Fanconi anemia (FA) is characterized by physical abnormalities, bone marrow failure, and increased risk for malignancy. Physical abnormalities, present in approximately 75% of affected individuals, include one or more of the following: short stature, abnormal skin pigmentation, skeletal malformations of the upper and/or lower limbs, microcephaly, and ophthalmic and genitourinary tract anomalies. Progressive bone marrow failure with pancytopenia typically presents in the first decade, often initially with thrombocytopenia or leukopenia. The incidence of acute myeloid leukemia is 13% by age 50 years. Solid tumors – particularly of the head and neck, skin, and genitourinary tract – are more common in individuals with FA.

Any malignant glioma in which the cause of the disease is a mutation in the BRCA2 gene.

Mismatch repair cancer syndrome-2 (MMRCS2) is an autosomal recessive childhood cancer predisposition syndrome characterized by hematologic malignancy, brain tumors, and gastrointestinal tumors. Multiple cafe-au-lait spots reminiscent of neurofibromatosis type I (NF1; 162200) may be present. Microsatellite instability may be detected in tumor samples (Muller et al., 2006). For a discussion of genetic heterogeneity of mismatch repair cancer syndrome (MMRCS), see MMRCS1 (276300).

Bone marrow failure and diabetes mellitus syndrome (BMFDMS) is an autosomal recessive disorder characterized by the onset of manifestations of bone marrow failure, such as anemia, thrombocytopenia, and dyserythropoiesis, in infancy or early childhood. White blood cell lineages may or may not be affected. Patients with BMFDMS also develop nonautoimmune insulin-dependent diabetes mellitus in the first or second decades, likely due to apoptosis of pancreatic beta cells. Many patients show pigmentary skin abnormalities and short stature. Bone marrow transplant is curative for the bone marrow failure, but does not have an effect on diabetes (Dos Santos et al., 2017).