Pembrolizumab associated hemophagocytic lymphohistiocytosis

Hemophagocytic lymphohistiocytosis (HLH) is a potentially fatal disease, resulting from uninhibited T-cells causing a cytokine storm, and histiocytes engulfing other blood or marrow cells. The resulting syndrome, if left untreated, can cause a rapid demise of a patient. We describe a patient who was on immunotherapy with pembrolizumab and developed HLH.

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