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The completeness of cytoreduction (CC) score, explained | CION Cancer Clinics
The CC score, short for completeness of cytoreduction, records how much visible cancer was left behind at the end of an operation to clear the lining of the abdomen. CC-0 means none could be seen, CC-1 means only tiny deposits remained, and CC-2 and CC-3 mean larger disease was left. The surgeon writes it by eye before closing. This page explains each grade, why it matters for HIPEC, and what the family should ask. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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On this page
- What does the CC score on an operation note mean?
- What do CC-0, CC-1, CC-2 and CC-3 each mean?
- Why is the score only known at the end of the operation?
- What makes a complete clearance more or less likely?
- How do the PCI and the CC score differ?
- What families often assume about the CC score, and what is true
- When and how will the family learn the score?
- Common questions about the CC score
The short answer
What does the CC score on an operation note mean?
The CC score, short for completeness of cytoreduction, records how much visible cancer was left behind at the end of an operation to clear the lining of the abdomen. CC-0 means the surgeon could see none. CC-1 means only tiny deposits remained. CC-2 and CC-3 mean larger disease was left. It is written by the surgeon, by eye, before the wound is closed.
Why it is the number surgeons care about most
HIPEC, the heated chemotherapy washed through the abdomen after the clearance, only soaks into a very thin surface layer. It can deal with deposits too small to see and, at most, the tiniest visible ones. It cannot reach into a lump. So the benefit of the whole operation depends on how close the surgeon got to CC-0, and that is what the score records.
What "complete" means in practice
Most teams count CC-0 and CC-1 together as a complete cytoreduction, because the residual deposits at CC-1 are small enough for the heated wash to reach. CC-2 and CC-3 are called incomplete. It is usually the first thing the surgeon tells the family afterwards.
This page explains the score. It does not, and cannot, turn your score into a forecast. What happens next depends on the cancer type, the pathology and the follow-up plan.The scale
What do CC-0, CC-1, CC-2 and CC-3 each mean?
- CC-0
- No visible cancer remains anywhere in the abdomen after the clearance. This is the aim of the operation.
- CC-1
- Only very small deposits remain, each smaller than about a grain of rice. These are within reach of the heated wash, so most teams still count this as complete.
- CC-2
- Deposits remain that are bigger than a grain of rice but smaller than roughly a large coin. The wash cannot reach into them, and the operation is recorded as incomplete.
- CC-3
- Deposits larger than that remain, or disease that could not be removed at all, often on the small bowel. Also incomplete.
- Cytoreduction
- The surgical clearance itself: removing every visible deposit and the lining it sits on. The CC score grades how well that went.
- R0, R1, R2
- A different scale used for most other cancer operations, based on the microscope rather than the surgeon's eye. Peritoneal surgeons use CC instead.
Not sure whether this applies to you?
Ask an oncologistHow it is decided
Why is the score only known at the end of the operation?
Because it describes what was achieved, not what was planned. Before the operation, the team estimates from scans and a keyhole look how likely a complete clearance is. Only once every surface has been stripped and every deposit dealt with can the surgeon look around and say what remains.
What can stop the surgeon reaching CC-0
Most often, disease on the small bowel. The lining can be stripped from most surfaces, but there is a limit to how much bowel can be removed and still allow normal eating. Disease wrapped around major blood vessels, or deep in the root of the bowel's blood supply, is another common reason.
The judgement is the surgeon's
The score is made by eye, at the end of many hours of work. It is not a laboratory measurement. The operation note should say the score and where any remaining disease sits. Ask for that note; it is yours.
What happens if the score is CC-2 or CC-3
The team will usually still give the heated wash if it was planned, but the discussion afterwards changes. Chemotherapy through a vein, a later second operation, or symptom control become the focus.
An incomplete score is not a failed operation. Fluid and bulk are often relieved even when disease remains.What shapes the score
What makes a complete clearance more or less likely?
These are the things the team weighs beforehand when they say how likely CC-0 is in your case.
How much disease there is
The Peritoneal Cancer Index, scored before clearance begins, is the strongest predictor. A low PCI usually means CC-0 is achievable; a very high one makes it harder.
Where it sits
Deposits on the lining of the abdominal wall, the diaphragm or the pelvis can be stripped. Deposits scattered across the small bowel or its blood supply often cannot, whatever the total score.
The cancer type
Jelly-like disease such as pseudomyxoma peels away from surfaces and can be cleared even when widespread. Cancers that invade into tissue, such as stomach cancer, are harder to remove completely.
Previous surgery
Scar tissue from earlier operations can hide deposits and make stripping slower and riskier. Tell the team about every abdominal operation you have ever had, including ones from decades ago.
Worth mentioning
- Appendix or gallbladder removal
- Caesarean sections and hernia repairs
- Any earlier cancer surgery
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Side by side
How do the PCI and the CC score differ?
