endometrial stromal sarcoma

例句：

1. 1.This type of cancer is rare but can be deadly if not treated early.
   这种癌症罕见，但如果不及时治疗可能会致命。
2. 2.The patient had to undergo surgery to remove the tumor.
   患者不得不接受手术以切除肿瘤。
3. 3. Researchers are trying to find a cure for this rare form of cancer.
   研究人员正在尝试找到这种罕见癌症的治愈方法。