Study of Pulmonary MRI for the Diagnosis of Bronchiolitis Obliterans Syndrome After Allogeneic Stem Cell Transplantation (IRM-A)
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|ClinicalTrials.gov Identifier: NCT04080232|
Recruitment Status : Not yet recruiting
First Posted : September 6, 2019
Last Update Posted : September 23, 2019
|Condition or disease||Intervention/treatment||Phase|
|Bronchiolitis Obliterans||Device: lung MRI||Not Applicable|
Patients undergoing allogeneic stem cell transplantation may develop non-infectious respiratory complication related to chronic graft versus host disease and called bronchiolitis obliterans syndrome (BOS). The occurrence of BOS is associated with a decreased survival reaching 13% at 5 years (Dudek et al, BBMT 2003). Thus, screening and diagnosis of BOS appear as a priority of post-transplant patients monitoring, in order to begin early therapy if needed. To this end, patients undergo systematic and regular screening using pulmonary function tests (PFTs). In case of abnormal PFTs, tests are completed the screening of respiratory infections and chest computed tomographic scan (CT-scan) is performed. A report from the National Institute of Health described the following criteria required for the diagnosis of BOS : FEV1/vital capacity < 0.7, FEV1 < 75% or a decline >/= 10% from baseline, residual volume > 120%, absence of documented infection, and the presence of CT-scan signs suggestive of BOS : air trapping by expiratory CT or small airway thickening or bronchiectasis.
BOS severity depends on the development of fibrotic and fixed damages, poorly responding to therapies. New tools are needed in order to favor early BOS diagnosis.
A recent study from our center showed that repeated CT-scans in stem cell transplant patients is associated with increased risk of neoplasia. In addition, recent studies from our center evaluated the use of pulmonary MRI providing good performance without X-ray exposure (Dournes G et al, Radiology 2015 et Dournes G et al, Eur Radiol 2015).
More recently, Renne et al (Radiology 2015) studied the performance of pulmonary MRI coupled with oxygen transfer analysis for the diagnosis of chronic lung allograft dysfunction. This study showed altered imaging parameters in patients developing BOS, including patients with early BOS stage (0p stage).
As pathogenic mechanisms seem to be shared between post-stem cell transplant and post-lung transplant BOS, we hypothesize that pulmonary MRI with oxygen transfer analysis and ultra short echo time may represent a non-invasive, non-irradiating and sensitive research tool for the detection and quantification of pulmonary lesions in patients screened for post-stem cell transplant BOS.
Thus, 20 patients who underwent allogeneic stem cell transplantation and show abnormal respiratory function over a 2 year period study are expected. They will be included according to the following criteria : age > 18 yo, > 3 months post-transplant, absence of documented pulmonary infection, or with a minimum of 6 weeks after a documented pulmonary infection, and the following BOS criteria : abnormal PFTs (FEV1/VC < 0.7, FEV1 < 0.75, residual volume < 120% of expected value) and/or chest CT-scan showing air trapping or small airway thickening. Similarly to lung transplant criteria, stage 0p BOS defined according to FEF25-75 values (Estenne et al, JHLT 2002), for which pulmonary MRI with oxygen transfer may guide to early BOS diagnosis, will be added.
Patients who give their consent will perform a pulmonary MRI, in the absence of contraindication, using different sequences to evaluate morphologic and functional performances of pulmonary MRI. We will compare CT-scan and MRI performances using blinded analysis from two radiologists.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||20 participants|
|Intervention Model:||Single Group Assignment|
|Masking:||None (Open Label)|
|Official Title:||Study of Pulmonary MRI for the Diagnosis of Bronchiolitis Obliterans Syndrome After Allogeneic Stem Cell Transplantation|
|Estimated Study Start Date :||September 24, 2019|
|Estimated Primary Completion Date :||September 24, 2020|
|Estimated Study Completion Date :||September 24, 2020|
Experimental: Lung MRI
lung MRI concordance as compared to chest CT-scan for the description of morphological abnormalities necessary for the diagnosis of BOS after HSCT. It will be evaluated using lung MRI performed after inclusion (D0) using a standardized procedure
Device: lung MRI
lung MRI (1.5T Siemens Aera) using the following sequences: 3D Fast gradient-echo pulse sequences with ultra-short echo time (UTE), acquisitions at end-inspiration breath hold, end-expiration breath hold, and free-breathing using an echonavigator positioned on the diaphragm, acquisitions using routine pulse sequences (SSFP, T2FSE) and the administration of oxygen during the MRI: O2 will be administered at 15L/min during 6 minutes.
- lung MRI concordance as compared to chest CT-scan [ Time Frame: Baseline ]lung MRI concordance as compared to chest CT-scan for the description of morphological abnormalities necessary for the diagnosis of BOS after HSCT. It will be evaluated using lung MRI performed after inclusion (Baseline) using a standardized procedure. The agreement between MRI and chest CT-scan for the presence or absence of the following features, will be measured at the segmental level: airway thickening, bronchiectasis, air trapping.
- Bhalla Score precision in morphological MRI [ Time Frame: Baseline ]Measure of Bhalla Score precision in morphological MRI for the diagnosis of post-transplant BOS
- Bhalla Score in CT scan [ Time Frame: Baseline ]Bhalla Score in CT scan
- oxygen transfer capacity [ Time Frame: Baseline ]Measure of oxygen transfer capacity (percentage of intra-pulmonary signal variation before and after inhalation of oxygen);
- Force Expiratory Volume [ Time Frame: Baseline ]Force Expiratory Volume (FEV, l)
- FEV1/VC [ Time Frame: Baseline ]FEV1/VC (Tiffeneau),
- Residual volume [ Time Frame: Baseline ]Residual volume (l)
- total lung capacity [ Time Frame: Baseline ]Total lung capacity (l)
- BOS stages [ Time Frame: Baseline ]BOS stages (0 : FEV1 > 90%, and FEF25-75 > 75% from baseline; 0p : 10-19% decrease in FEV1, and/or by a >/= 25% decrease in FEF 25-75 from baseline; 1: FEV1 60-79% ; 2: FEV1 40-59% ; 3: FEV1</= 39)
- intra-observer repeatability of the Bhalla score in CT scan [ Time Frame: Baseline ]Intraclass coefficient and Bland-Altman's test
- intra-observer repeatability of the Bhalla score in MRI [ Time Frame: Baseline ]Intraclass coefficient and Bland-Altman's test
- intra-observer repeatability of the measure of oxygen transfer capacity [ Time Frame: Baseline ]Intraclass coefficient and Bland-Altman's test
- inter-observer reproducibility of the Bhalla score in CT scan [ Time Frame: Baseline ]Intraclass coefficient and Bland-Altman's test
- inter-observer reproducibility of the Bhalla score in MRI [ Time Frame: Baseline ]Intraclass coefficient and Bland-Altman's test
- inter-observer reproducibility of the measure of oxygen transfer capacity [ Time Frame: Baseline ]Intraclass coefficient and Bland-Altman's test
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04080232
|Contact: Edouard Forcade, MD||335 57 65 65 firstname.lastname@example.org|
|Contact: Elodie Blanchard, MDemail@example.com|
|Contact: Edouard Forcade, MD firstname.lastname@example.org|