PD-1

Formalin-fixed, paraffin embedded tissue block or cell block, or 1 unstained charged slide for each test requested plus 3-4 additional unstained slides cut at 4 microns. Adequate space on each slide for control tissue is required.

This is a send out test.

Identifies: Programmed cell death protein 1 (PD-1; CD279), a cell surface protein in the immunoglobulin superfamily, expressed in angioimmunoblastic T cell lymphomas and follicular T-cell lymphomas and is helpful in distinguishing these lymphomas from reactive lymphoid processes such as Cat-scratch, Kikuchi’s, and Castleman disease and reactive follicular hyperplasia.