想多了，這種瘤（不是癌）惡性度不高，得幾年時間才能長到現在這個尺寸。好好讀點書，別胡思亂想

Small GISTs may cause no symptoms, and they may grow so slowly that they have no serious effects. People with larger GISTs usually seek medical attention when they vomit blood or pass blood in their stool due to rapid bleeding from the tumor.

https://www.mayoclinic.org/diseases-conditions/gastrointestinal-stromal-tumors/cdc-20387715