Analysis of Lumbar Spine Stenosis Specimens for Identification of Transthyretin Cardiac Amyloidosis
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 入组人数
- 1,663
- 试验地点
- 11
- 主要终点
- Percent of subjects with previous LSS surgery who have evidence of TTR amyloid deposits in their spinal specimen and could be at risk for ATTR cardiac amyloidosis
研究概览
简要总结
Primary objective:
To identify older adults with transthyretin cardiac amyloidosis (ATTR-CA) early in the course of the illness, at a time when disease modifying therapies are most effective.
The specific aims of this epidemiologic investigation include:
- To identify subjects with previous lumbar spinal stenosis (LSS) Surgery who have evidence of transthyretin (TTR) amyloid deposits in spinal specimens and could be at risk for ATTR cardiac amyloidosis.
- To evaluate for ATTR-CA among those with localized TTR in the spinal tissue.
The study will also explore the following:
- The prevalence of amyloid in lumbar spinal stenosis specimens by Congo Red staining.
- The prevalence of TTR deposits among subjects with amyloid as determined by mass spectrometry.
- Evaluation of a novel artificial intelligence technique for that can identify amyloid histologically with standard H&E staining.
- Difference in ATTR-CA prevalence between subjects with TTR and indeterminate amyloid deposits in subject's spine by myocardial uptake of technetium pyrophosphate scan (Tc99-PYP).
详细描述
This is a multicenter, prospective cohort study aimed at facilitating identification of individuals with ATTR-CA. Investigators will identify subjects with previous LSS surgery who have evidence of TTR amyloid deposits in spinal specimens. Subjects with localized TTR in spinal tissue will be invited to an on-site visit and be evaluated for the presence of clinical manifestations of ATTR cardiac amyloidosis (ATTR-CA).
Subjects will undergo nuclear scintigraphy, TTR genetic test, a clinical evaluation, electrocardiogram, and echocardiogram. Quality of life questionnaires will also be administered. Subjects who have myocardial retention of the imaging radiotracer with a Perugini score equal to 2 (uptake equal to bone) or 3 (uptake greater than bone) and confirmation by SPECT or SPECT/CT that the uptake is myocardial in nature and have no evidence of monoclonal proteins will be diagnosed with ATTR-CA.
This study is to be conducted at five study sites: Boston Medical Center, Cedars Sinai Medical Center, Cleveland Clinic, Columbia University Irving Medical Center, and Tufts University Medical Center. The Mayo Clinic will serve a Pathology research core to analyze spine specimens.
Most of the subjects are expected to complete all the study procedures and questionnaires on a single day.
Up to 1663 patients will be consented in this study to have spinal specimens examined for the presence of amyloid by Congo Red at the Mayo Clinic core lab. From the pool of subjects with amyloid detected (which anticipate will be 33% or at least 544), the investigators expect to recruit 163 participants to undergo cardiac phenotyping (Tc99m and cardiac evaluation). Among the 163 participants who undergo cardiac phenotyping, 98 will have TTR as the precursor protein identified by mass spectrometry and 65 will have an indeterminant precursor protein by mass spectrometry.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 年龄范围
- 50 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Clinically indicated spinal decompressive surgery within 20 years prior to enrollment.
- •Age ≥50 years at the time of the surgery.
- •Able to understand and sign the informed consent document after the nature of the study has been fully explained.
排除标准
- •The presence of any of the following excludes eligibility for enrollment in this study:
- •Confirmed primary amyloidosis (AL) or secondary amyloidosis (AA).
- •Known TTR amyloidosis.
- •Other reason that would make the subject inappropriate for entry into this study.
结局指标
主要结局
Percent of subjects with previous LSS surgery who have evidence of TTR amyloid deposits in their spinal specimen and could be at risk for ATTR cardiac amyloidosis
时间窗: up to 3 years
To identify who can be at risk for ATTR Cardiac Amyloidosis. The investigator is going to collect spinal ligamentum flavum specimens and stain with congo red and those who result positive for ATTR amyloid in their spinal specimen will be counted
次要结局
- Percent of subjects with ATTR-CA among those with localized TTR in their spinal tissue(up to 6 years)
研究者
Mathew S. Maurer, MD
Arnold and Arlene Goldstein Professor of Cardiology (in Medicine, Dept of Medicine Cardiology)
Columbia University