서브메뉴
검색
Volumetric Assessment of Imaging Response in the PNOC Pediatric Glioma Clinical Trials
Volumetric Assessment of Imaging Response in the PNOC Pediatric Glioma Clinical Trials
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151059
- ISBN
- 9798382327563
- DDC
- 616
- 서명/저자
- Volumetric Assessment of Imaging Response in the PNOC Pediatric Glioma Clinical Trials
- 발행사항
- [Sl] : Yale University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 115 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
- 주기사항
- Advisor: Aboian, Mariam S.
- 학위논문주기
- Thesis (M.D.)--Yale University, 2024.
- 초록/해제
- 요약Response assessment in neuro-oncology relies on radiographic assessment of tumor burden on magnetic resonance (MR) imaging. The most widely used criteria were developed by the Response Assessment in Neuro-Oncology (RANO) group. The RANO criteria rely on bidimensional (2D) measurements of tumor on MR images. The RANO criteria were originally developed to assess response in adult high-grade glioma. However, the heterogeneous appearance of pediatric low-grade gliomas make application of RANO criteria challenging. Volumetric assessment of pediatric gliomas may offer a more comprehensive method for characterizing response.The goal of this thesis was to compare 2D and volumetric assessment methods in two pediatric glioma clinical trials from the Pacific Pediatric Neuro-Oncology Consortium (PNOC). The primary purpose of the thesis was to compare 2D and volumetric response to a clinical reference standard - neuroradiologist visual response assessment via the Brain Tumor Reporting and Data System (BT-RADS). A secondary aim was to determine optimal thresholds for categorizing volumetric response using BT-RADS as a reference standard. A third aim was to compare 2D and volumetric posttreatment trajectories in trial participants.Retrospective analyses of two pediatric glioma clinical trials (PNOC-001 and PNOC-002) were conducted. Changes in tumor 2D area, whole tumor volume, and solid tumor volume were compared to assess response. Follow-up images were assigned a response score on BT-RADS by two neuroradiologists. Empirical receiver operating characteristic (ROC) curves of changes in 2D area, whole, and solid tumor volume were constructed to classify partial response (PR) and progressive disease (PD) based on BT-RADS. In the PNOC-002 trial, a mathematical model was used to construct posttreatment trajectories of changes in 2D area and whole tumor volume in a subset of participants.Empirical ROC curves to classify BT-RADS PD among the 65 follow-up images assessed in the PNOC-001 trial yielded an AUC of 0.78 (95% CI: 0.66-0.90) for 2D area percent change, 0.84 (95% CI: 0.74-0.94) for whole volume percent change, and 0.96 (95% CI: 0.92-1.00) for solid volume percent change. DeLong tests revealed that there was a significant increase in AUC of the solid volume ROC curve compared to both 2D area (p = 0.005) and whole volume (p = 0.006). The empirical ROC curves to classify BT-RADS PR yielded an AUC of 0.87 (95% CI: 0.77-0.96) for 2D area percent change, 0.84 (95% CI: 0.70-0.99) for whole volume percent change, and 0.97 (95% CI: 0.94-1.00) for solid volume percent change. DeLong tests revealed that there was a significant increase in AUC of the solid volume ROC curve compared to 2D area (p = 0.02) but not whole volume (p = 0.08). The thresholds for solid volume percent change that included an 80% sensitivity in their 95% confidence intervals for classifying BT-RADS PD ranged from 15-25% and 15-20% for classifying BT-RADS PR.The empirical ROC curves for classification of BT-RADS PR in the 31 participants at the end of treatment or last available follow-up produced the following AUC values: 0.92 (95% CI: 0.80-1.00) for 2D area percent change, 0.99 (95% CI: 0.97- 1.00) for whole volume percent change, and 0.99 (95% CI: 0.97-1.00) for solid volume percent change. DeLong test revealed no statistically significant difference in AUC between 2D area and either solid (p = 0.17) or whole volume (p = 0.17) ROC curves. The