PLA1A expression in BRAF-WT/MUT type and NRAS-WT/MUT type by immunohistochemistry is shown in Fig. 4A. Morphometrically, all high-grade nodular MM samples, which were categorized as BRAF/NRAS-MUT, showed high PLA1A expression with significant intensity. Here, PLA1A is linked to Miyoshi myopathy.