Immune Reconstitution
Cell Medica’s first application involves protecting immunosuppressed patients at high risk of infection from cytomegalovirus (CMV) following allogeneic haematopoietic stem cell (bone marrow) transplant. These are typically leukaemia patients not responding to drug therapies.
These patients undergo high dose chemotherapy and whole body irradiation to kill the cancerous leukaemia cells, but this procedure destroys the patient’s natural bone marrow function which is necessary for generating red blood cells and white blood cells (immune cells).
Following the bone marrow transplant the new stem cells can take 6-9 months to fully re-populate the patient’s new immune system. During this time the patient can be very susceptible to many pathogens that an immune competent person would usually be able to control. One virus which is a particular problem is called cytomegalovirus (see Science)
CMV-specific T cells can be purified from a blood sample of the bone marrow donor and given to the patient. This strategy specifically reconstitutes the patient’s immunity to CMV and several academic research studies have provided initial indications that this technique is both safe and effective.