Figure 1. (A) Chest radiograph obtained at the first visit to our department revealed a mass extending into the left upper and middle lung field. (B) Upon administration of tegafur/gimeracil/oteracil (S-1) as fourth-line chemotherapy, the mass appeared reduced in size on the chest radiograph, compared with its appearance before chemotherapy. (C) At the time of the appearance of purpura, the tumor was once again enlarged despite treatment with 7 courses of S-1.