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Title: MO-AB-BRA-06: Dynamic FLT PET for Investigating Potential Synergistic Therapeutic Targets During Anti-Angiogenic Treatment

Abstract

Purpose: Novel treatment strategies for metastatic cancer patients involve synergistically combining treatments with the hope of improving outcomes. This study investigated changes in tumor proliferative and vascular characteristics derived from dynamic [F-18]FLT PET during antiangiogenic treatment with the goal of identifying synergistic treatment opportunities. Methods: Patients with various solid cancers underwent continuous three-week cycles of anti-angiogenic treatment with intermittent dosing (two-weeks-on/one-week-off). Patients received up to six dynamic FLT PET/CT scans (days 0, 14, and 21 of cycle 1 (C1) and cycle 3 (C3)). Tumor proliferative (Kflt, net uptake rate) and vascular parameters (K1 blood-to-tissue transfer; Vb, vascular fraction) were calculated using a two-tissue compartment four-rate parameter kinetic model. Relative changes in these parameters, from day 0 to 14 (TxResp) and day 14 to 21 (offTxResp), were calculated. Significant differences were tested using Wilcoxon signed-rank test and significant correlations were tested using Spearman correlation. Results: Thirty patients were evaluable for C1 offTxResp with median values for Kflt, K1, and Vb of +30%, +35% and +30%, respectively. The fractions of patients with positive C1 offTxResp were: 21/30 for Ki, 24/30 for K1, 21/30 for Vb, and 12/30 had positive offTxResp for all three kinetic parameters. The offTxResp in C3 was not significantlymore » different from C1 for any of the kinetic parameters. Significant correlations were found between TxResp and offTxResp in C1 for Kflt (ρ=-0.52, p=0.014), K1 (ρ=−0.61, p=0.003) and Vb (ρ=−0.80, p<0.001). Similar correlations were found for Kflt (ρ=-1, p=0.017) and K1 (ρ=−1, p=0.017) for the five patients evaluable in C3. Conclusion: Dynamic FLT PET showed evidence of distinct vascular and proliferative increases during off treatment weeks that could potentially be targeted with synergistic therapy. Early changes in kinetic parameters were correlated with later changes suggesting potential for early prediction of vascular and proliferative changes during off treatment weeks.« less

Authors:
; ;  [1];  [2];  [1];  [3]
  1. University of Wisconsin-Madison, Madison, WI (United States)
  2. Jozef Stefan Institute, Ljubljana (Slovenia)
  3. (Slovenia)
Publication Date:
OSTI Identifier:
22649495
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 43; Journal Issue: 6; Other Information: (c) 2016 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; 61 RADIATION PROTECTION AND DOSIMETRY; CORRELATIONS; FLUORINE 18; KINETICS; NEOPLASMS; PATIENTS; POSITRON COMPUTED TOMOGRAPHY

Citation Formats

Scarpelli, M, Perlman, S, Liu, G, Simoncic, U, Jeraj, R, and Jozef Stefan Institute, Ljubljana. MO-AB-BRA-06: Dynamic FLT PET for Investigating Potential Synergistic Therapeutic Targets During Anti-Angiogenic Treatment. United States: N. p., 2016. Web. doi:10.1118/1.4957158.
Scarpelli, M, Perlman, S, Liu, G, Simoncic, U, Jeraj, R, & Jozef Stefan Institute, Ljubljana. MO-AB-BRA-06: Dynamic FLT PET for Investigating Potential Synergistic Therapeutic Targets During Anti-Angiogenic Treatment. United States. doi:10.1118/1.4957158.
Scarpelli, M, Perlman, S, Liu, G, Simoncic, U, Jeraj, R, and Jozef Stefan Institute, Ljubljana. 2016. "MO-AB-BRA-06: Dynamic FLT PET for Investigating Potential Synergistic Therapeutic Targets During Anti-Angiogenic Treatment". United States. doi:10.1118/1.4957158.
@article{osti_22649495,
title = {MO-AB-BRA-06: Dynamic FLT PET for Investigating Potential Synergistic Therapeutic Targets During Anti-Angiogenic Treatment},
author = {Scarpelli, M and Perlman, S and Liu, G and Simoncic, U and Jeraj, R and Jozef Stefan Institute, Ljubljana},
abstractNote = {Purpose: Novel treatment strategies for metastatic cancer patients involve synergistically combining treatments with the hope of improving outcomes. This study investigated changes in tumor proliferative and vascular characteristics derived from dynamic [F-18]FLT PET during antiangiogenic treatment with the goal of identifying synergistic treatment opportunities. Methods: Patients with various solid cancers underwent continuous three-week cycles of anti-angiogenic treatment with intermittent dosing (two-weeks-on/one-week-off). Patients received up to six dynamic FLT PET/CT scans (days 0, 14, and 21 of cycle 1 (C1) and cycle 3 (C3)). Tumor proliferative (Kflt, net uptake rate) and vascular parameters (K1 blood-to-tissue transfer; Vb, vascular fraction) were calculated using a two-tissue compartment four-rate parameter kinetic model. Relative changes in these parameters, from day 0 to 14 (TxResp) and day 14 to 21 (offTxResp), were calculated. Significant differences were tested using Wilcoxon signed-rank test and significant correlations were tested using Spearman correlation. Results: Thirty patients were evaluable for C1 offTxResp with median values for Kflt, K1, and Vb of +30%, +35% and +30%, respectively. The fractions of patients with positive C1 offTxResp were: 21/30 for Ki, 24/30 for K1, 21/30 for Vb, and 12/30 had positive offTxResp for all three kinetic parameters. The offTxResp in C3 was not significantly different from C1 for any of the kinetic parameters. Significant correlations were found between TxResp and offTxResp in C1 for Kflt (ρ=-0.52, p=0.014), K1 (ρ=−0.61, p=0.003) and Vb (ρ=−0.80, p<0.001). Similar correlations were found for Kflt (ρ=-1, p=0.017) and K1 (ρ=−1, p=0.017) for the five patients evaluable in C3. Conclusion: Dynamic FLT PET showed evidence of distinct vascular and proliferative increases during off treatment weeks that could potentially be targeted with synergistic therapy. Early changes in kinetic parameters were correlated with later changes suggesting potential for early prediction of vascular and proliferative changes during off treatment weeks.},
doi = {10.1118/1.4957158},
journal = {Medical Physics},
number = 6,
volume = 43,
place = {United States},
year = 2016,
month = 6
}
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