DSG2 and Miyoshi myopathy: Multivariable Cox modelling demonstrated that overall, high DSG2 expression within MM PC at diagnosis retained its link with poor prognosis for both progression‐free survival (PFS) (HR 1.38, CI 1.06–1.79, P = 0.02) and OS (HR 1.52, CI 1.08–2.14, P = 0.02).