What does allogeneic mean?
Allogeneic is a technical adjective used in medicine and immunology to describe cells, tissues, or organs that come from a genetically different individual of the same species. It arises most often in discussions of transplantation: an allogeneic stem cell or bone marrow transplant uses a donor whose genes differ from the recipient's, which means the patient's immune system may recognize the graft as foreign. This distinguishes it from autologous transplants, where tissue is taken from and returned to the same person, and from xenogeneic transfer, which crosses species lines. The word derives from Greek roots meaning 'other' and 'origin', reflecting the genetic difference between donor and host. Because organ and stem cell transplantation has become central to modern treatment of leukaemia, blood disorders, and organ failure, allogeneic has become an important term in clinical practice, research literature, and patient-facing medical communication.
adjectiveDenoting cells or tissue taken from one individual and transplanted into another genetically different individual of the same species. It is used chiefly in medicine and immunology to describe grafts or transplants between non-identical members of the same species.
- (Of cells, tissues, or organs) obtained from a genetically different individual of the same species, especially in the context of transplantation.
"The patient received an allogeneic stem cell transplant from an unrelated matched donor."
"Doctors opted for an allogeneic bone marrow transplant after chemotherapy failed to control the disease."
"Allogeneic blood transfusions remain a mainstay of major surgery despite advances in cell salvage techniques."
Every allogeneic transplant is a quiet negotiation with your immune system — the body must be taught to accept tissue from someone else as its own.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of allogeneic
Allogeneic comes from the Greek elements allo-, meaning 'other' or 'different', and -geneic, from Greek genesis, relating to origin or descent. The term was formed within twentieth-century medical science alongside related coinages such as autologous and syngeneic, as immunologists needed precise vocabulary for describing the genetic relationships between transplant donors and recipients. Its allo- root links it to other Greek-derived words such as allergy and allomorph.
Related word forms
How allogeneic is actually used
A technical term used almost exclusively in medical, immunological, and scientific contexts; it is rarely encountered in everyday conversation. It is standard in both British and American medical literature.
Easily confused with allogeneic
Autologous describes tissue transplanted from a person back into themselves, whereas allogeneic describes tissue transplanted from a genetically different individual of the same species.
Xenogeneic refers to tissue transferred between individuals of different species, while allogeneic refers to transfer within the same species.