Medical Oncologist
CION Cancer Clinics
Why a stent usually comes before any bile duct cancer treatment | CION Cancer Clinics
A stent comes first because a blocked bile duct poisons the liver, and most cancer treatment is not safe until the liver recovers. Draining the bile clears the jaundice, eases the itching and lowers the risk of infection. This page explains why the stent is the first step of care, the route your team might choose, and when going straight to surgery is preferred. At CION Cancer Clinics in Hyderabad, our oncologists explain liver cancer in plain words and plan care around you and your family.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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On this page
- Why do doctors put in a stent before treating bile duct cancer?
- What does draining the bile make possible?
- What happens between finding the blockage and starting treatment?
- Is a stent from inside different from a drain through the skin?
- What do families often believe about the stent?
- Who does a stent first not suit, and what can this page not tell you?
- Common questions about stenting before treatment
The short answer
Why do doctors put in a stent before treating bile duct cancer?
Because the blocked bile is poisoning the liver, and most cancer treatment is not safe until the liver is working again. A stent opens a path past the tumour so bile can drain into the gut. The yellow colour fades, the itching eases, the risk of infection drops, and the body becomes strong enough for chemotherapy or, in some cases, surgery.
What the blockage does
Bile is made in the liver and flows down the bile duct into the gut. When a tumour squeezes the duct shut, bile backs up into the liver and the blood. Bilirubin rises, and the skin and eyes turn yellow. Urine goes dark, stools go pale, and the skin can itch badly. Trapped bile also becomes infected easily.
Why families find this hard
Many families want the cancer treated now and see the stent as a delay. It is not. A stent is often the first piece of cancer care, because it makes everything after it possible. The tumour is not ignored while the liver recovers. The team uses that time to finish scans, confirm the diagnosis and plan the treatment.
A stent drains the bile. It does not treat the tumour itself.Four reasons
What does draining the bile make possible?
The stent is not one reason. It is several, and which one matters most depends on the plan.
Chemotherapy becomes safe
Several chemotherapy medicines are cleared through the liver and the bile. With a high bilirubin, the body cannot clear them properly, and side effects become dangerous. Most teams wait for the bilirubin to fall before starting.
Infection is prevented or treated
Bile that cannot drain becomes a breeding ground for bacteria. This infection, called cholangitis, causes fever, shivering and pain, and it can spread to the blood. Drainage is the treatment.
The patient feels better
As bile flows again, appetite often returns, itching settles and sleep improves. Feeling stronger matters in itself and for every decision that follows.
Often improves
- Itching
- Appetite and digestion
- Energy and sleep
Surgery can be planned, sometimes
For some people whose tumour may be removable, especially near the liver, the surgeon wants the liver that will remain to be drained first. This is decided case by case, not for everyone.
Not sure whether this applies to you?
Ask an oncologistIn order
What happens between finding the blockage and starting treatment?
The map comes first
An MRCP or CT shows where the narrowing is and how far it reaches. Read MRCP, ERCP and cholangioscopy for what each test does.
The team chooses the route
For most blockages lower down, a stent goes in through ERCP from below. For blockages high at the liver, a drain through the skin may work better. Some people need both.
Samples are taken if possible
Brushings or a biopsy are often taken during the same procedure, so the diagnosis can be confirmed while the bile drains.
The bilirubin is checked
Blood tests are repeated to see the bilirubin falling. Once it is low enough and the patient is well, the plan made at the tumour board can begin.
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When this cannot wait
Jaundice with fever, shivering or confusion means the trapped bile may be infected. This applies before a stent and after one, because stents can block. Go to hospital today. Tell the doctors there is a bile duct blockage or a stent. Read blocked stents and fever for the signs to watch.
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Side by side
Is a stent from inside different from a drain through the skin?
Stent by ERCP
Drain through the skin (PTBD)
Placed with a scope passed through the mouth
Placed with a needle through the skin into the liver
Nothing outside the body afterwards
Often a tube and a bag outside the body, at least at first
Usually first choice for blockages lower down
Often better for complex blockages high at the liver
Can block, and then needs changing
Can slip or leak, and needs daily care at home
Commonly believed
What do families often believe about the stent?
