Relationship between a validated molecular cardiac transplant rejection classifier and routine organ function...

Area of Science:

• Cardiology
• Immunology
• Genomics

Background:

• Acute cellular cardiac allograft rejection is a systemic process.
• A peripheral blood mononuclear cell gene expression profiling (GEP) test is used to rule out significant rejection.
• This study investigates if GEP scores correlate with other clinical parameters.

Purpose of the Study:

• To determine if GEP test scores, designed to detect cardiac allograft rejection, correlate with routinely assessed clinical parameters.
• To explore the systemic implications of GEP scores in heart transplant recipients.

Main Methods:

• Retrospective analysis of 76 heart transplant patients undergoing GEP testing.
• Statistical analysis included t-tests, nonparametric tests, Spearman's correlation, and multivariate linear regression.
• Correlation between GEP scores and various clinical parameters was assessed.

Main Results:

• Elevated GEP scores correlated with longer QTc-interval, longer QRS duration, higher heart rate, and elevated serum creatinine.
• GEP scores also correlated with higher gamma-glutamyl transferase (GGT), lower oxygen saturation, lower platelet count, lower monocyte count, and lower HDL levels.
• Multivariate analysis identified QTc-interval and platelet count as independent predictors of GEP score.

Conclusions:

• The GEP test for cardiac rejection correlates with electrocardiographic, hemodynamic, renal, hepatic, bone marrow, and lipid metabolism parameters.
• This suggests a complex interplay between immune response, leukocytes, and overall organ function in heart transplant patients.
• GEP may offer insights into the systemic state of patients beyond just cardiac rejection status.