In the follow-up, the genetic subtype was seemingly not an independent predictor of new-onset AF (thin vs. thick-filament: 11% vs. 9%, P = 0.527 [Coppini et al.] and MYBPC3 vs. MYH7 vs. other genotypes: 31% vs. 37% vs. 18%, P = 0.15 [Bongini et al.]) in HCM patients (4, 12). The gene discussed is MYH7; the disease is atrial fibrillation.