Pancreatic cancer has five stages, numbered 0 through 4. Each stage reflects how large the tumor has grown, whether it has reached nearby lymph nodes, and whether it has spread to distant organs. Staging determines which treatments are available and gives a general picture of prognosis.
The Five Stages at a Glance
The staging system used for pancreatic cancer is maintained by the American Joint Committee on Cancer (AJCC) and is built on three factors: tumor size (T), lymph node involvement (N), and whether the cancer has metastasized to distant sites (M). Combining those three factors places the cancer into one of the five stages.
- Stage 0: Abnormal cells are found only in the lining of the pancreatic ducts. They haven’t invaded deeper tissue or spread anywhere else. This is sometimes called carcinoma in situ, and these cells may or may not progress to invasive cancer.
- Stage I: The tumor is confined to the pancreas with no lymph node involvement. Stage IA tumors are 2 centimeters or smaller, while stage IB tumors are between 2 and 4 centimeters.
- Stage II: The tumor may be larger than 4 centimeters, or cancer has reached one to three nearby lymph nodes, but it hasn’t spread to distant organs.
- Stage III: Cancer has spread to four or more nearby lymph nodes, or the tumor has grown into major blood vessels near the pancreas, or both. It still hasn’t reached distant organs.
- Stage IV: Cancer has spread to distant parts of the body, most commonly the liver, lungs, or lining of the abdominal cavity.
How Tumor Size Affects the Stage
The T category is based on straightforward size cutoffs. A T1 tumor is 2 centimeters or smaller (roughly the size of a grape). T2 tumors fall between 2 and 4 centimeters. T3 tumors are anything larger than 4 centimeters. A T4 tumor isn’t defined by size alone; it means the cancer has grown into nearby major arteries, which typically makes surgical removal much harder or impossible.
These size thresholds matter because they directly influence whether a surgeon can safely remove the tumor. Smaller tumors that haven’t reached blood vessels are far more likely to be candidates for surgery.
How Lymph Node Spread Is Counted
Lymph node involvement is one of the clearest dividing lines between stages. N0 means no lymph nodes contain cancer. N1 means cancer has reached one to three nearby lymph nodes. N2 means four or more lymph nodes are involved. Moving from N1 to N2 can bump a cancer from stage II to stage III, which significantly changes the treatment approach.
Clinical Categories That Guide Treatment
While the numbered staging system describes how far the cancer has spread, doctors also classify pancreatic cancer into four practical categories based on imaging. These categories determine what happens next for the patient.
Resectable means a surgeon can remove the entire tumor. To improve outcomes, you may also receive drug therapy before or after the operation. Borderline resectable means the tumor sits close to critical blood vessels, making complete removal difficult. Treatment to shrink the tumor typically comes first, with surgery attempted afterward. Locally advanced means the cancer can’t be removed surgically right now because it has grown into or around major blood vessels. Some patients in this group eventually become surgical candidates after treatment shrinks the tumor, while others do not. Metastatic (stage IV) means the cancer has spread to distant organs. The primary goal at this point is controlling the cancer, managing symptoms, and prolonging life through systemic drug therapy.
These clinical categories don’t replace the numbered stages, but they’re often more directly useful in everyday treatment decisions. Two patients with stage III cancer could face very different paths depending on exactly where the tumor sits relative to nearby arteries.
How Pancreatic Cancer Is Staged
A specialized CT scan with contrast dye is the primary tool for staging. About 93% of cancer centers use a multiphase pancreatic protocol CT as the first-line imaging study. This type of scan captures the pancreas at different moments as contrast flows through, giving doctors a detailed view of the tumor’s relationship to surrounding blood vessels.
MRI is used as an alternative when CT results are unclear or when a patient can’t receive the contrast dye needed for CT. MRI has similar accuracy for assessing how far the cancer has spread locally. If doctors suspect the cancer has reached distant organs, a CT of the chest, abdomen, and pelvis is standard. PET scans are sometimes added as a supplement but aren’t used as a replacement for high-quality CT.
Survival Rates by Stage
Survival statistics for pancreatic cancer vary dramatically depending on how far the disease has spread at diagnosis. The National Cancer Institute’s SEER database, using data from 2016 through 2022, reports the following five-year relative survival rates:
- Localized (cancer confined to the pancreas): 43.6%
- Regional (spread to nearby lymph nodes or tissues): 17.0%
- Distant (spread to distant organs): 3.4%
These numbers use a simplified three-tier system rather than the 0-through-IV stages. “Localized” roughly corresponds to stages I and some stage II cases. “Regional” captures other stage II and stage III cancers. “Distant” is stage IV. The gap between localized and distant survival underscores how much early detection matters for this cancer, though pancreatic cancer is notoriously difficult to catch early because it rarely causes symptoms until it has grown significantly.
It’s worth noting that the 43.6% localized survival rate is a meaningful improvement over figures from earlier decades, reflecting advances in surgical techniques and combination drug therapies. Still, most pancreatic cancers are diagnosed at the regional or distant stage, which is the main reason overall survival numbers for this cancer remain low.