Clonal hematopoiesis (CH), where few blood stem cells produce a significant fraction of mature blood cells that are genetically identical, is partly an inevitable feature of aging. Certainly, it is near universal in those older than 60. CH is not itself a disease, but 1%-2% of CH cases progress to acute myeloid leukemia, and it raises the risk of some other types of cancer as well. A total of eight genes are responsible for 95% of CH cases, George Vassiliou told the audience in Saturday’s plenary session at the 2026 Annual Congress of the European Hematology Association (EHA 2026).

Clonal hematopoiesis (CH), where few blood stem cells produce a significant fraction of mature blood cells that are genetically identical, is partly an inevitable feature of aging. Certainly, it is near universal in those older than 60. CH is not itself a disease, but 1%-2% of CH cases progress to acute myeloid leukemia, and it raises the risk of some other types of cancer as well. A total of eight genes are responsible for 95% of CH cases, George Vassiliou told the audience in Saturday’s plenary session at the 2026 Annual Congress of the European Hematology Association (EHA 2026).

The loss of regenerative capacity in mammals over the course of evolution may be linked to certain environmental conditions rather than to a genetic limitation. Tissue stiffness around an amputated area, oxygen availability, or epigenetic regulation could determine this ability, according to two simultaneously published but independent studies published in Science, as reported by BioWorld yesterday.