A group of genes that works together to produce a person’s physical characteristics. Prior to the identification of the genes and genetic mutations that cause Fanconi anemia (FA), patients with the disease were classified into sub-categories known as complementation groups based on the patient’s cellular features. These complementation groups correspond to the various FA genes (e.g., individuals who belong to complementation group A have mutations in the FANCA gene, whereas individuals who belong to complementation group B have mutations in the FANCB gene).
« Back to Glossary IndexNews
Related News

Aug 11th, 2025
Everything we do at the Fanconi Cancer Foundation (FCF) starts with the individual, because understanding the lived experience of FA is essential to improving care, advancing research, and strengthening support. As gene therapy and other promising treatments move from clinical...

Jun 21st, 2024
In a world where every day presents new challenges, my 11-year-old son, Omar, from Oman, stands out for his resilience and eagerness to raise awareness about Fanconi anemia. Diagnosed at just five years old, we truly believe his journey is a testament to hope and the strength of the human spirit.

Sep 17th, 2025
What started as a small local fundraiser in memory of an incredible little girl has evolved into a powerful movement uniting friends, family, neighbors, and supporters in pursuit of a future with better outcomes and brighter hope for families affected by FA.