SPEN and microtia: It was shown that in MA, BRAF was the most frequently mutated gene (23 samples in a total of 28 MA cases, 82%), and NF1 (6/28), NOTCH1 (5/28), SPEN (5/28), AKT2 (4/28), APC (4/28), ATRX (3/28), and ETV4 (3/28) mutations were also frequently detected.