T-cell lymphoma incidence/prevalence measurement percentage of study population developing T-cell lymphomas during a period of time 2013-11-18T18:50:58Z CMO:0001911 JSmith T-cell lymphoma incidence The number of new cases of T-cell lymphoma appearing in a study population during a certain period 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. VT:0010900 clinical_measurement_ontology