Development and validation of a novel nomogram to predict the impact of the polymorphism of the ICAM‐1 gene on the prognosis of ischemic cardiomyopathy

Abstract

AbstractThe current study investigated the association between polymorphisms of the ICAM‐1 gene and prognosis of Ischemic cardiomyopathy (ICM), and developed a prognostic nomogram for ICM on the basis of ICAM‐1 gene variants. The current study included totally 252 patients with ICM. In addition, PCR‐RFLP (polymerase chain reaction‐restriction fragment length polymorphism) was used to genotype SNPs in the ICAM‐1 gene in the patients. Later, the nomogram model was built by combining clinical data and ICAM‐1 gene variants. This study used the least absolute shrinkage and selection operator (LASSO) regression model to optimize feature selection into an ICM prognostic model. Furthermore, multivariate Cox‐regression was applied to build the prognostic model, which included clinical and gene features chosen by the LASSO regression model. Following that, the receiver operating characteristic (ROC) curve, C‐index, calibration plot analyses and decision curve analysis (DCA) were carried out to evaluate the discrimination ability, consistency, and clinical utility of the prognostic model, and the bootstrap method was adopted for internal validation. predicting factors rs112872667, treating by PCI or CABG, ventricular arrhythmia, left ventricular end‐diastolic diameter (LVDD), use of β‐blockers, systolic blood pressure (SBP), heart rate (HR), and serum sodium were incorporated into the prognostic nomogram. The constructed nomogram performed well in discrimination ability, as observed by the time‐dependent C‐index. Furthermore, as shown by calibration curves, our nomogram's predicted probabilities were highly consistent with measured values. With threshold probabilities, DCA suggested that our nomogram could be useful in the clinic. mutation of rs112872667 have critical predictive value on the prognosis of ICM, ICM patients with the mutant genotype (CT or TT) have higher survival probability than those with the wild genotype (CC). Mutation of rs112872667 in ICAM‐1 gene have critical predictive value on the prognosis of ICM, ICM patients with the mutant genotype (CT or TT) have higher survival probability than those with the wild genotype (CC).