empirical ROC curves for classification of BT-RADS PR at the first time of BTRADS PR detection produced the following AUC values: 0.84 (95% CI: 0.69-0.99) for 2D area percent change, 0.91 (95% CI: 0.80-1.00) for whole volume percent change, and 0.92 (95% CI: 0.82-1.00) for solid volume percent change. There was no statistically significant difference in AUC between the 2D area ROC curve and either solid (p = .34) or whole volume (p = .39) ROC curves based on DeLong tests. Based on mathematically modeled trajectories, there was no significant correlation in time to best response obtained from 2D area vs. whole volume posttreatment changes (ρ = 0.39, p = 0.054). Eight out of 25 participants (32%) had a difference of 90 days in transition time from partial response to stable disease between 2D area and whole volume trajectories. Moreover, of the 16 participants with tumor regrowth following stable disease, 50% had a difference of ≥ 90 days in transition time from stable disease to progressive disease between 2D area and whole volume trajectories.Solid tumor volume better predicted neuroradiologist assessment of partial response and progressive disease according to BT-RADS criteria in the PNOC-001 trial but performed as well as 2D measurements in classifying partial response in the PNOC-002 trial. Although volumetrics was not consistently superior to 2D measurements in detecting response in our study, there were differences in individual participant 2D and volumetric posttreatment trajectories. Future research comparing volumetric to 2D assessment in prospective trials is required to understand the significance of these differences to clinical management.
- 일반주제명
- Medical imaging
- 일반주제명
- Medicine
- 일반주제명
- Health sciences
- 키워드
- Brain tumors
- 키워드
- Neuro-oncology
- 키워드
- Neuroradiology
- 기타저자
- Yale University Yale School of Medicine
- 기본자료저록
- Dissertations Abstracts International. 85-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017160680
■00520250211151059
■006m o d
■007cr#unu||||||||
■020 ▼a9798382327563
■035 ▼a(MiAaPQ)AAI31142751
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a616
■1001 ▼aRamakrishnan, Divya.
■24510▼aVolumetric Assessment of Imaging Response in the PNOC Pediatric Glioma Clinical Trials
■260 ▼a[Sl]▼bYale University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a115 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-11, Section: B.
■500 ▼aAdvisor: Aboian, Mariam S.
■5021 ▼aThesis (M.D.)--Yale University, 2024.
■520 ▼aResponse assessment in neuro-oncology relies on radiographic assessment of tumor burden on magnetic resonance (MR) imaging. The most widely used criteria were developed by the Response Assessment in Neuro-Oncology (RANO) group. The RANO criteria rely on bidimensional (2D) measurements of tumor on MR images. The RANO criteria were originally developed to assess response in adult high-grade glioma. However, the heterogeneous appearance of pediatric low-grade gliomas make application of RANO criteria challenging. Volumetric assessment of pediatric gliomas may offer a more comprehensive method for characterizing response.The goal of this thesis was to compare 2D and volumetric assessment methods in two pediatric glioma clinical trials from the Pacific Pediatric Neuro-Oncology Consortium (PNOC). The primary purpose of the thesis was to compare 2D and volumetric response to a clinical reference standard - neuroradiologist visual response assessment via the Brain Tumor Reporting and Data System (BT-RADS). A secondary aim was to determine optimal thresholds for categorizing volumetric response using BT-RADS as a reference standard. A third aim was to compare 2D and volumetric posttreatment trajectories in trial participants.Retrospective analyses of two pediatric glioma clinical trials (PNOC-001 and PNOC-002) were conducted. Changes in tumor 2D area, whole tumor volume, and solid tumor volume were compared to assess response. Follow-up images were assigned a response score on BT-RADS by two neuroradiologists. Empirical receiver operating