Impact of Genetic Testing and Sex Differences among Patients with Familial Hypercholesterolemia: The Hokuriku-plus Familial Hypercholesterolemia Registry Study

We aimed to clarify the degree and factors associated with low-density lipoprotein (LDL)-cholesterol treatment target attainment among patients with heterozygous familial hypercholesterolemia (HeFH) using the Hokuriku-plus FH registry. The Hokuriku-plus FH registry (UMIN000038210) was a prospective, observational, multicenter cohort study that enrolled consecutive patients with FH who fulfilled the clinical criteria for FH in Japan from 37 participating hospitals, mostly in the Hokuriku region, from April 2020 to March 2024. This registry collects data on clinical parameters, including lipid levels, physical findings, genetic background, and clinical events. In total, 431 patients were enrolled, and the median followup period was 3.1 years. We assessed the degree and factors associated with LDL-cholesterol treatment target attainment among patients with HeFH using the Hokuriku-plus FH registry. Among the 431 patients, sufficient data were collected from 386 patients. Logistic regression analysis revealed that male sex (odds ratio [OR] = 2.16, 95% confidence interval [CI]: 1.14-3.18, p＜0.001) and genetic testing (OR = 1.68, 95% CI: 1.10-2.26, p＜0.001) were significantly associated with LDL-cholesterol treatment target attainment. In fact, female patients were less likely to attain LDL-cholesterol treatment target than male patients (24.0% vs. 38.1%, p＜0.001), and patients who did not undergo genetic testing were less likely to attain LDL-cholesterol treatment target than those who underwent genetic testing (24.5% vs. 37.1%, p＜0.001). Sex bias and masked genetic status are significant barriers to the clinical management of patients with HeFH.