Department of Pediatric Hematology/Oncology;
King Faisal Specialist Hospital and Research Center;
Riyadh;
Saudi Arabia;
3De- partment of Pathology;
King Faisal Specialist Hospital and Research Center;
Riyadh;
Saudi Arabia;
Developmental Genetics Unit;
Department of Genetics;
King Faisal Specialist Hospital and Research Center;
Riyadh;
Saudi Arabia;
Human Cancer Genomic Research;
Research Center;
King Faisal Specialist Hospital and Research Cancer;
Riyadh;
Saudi Arabia;
Constitutional; Mismatch; Repair-Deficiency; (CMMR-D); Lynch; Syndrome; (LS); MLH1; MSH2; MSH6; and; PMS2; Biallelic; Germline; Mutations;