CD274 and neoplasm: An example of such a tracer is the 18F-labeled adnectin [18F]BMS98619235, but also the development of single-domain antibody-based tracers hold much promise.43 44 The presence of an unknown number of viable tumor cells and immune cells, with or without PD-L1 expression adds an extra layer of complexity and additional methods to assess these cells separately are needed.