Peritoneal Cancer Index (PCI)
Completeness of cytoreduction (CC)
Measured before the clearance begins
Recorded after the clearance is finished
Says how much disease there was, region by region
Says how much visible disease was left behind
Runs from nought to thirty-nine
Runs from CC-0 to CC-3
Helps decide whether to operate at all
Helps decide what happens after the operation
Commonly believed
What families often assume about the CC score, and what is true
"CC-0 means the cancer is gone."
It means nothing could be seen. Cells too small to see may remain, which is what the heated wash is for, and why follow-up continues for years. It is the outcome everyone hopes for, and it is still the start of follow-up, not the end of it.
"CC-1 means the surgeon did not finish the job."
CC-1 is counted as a complete clearance by most teams, because the tiny deposits left are within reach of the heated wash. It usually reflects disease on a surface that could not safely be stripped further, not a lack of effort.
"A CC-3 means the operation was pointless."
It means complete clearance was not possible, which the team will have warned was a risk. Bulk and fluid are often relieved, and the information gained shapes the next step. It is a disappointment, not a wasted day.
"The score can be improved by a better surgeon."
Experience does matter, which is why centre choice matters. But the score is set mostly by where the disease sits. Disease on the small bowel limits every surgeon. Ask about experience before the operation; do not second-guess the score after it.
When you will hear it
When and how will the family learn the score?
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Straight after the operation
The surgeon usually speaks to the family once the person is safely in intensive care, and the CC score is normally part of that first conversation. Ask for it if it is not mentioned.
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In the operation note
The written record of the operation lists what was removed, the PCI at the start and the CC score at the end. You are entitled to a copy. Keep it with the scans.
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When the pathology report returns
Weeks later, the tissue removed is reported by a pathologist. This adds grade and type, and can change the plan even after a CC-0, so the score and the pathology are read together.
-
At the first follow-up
The team puts the score, the pathology and your recovery together and sets out what comes next: further chemotherapy, scans only, or something else. This is the appointment to bring your questions to.
Questions we are asked
Common questions about the CC score
The note says CC-1. Should we be worried?
Most teams count CC-1 as a complete clearance, because the deposits left are tiny and within reach of the heated wash. Ask the surgeon where the remaining deposits sit and why they were left. That answer will tell you more than the number.
Can the CC score be measured by a scan afterwards?
No. It is a judgement made by the surgeon looking directly into the abdomen at the end of the operation. Scans later in follow-up look for disease returning or growing, which is a different question. The score itself is written once and does not change.
Does CC-0 mean no more treatment is needed?
Not always. For some cancers, chemotherapy through a vein is still advised after a complete clearance, depending on the type and the pathology. For others, scans and blood markers are the plan. Your team decides this at the first follow-up, once the pathology is back.
Why was the heated wash given if the score was CC-2?
Teams differ. Some give it whenever it was planned, on the basis that it treats the cleared surfaces even if a deposit remains elsewhere. Others hold it back when clearance is incomplete. Ask your surgeon what their reasoning was; both approaches have a rationale.
Is CC the same as clear margins?
Similar idea, different measure. Margins are checked under a microscope on the removed tissue and apply to a single lump. The CC score is made by eye across the whole abdomen. Peritoneal surgery involves so many surfaces that the margin system does not fit, which is why CC was created.
Can a second operation improve the score?
Sometimes, if the disease left behind is in a place that could be cleared later, or after chemotherapy has shrunk it. For slow-growing disease such as pseudomyxoma, repeat operations are more common. Ask whether this is a realistic path for your cancer, and what would have to change first.
Who decides the score if two surgeons operate?
The lead surgeon, and it is recorded in the operation note in their name. Peritoneal operations often involve two surgeons working for many hours, and they will have looked around the abdomen together before closing. Agreement between them is usual.
What should I ask at the first follow-up?
Four things: what the CC score was and where any disease remains; what the pathology showed; whether further treatment is advised and why; and what the follow-up schedule will be. Write the answers down. Our helpline can help you prepare the list before you go.
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Sources
- NICE — Cytoreduction surgery followed by hyperthermic intraoperative peritoneal chemotherapy for peritoneal carcinomatosis (IPG331)
- National Cancer Institute — Definition of cytoreductive surgery
- National Cancer Institute — Definition of HIPEC
- Cancer Research UK — Pseudomyxoma peritonei (PMP)
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
The Peritoneal Cancer Index (PCI) ExplainedThe score measured before the clearance beginsCytoreductive Surgery Plus HIPEC: The Two HalvesWhy the clearance and the wash depend on each otherOrgans That May Be Removed During CytoreductionWhat the surgeon may have to take to reach CC-0Follow-Up After HIPECWhat the years after the operation look likeThe Pathology Report After SurgeryThe report that is read alongside the score
Talk to us
An operation note you are trying to understand?
Send us the operation note and pathology report or call the helpline. A surgical oncologist will explain what the CC score and the findings mean and which questions to take to the first follow-up. One helpline serves every CION centre.