Nimotuzumab Combined With Chemoradiotherapy in the Treatment of Unresectable Locally Advanced or Oligometastatic Pancreatic Cancer

1\. Radiotherapy: Conventional fractionated radiotherapy or SBRT can be selected. 1. Conventional Fractionated Radiotherapy: Pancreatic tumor + 5mm PTV 50-60Gy/25 fractions/5W; Pancreatic tumor GTV 60-70Gy/25 fractions/5W; If there are suspected metastatic lymph node regions, prophylactic irradiation of lymph node drainage areas should be performed. 2. Stereotactic Body Radiotherapy (SBRT): Pancreatic tumor + 5mm PTV 30Gy/5 fractions/5 days; Pancreatic tumor GTV 40Gy/5 fractions/5 days. 2\. Nintuzumab: Nintuzumab 400mg, intravenous infusion, on day 1, administered once a week (QW). Mix400 mg of nintuzumab injection with 250ml of sodium chloride solution, and the infusion time should be more than 60 minutes. Administer concurrently during radiotherapy and discontinue use after radiotherapy. 3\. Chemotherapy (either tegafur or capecitabine, choose one): 1. Tegafur-gimeracil-oteracil (S-1): 80-120mg per day, taken twice a day, from day 1 to day 14, and from day 21 onwards. One treatment cycle consists of 21 days. 2. Capecitabine: 2000mg per square meter per day, taken twice a day, from day 1 to day 14, and from day 21 onwards. One treatment cycle consists of 21 days. Continue the treatment until the disease progresses or an intolerable toxic reaction occurs.