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Immune and Circulating Tumor DNA Profiling After Radiation Treatment for Oligometastatic Non-Small Cell Lung Cancer: Translational Correlatives from a Mature Randomized Phase II Trial.

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Title:	Immune and Circulating Tumor DNA Profiling After Radiation Treatment for Oligometastatic Non-Small Cell Lung Cancer: Translational Correlatives from a Mature Randomized Phase II Trial.
Authors:	Tang, Chad^1,2 (AUTHOR), Lee, Won-Chul^3,4 (AUTHOR), Reuben, Alexandre⁴ (AUTHOR), Chang, Lianpeng⁵ (AUTHOR), Tran, Hai⁴ (AUTHOR), Little, Latasha³ (AUTHOR), Gumbs, Curtis³ (AUTHOR), Wargo, Jennifer^3,6 (AUTHOR), Futreal, Andrew³ (AUTHOR), Liao, Zhongxing¹ (AUTHOR), Xia, Xuefeng⁵ (AUTHOR), Yi, Xin⁵ (AUTHOR), Swisher, Steven G.⁷ (AUTHOR), Heymach, John V.⁴ (AUTHOR), Gomez, Daniel¹ (AUTHOR), Zhang, Jianjun^1,3,4 (AUTHOR) jzhang20@mdanderson.org
Source:	International Journal of Radiation Oncology, Biology, Physics. Feb2020, Vol. 106 Issue 2, p349-357. 9p.
Subjects:	Circulating tumor DNA, Non-small-cell lung carcinoma, DNA fingerprinting, Enzyme-linked immunosorbent assay, Lung cancer, Cytokines, Evaluation of medical care, Research, Sequence analysis, Genetic mutation, Clinical trials, Time, Research methodology, Lung tumors, Alleles, Evaluation research, Medical cooperation, Comparative studies, Randomized controlled trials, Gene expression profiling, T cells, Longitudinal method, Medical research
Abstract:	Purpose: NCT01725165 was a phase II prospective trial in which patients with non-small cell lung cancer were randomized to local consolidative therapy (LCT) versus maintenance therapy or observation (MT/O).Methods and Materials: Peripheral blood from patients enrolled on NCT01725165 were labeled as (1) baseline, (2) early follow-up (FU) if obtained in the first or second FU evaluation (6-18 weeks), and (3) late FU if obtained in the third to sixth FU evaluations (22-50 weeks). All patients who underwent LCT and were included in this analysis received radiation. Among 49 randomized patients, 21 patients underwent T cell CDR3 variable region sequencing using immunoSEQ, 31 patients underwent circulating tumor DNA (ctDNA) analysis using next-generation sequencing with a 1021 cancer gene panel, and cytokine concentration was assayed in 19 patients using enzyme-linked immunosorbent assay. All analyses were exploratory and not corrected for multiple testing.Results: No associations were identified between baseline T cell repertoire and ctDNA metrics with patient outcomes. Among baseline cytokines, interleukin 1α was the only cytokine associated with both overall survival (hazard ratio, 0.02; 95% confidence interval, 0.1-0.5; P = .0006) and progression-free survival (hazard ratio, 0.5; 95% confidence interval, 0.2-0.9; P = .03). At early FU, LCT was associated with decreased ctDNA burden, including lower number of detected mutations (median, 2 [interquartile range {IQR}, 1-6] vs 6 [IQR, 4-18]) and decreased average variable allele frequency (VAF; median, 0.006 [IQR, 0.003-0.010] vs 0.011 [IQR, 0.007-0.014]) compared with MT/O. Among 6 patients with serial ctDNA analysis, a rise in ctDNA detected mutation burden preceded clinical progression by 6.7 months. At early FU, LCT was associated with changes in T cell clonality that suggested oligoclonal expansion specifically increased T cell clonality (median, 0.15 [IQR, 0.12-0.24] vs 0.10 [IQR, 0.05-0.13]) and frequency of top 10 clones (median, 0.14 [IQR, 0.06-0.18] vs 0.21[IQR, 0.19-0.28]).Conclusion: LCT was associated with decreased ctDNA burden and oligoclonal expansion at early FU timepoints. Baseline interleukin 1α was associated with improved patient outcomes. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

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