characteristic (ROC) curves of changes in 2D area, whole, and solid tumor volume were constructed to classify partial response (PR) and progressive disease (PD) based on BT-RADS. In the PNOC-002 trial, a mathematical model was used to construct posttreatment trajectories of changes in 2D area and whole tumor volume in a subset of participants.Empirical ROC curves to classify BT-RADS PD among the 65 follow-up images assessed in the PNOC-001 trial yielded an AUC of 0.78 (95% CI: 0.66-0.90) for 2D area percent change, 0.84 (95% CI: 0.74-0.94) for whole volume percent change, and 0.96 (95% CI: 0.92-1.00) for solid volume percent change. DeLong tests revealed that there was a significant increase in AUC of the solid volume ROC curve compared to both 2D area (p = 0.005) and whole volume (p = 0.006). The empirical ROC curves to classify BT-RADS PR yielded an AUC of 0.87 (95% CI: 0.77-0.96) for 2D area percent change, 0.84 (95% CI: 0.70-0.99) for whole volume percent change, and 0.97 (95% CI: 0.94-1.00) for solid volume percent change. DeLong tests revealed that there was a significant increase in AUC of the solid volume ROC curve compared to 2D area (p = 0.02) but not whole volume (p = 0.08). The thresholds for solid volume percent change that included an 80% sensitivity in their 95% confidence intervals for classifying BT-RADS PD ranged from 15-25% and 15-20% for classifying BT-RADS PR.The empirical ROC curves for classification of BT-RADS PR in the 31 participants at the end of treatment or last available follow-up produced the following AUC values: 0.92 (95% CI: 0.80-1.00) for 2D area percent change, 0.99 (95% CI: 0.97- 1.00) for whole volume percent change, and 0.99 (95% CI: 0.97-1.00) for solid volume percent change. DeLong test revealed no statistically significant difference in AUC between 2D area and either solid (p = 0.17) or whole volume (p = 0.17) ROC curves. The empirical ROC curves for classification of BT-RADS PR at the first time of BTRADS PR detection produced the following AUC values: 0.84 (95% CI: 0.69-0.99) for 2D area percent change, 0.91 (95% CI: 0.80-1.00) for whole volume percent change, and 0.92 (95% CI: 0.82-1.00) for solid volume percent change. There was no statistically significant difference in AUC between the 2D area ROC curve and either solid (p = .34) or whole volume (p = .39) ROC curves based on DeLong tests. Based on mathematically modeled trajectories, there was no significant correlation in time to best response obtained from 2D area vs. whole volume posttreatment changes (ρ = 0.39, p = 0.054). Eight out of 25 participants (32%) had a difference of 90 days in transition time from partial response to stable disease between 2D area and whole volume trajectories. Moreover, of the 16 participants with tumor regrowth following stable disease, 50% had a difference of ≥ 90 days in transition time from stable disease to progressive disease between 2D area and whole volume trajectories.Solid tumor volume better predicted neuroradiologist assessment of partial response and progressive disease according to BT-RADS criteria in the PNOC-001 trial but performed as well as 2D measurements in classifying partial response in the PNOC-002 trial. Although volumetrics was not consistently superior to 2D measurements in detecting response in our study, there were differences in individual participant 2D and volumetric posttreatment trajectories. Future research comparing volumetric to 2D assessment in prospective trials is required to understand the significance of these differences to clinical management.
■590 ▼aSchool code: 0265.
■650 4▼aMedical imaging
■650 4▼aMedicine
■650 4▼aHealth sciences
■653 ▼aBrain tumors
■653 ▼aNeuro-oncology
■653 ▼aNeuroradiology
■653 ▼aPediatric gliomas
■653 ▼aResponse assessment
■690 ▼a0574
■690 ▼a0564
■690 ▼a0566
■71020▼aYale University▼bYale School of Medicine.
■7730 ▼tDissertations Abstracts International▼g85-11B.
■790 ▼a0265
■791 ▼aM.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160680▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


