CSF3 and colitis: The reported AEs were moderate pneumonia (treated with infusional antibiotic therapy), moderate local inflammation in the irradiated region (treated with dexamethasone orally), pancytopenia after chemotherapy requiring blood transfusion and granulocyte colony stimulating factor (G‐CSF), serious hemorrhage of a tumor before start of radiation treatment (requiring surgical hemostasis), moderate colitis after immunotherapy (treated with prednisolone), and repeated cardiac decompensations caused by known heart failure with delay of radiation treatment.