 LI and18F-FLT uptake parameters as well as CTN. Both18F-FLT PET and CT have the potential to reflect the tumor proliferative response during radiation delivery.
authors.affiliation: Department of Oncology, Renmin Hospital of Wuhan University, Wuhan, China.|Department of Radiation Oncology, Shandong Cancer Hospital Affiliated to Shandong University, Shandong Academy of Medical Science, Jinan, China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Oncology, Renmin Hospital of Wuhan University, Wuhan, China.|Department of Radiation Oncology, Shandong Cancer Hospital Affiliated to Shandong University, Shandong Academy of Medical Science, Jinan, China.|Shandong Academy of Medical Sciences, Jinan University, Jinan, China.
authors.forename: Jinming
authors.initials: J
authors.lastname: Yu
authors.affiliation: Department of Radiation Oncology, Shandong Cancer Hospital Affiliated to Shandong University, Shandong Academy of Medical Science, Jinan, China.|Shandong Academy of Medical Sciences, Jinan University, Jinan, China.
authors.forename: Chengming
authors.initials: C
authors.lastname: Li
authors.affiliation: Department of Radiation Oncology, Shandong Cancer Hospital Affiliated to Shandong University, Shandong Academy of Medical Science, Jinan, China.|Shandong Academy of Medical Sciences, Jinan University, Jinan, China.
authors.forename: Xindong
authors.initials: X
authors.lastname: Sun
authors.affiliation: Department of Radiation Oncology, Shandong Cancer Hospital Affiliated to Shandong University, Shandong Academy of Medical Science, Jinan, China.|Shandong Academy of Medical Sciences, Jinan University, Jinan, China.
authors.forename: Xue
authors.initials: X
authors.lastname: Meng
mesh_terms: D000072283:A549 Cells; D000818:Animals; D015224:Dideoxynucleosides / Q000493:pharmacokinetics*; D005260:Female; D006801:Humans; D019394:Ki-67 Antigen / Q000378:metabolism; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000532:radiotherapy*; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D049268:Positron-Emission Tomography; D014057:Tomography, X-Ray Computed; D047368:Tumor Burden
chemical_list: D015224:Dideoxynucleosides; D019394:Ki-67 Antigen; C002854:alovudine