T-cell lymphoma incidence/prevalence measurement percentage of study population displaying T-cell lymphomas at a point in time 2013-11-18T18:50:55Z CMO:0001910 JSmith T-cell lymphoma prevalence The number of individuals in a study population which display, i.e., are manifesting symptoms of or have been diagnosed with, T-cell lymphomas at a certain point in time compared to the total number of individuals in the study population, expressed as a percentage. T-cell lymphoma refers to a heterogeneous group of usually malignant lymphoid neoplasms that occur as circumscribed solid tumors and that are composed of T lymphocytes. T lymphocytes are white blood cells that complete maturation in the thymus and that have various roles in the immune system, including the identification of specific foreign antigens in the body, the mediation of cellular immune responses, and the activation and deactivation of other immune cells. clinical_measurement_ontology