To explore a possible connection between CPT1A expression and osteoclastogenesis, the RA patients were further divided into two groups based on the relative gene expression levels of CPT1A in CD14+ monocytes, CPT1Alow group (CPT1A < 3) and CPT1Ahigh group (CPT1A > 3). The gene discussed is CPT1A; the disease is rheumatoid arthritis.