811 Allelic variation in Human Leukocyte Antigen class II genes is associated with pneumonitis risk in cancer patients treated with immune checkpoint inhibitors oleh Christine Spencer, Shahneen Sandhu, Ira Mellman, Zia Khan, Julie Hunkapiller, Samantha Bucktrout, Ashis Saha, Jonathan Carroll, Claudia Yanez Arellano, Nicholas Bayless, Leonardo Nissola, Roslyn Wallace, Rajat Mohindra, G. Scott Chandler, Christian Hammer