malignant tumor of digestive tract

例句：

1. 1. The patient was diagnosed with a malignant tumor in the liver.
   患者被诊断出肝脏有恶性肿瘤。
2. 2.The treatment for this type of cancer is aggressive surgery followed by radiation therapy.
   这种癌症的治疗方法是积极的手术和放疗。
3. 3. Malignant tumors can spread quickly and cause significant health problems.
   恶性肿瘤可以迅速扩散并导致严重的健康问题。