ATR and nonpapillary renal cell carcinoma: The ALT displays focal amplification of 12q14-15 (representing MDM2 and CDK4) with an otherwise stable genome and no copy number alterations in BRCA2, BRIP1, ATR or APC. In the ccRCC specimen, copy gains in BRCA2, BRIP1, ATR and APC can be observed within the context of a tetraploid tumour.