Inclusion Criteria:  Histologically diagnosed with adenocarcinoma of the pancreas or clinically diagnosed with imaging examinations or tumor markers 20 years or older Performance status 0-2 based on Eastern Cooperative Oncology Group (ECOG) Patients with surgically resectable or borderline resectable and advanced pancreatic cancer that can be resected after neoadjuvant chemotherapy Patients who voluntarily decided to participate in this clinical study and signed a written informed consent  Exclusion Criteria:  History of previous abdominal irradiation. When the treatment area is not included in the appropriate radiation field according to the judgment of the radiation oncologist or Durgeon Distant metastasis Other systemic conditions that, under the judgment of the attending physician, would be difficult to undergo surgery or radiiotherapy