PLAG1 and maternal uniparental disomy of chromosome 20: In addition, we observed recurrent 8q12.1 and 8q24.1‐22 amplifications in both MBCs and UCSs, encompassing the CHCHD7 (9%, 3/35 MBCs; 9%, 5/55 UCSs), PLAG1 (9%, 3/35 MBCs; 9%, 5/55 UCSs), MYC (26%, 9/35 MBCs; 11%, 6/55 UCSs), and NDRG1 (23%, 8/35 MBCs; 9%, 5/55 UCSs) oncogenes (Fig. S1a).