In around half of the cases, genes which are involved in homologous recombination (EMSY transcriptional repressor, BRCA2 interacting (EMSY), phosphatase and tensin homolog (PTEN), RAD51 paralog C (RAD51C), ATM serine/threonine kinase (ATM), ATR serine/threonine kinase (ATR), Fanconi anemia genes) were impaired. Here, ATR is linked to Fanconi anemia.