Pancreatic Cancer Stages and Why They Matter

Pancreatic cancer is staged in two ways. Each one serves a different purpose. The AJCC system assigns a stage from 0 to IV. It uses tumor size, lymph node involvement, and distant spread. The current version is the 8th edition, effective since 2018. Alongside this, doctors also describe pancreatic cancer using a resectability category. The categories are resectable, borderline resectable, locally advanced, and metastatic. This second system exists for a reason. For pancreatic cancer, whether surgery can remove the tumor matters as much as the formal stage number. Sometimes it matters more.

Stage 0 means abnormal cells are confined to the top layer of cells lining the pancreatic duct. They have not invaded deeper tissue. They have not spread anywhere. This includes precancerous changes found before true invasive cancer has developed.

Stage I means the tumor is still confined to the pancreas. It has not spread to lymph nodes or distant organs. Doctors split this into two groups. IA means the tumor is 2 centimeters or smaller. IB means it is between 2 and 4 centimeters. At this stage, the tumor is usually resectable. That means surgery can remove it entirely.

Stage II also has two parts. IIA means a tumor larger than 4 centimeters. It is still confined to the pancreas, with no node involvement. IIB means a tumor of any size that has spread to nearby lymph nodes. Up to three nodes can be involved. Many stage II cancers are still resectable. Some need chemotherapy first, to improve the chances of a clean surgical result.

Stage III has two possible meanings. The cancer may have spread to four or more lymph nodes. Or it may have grown into major blood vessels near the pancreas. Either way, it has not spread to distant organs. This is where the resectability category becomes especially important. Some stage III tumors are borderline resectable. They touch or partly surround a blood vessel. They might become removable after chemotherapy shrinks them first. Others are unresectable, or locally advanced. Surgery is not a safe option for these, even after other treatment. The blood vessel involvement is too extensive.

Stage IV means the cancer has spread to distant sites, most often the liver, the lining of the abdomen, the lungs, or bone. At this stage, cancer is considered metastatic. It is not treated with surgery aimed at cure. Treatment instead focuses on systemic drugs and controlling symptoms.

Two people can carry the same AJCC stage number. They can still face very different treatment paths. The difference often comes down to where the tumor sits relative to major blood vessels. A resectable tumor offers the clearest path toward potential cure. A borderline resectable tumor may become operable after chemotherapy shrinks it. This is why chemotherapy before surgery has become a common strategy. It applies even to tumors that might technically be removable right away. An unresectable or metastatic tumor shifts the goal. Treatment focuses on controlling the cancer and preserving quality of life, using chemotherapy and sometimes radiation.

• What is my AJCC stage, and separately, is my tumor considered resectable, borderline resectable, or unresectable?
• Would chemotherapy before surgery improve my chances of a successful operation?
• If surgery is not possible now, could it become possible after other treatment?
• What does my specific stage and resectability status mean for my treatment plan and timeline?

• American Cancer Society — Pancreatic Cancer Stages