Lipoprotein(a) in Japanese Patients With Cardiovascular Disease: A Systematic Review.

Lipoprotein(a) [Lp(a)] is recognized as an independent risk factor for cardiovascular disease (CVD), but its characterization within the Japanese population remains unexplored. This systematic literature review synthesizes evidence on the association between Lp(a) levels and CVD in Japanese patients. To ensure comparability, the review focused on studies using the widely used LATEX-based immunoassay method. Most studies categorized patients into "high" and "low" Lp(a) groups; this review concentrates on findings from the "high" groups to evaluate the impact of elevated Lp(a). Although definitions of "high" Lp(a) varied, a consistent association between elevated Lp(a) and increased cardiovascular risk has been observed, aligning with international findings. Variability across studies was noted, likely due to differences in study design, endpoints, and follow-up durations. Although no approved therapies specifically target elevated Lp(a), several randomized controlled trials are currently ongoing. Continued research is essential to better understand the clinical implications of elevated Lp(a) among Japanese individuals.