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Fanconi Anemia

Inherited bone marrow failure syndrome with chromosomal instability requiring vigilant surveillance and curative HSCT

Written by: Saygı Hospital Health Guide Editorial Board
Published:

This content is for general information; please consult your physician for diagnosis and treatment.

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What is Fanconi Anemia?

Fanconi anemia — autosomal recessive (occasionally X-linked or autosomal dominant) inherited bone marrow failure syndrome; caused by biallelic mutations in any of 22 FANC genes (FA/BRCA DNA repair pathway); chromosomal breakage with DNA crosslinking agents (diepoxybutane or mitomycin C) diagnostic.

Clinical features — physical findings (short stature, café-au-lait spots, thumb/radial ray anomalies, microcephaly, GU anomalies, skeletal anomalies) in 60-75%, but 25-40% have no obvious congenital anomalies; progressive bone marrow failure typically in school-age years; markedly elevated cancer risk across all ages.

Cancer predisposition — MDS/AML risk 30-40% by age 40; solid tumor risk 20-30% including squamous cell carcinoma of head/neck/vulva/cervix/anus, breast, esophageal cancers; earlier age of onset compared to sporadic cases; hematopoietic stem cell transplant does not eliminate solid tumor risk.

Treatment paradigm — close hematologic surveillance (CBC every 3 months, bone marrow annually from age 3), androgens (oxymetholone, danazol) for cytopenias, allogeneic HSCT for severe marrow failure/MDS/AML (using reduced-intensity conditioning due to DNA repair defects), aggressive cancer surveillance for life, gene therapy trials emerging.

Symptoms

Gradual onset pancytopenia — fatigue, bleeding, recurrent infections
Short stature, growth failure, microcephaly
Café-au-lait macules and hypopigmented lesions
Thumb and radial ray anomalies (absent/hypoplastic/bifid thumb)
Genitourinary anomalies — horseshoe kidney, hypospadias, cryptorchidism
Developmental delay (some), endocrine dysfunction (growth hormone, thyroid, glucose abnormalities)

Risk Factors

Family history of Fanconi anemia or inherited bone marrow failure
Ashkenazi Jewish or Afrikaner ancestry (founder mutations)
Consanguineous marriage
FANCA (60%), FANCC (15%), FANCG (10%) most common complementation groups
FANCD1/BRCA2 or FANCN/PALB2 — especially high cancer risk
Unexplained progressive cytopenias in a child

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Child with unexplained progressive pancytopenia, especially with any congenital anomalies (short stature, thumb anomalies, café-au-lait spots), warrants urgent pediatric hematology referral and chromosomal breakage test (DEB or MMC).
  • Known Fanconi anemia patient with any new symptoms — unexplained lump/mass, persistent sore throat/oral lesion, or progressive cytopenia — requires immediate evaluation for secondary malignancy.
  • Family history of Fanconi anemia, especially in siblings or close relatives, requires genetic counseling and testing of children, including newborn screening for early intervention.

Treatment Methods

01
Diagnostic workup — chromosomal breakage test with diepoxybutane (DEB) or mitomycin C (MMC) on peripheral blood lymphocytes (increased breaks diagnostic), followed by genetic testing panel for FANC gene mutations, complementation group analysis, parental testing for genetic counseling, baseline bone marrow biopsy for staging.
02
Supportive care — monitoring growth, endocrine, hearing, vision every 6-12 months; transfusion support for symptomatic cytopenias (leukoreduced, irradiated, CMV-negative products); antibiotic prophylaxis for neutropenia; vaccinations per pediatric hematology guidelines.
03
Androgen therapy — oxymetholone (initial 2-5 mg/kg/day) or danazol for cytopenias when transfusion-dependent but no donor; responses 50-70% for red cells, less for platelets/granulocytes; side effects include virilization, hepatotoxicity, liver adenomas; used as bridge to transplant.
04
Hematopoietic stem cell transplantation — only curative therapy for marrow failure; matched sibling donor preferred (85-95% long-term survival), unrelated and haploidentical expanding; reduced-intensity conditioning (fludarabine-low dose cyclophosphamide +/- TBI 2-4 Gy) due to DNA repair defect; best outcomes before transfusion-related complications and clonal evolution.
05
Cancer surveillance — oral examination every 6 months from age 10 with brush biopsy of suspicious lesions, Pap smears, breast self-exam and imaging, esophageal endoscopy for Barrett surveillance, MDS/AML monitoring with annual bone marrow from age 5; lifelong monitoring post-HSCT.
06
Emerging therapies — gene therapy via lentiviral vector correction of FANCA (Barcelona/Fred Hutch trials) showing preliminary efficacy in restoring hematopoiesis without myeloablative conditioning; somatic reversion can lead to spontaneous improvement (not predictable); eltrombopag and other agents investigated.

Which Department to Visit?

You can visit our Hematoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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