"The stent means the doctors have given up."
A stent is used for people heading towards surgery and for people whose tumour cannot be removed. It tells you the bile needs draining. It tells you nothing about the overall plan.
"Once the jaundice clears, the cancer has gone."
Clearing jaundice shows the bile is flowing past the tumour. The tumour is still there and still needs treatment. This is the moment to start the plan, not to stop.
"A metal stent is always better than a plastic one."
Each has a place. The choice depends on whether surgery is possible, how long the stent needs to last and where the blockage sits. Read plastic or metal stent for how this is decided.
Being straight with you
Who does a stent first not suit, and what can this page not tell you?
Not everyone needs a stent before treatment. When the tumour sits low, near the pancreas, and the operation can happen soon, some surgeons prefer to go straight to surgery without stenting, because a stent can bring infection. If the patient has fever, severe itching, or a delay before surgery, drainage usually comes first. The surgical team makes that call.
When the cause is the liver itself
If the jaundice comes from a liver that is failing, from cirrhosis or a tumour spread through the liver, a stent does not help, because there is no single blockage to open. Read blockage jaundice versus liver-failure jaundice.
What only your team can answer
This page cannot tell you whether your tumour is removable, which route suits your blockage, or how quickly your bilirubin will fall. CION's oncologists and tumour board review the scans and plan the treatment. ERCP stenting and drains through the skin are arranged through accredited partner hospitals and specialists.
Questions we are asked
Common questions about stenting before treatment
Can chemotherapy start before the stent is placed?
Usually not while the bilirubin is high. Many chemotherapy medicines need a working liver to be cleared safely, and a blocked duct also raises the risk of infection once immunity drops. Your oncologist decides when the blood tests are good enough to start.
How long does it take for the jaundice to clear?
It varies. The itching often eases first, and the eyes take longer to lose their yellow colour. Bilirubin is checked with repeat blood tests. If it is not falling as expected, the team will look for a stent that is not draining well or a part of the liver still blocked.
Is the tumour growing while we wait?
Bile duct tumours usually grow slowly enough that a short wait to clear the jaundice is the safer choice. Starting treatment on a blocked, infected liver carries more danger than the wait. The team uses this time to complete scans and confirm the diagnosis.
Will the stent stay in forever?
Some do, some are changed. Plastic stents tend to block sooner and are replaced when needed. Metal stents last longer but are harder to remove. If you have surgery, the stent is usually taken out during the operation.
What if ERCP cannot place the stent?
The usual next route is a drain through the skin into the liver, placed by an interventional radiologist. It can later be turned into an internal stent in many cases. Read percutaneous biliary drainage for what to expect.
Does the stent affect what we eat?
Once bile flows, the gut digests fat better, and appetite often returns. There is no need to cut protein or follow a special diet unless your doctor says so. Small, regular meals help while the body recovers.
Which signs mean the stent has blocked?
The return of yellow eyes, dark urine, pale stools or itching, especially with fever or shivering. With fever, go to hospital today and say there is a bile duct stent. Without fever, call your team the same day so blood tests can be arranged.
Can CION help us decide the next step?
Yes. A CION oncologist can review the scans, blood results and procedure notes, and the tumour board can plan treatment once the bile is draining. Bring every report you have. One helpline serves every CION centre.
Your Specialists
Meet CION's liver cancer specialists. Bring your scan reports and liver blood tests.
Our medical and surgical oncologists plan liver cancer care together, weighing the tumour and how well your liver works before choosing surgery, a liver-directed procedure or medicines.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- American Cancer Society — Palliative Therapy for Bile Duct Cancer
- National Cancer Institute — Bile Duct Cancer Treatment
- Cancer Research UK — Treatment for bile duct cancer
- NHS — Jaundice
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
Plastic stent or metal stent: what decidesThe next question once a stent is plannedBlocked stents, fever and when to come back urgentlyThe warning signs every family should knowPercutaneous biliary drainage and the bag you go home withIf the stent cannot go in from belowBiliary stent vs surgical bypassWhen an operation is used to relieve the blockage instead
Talk to us
Told a stent is needed before treatment can begin?
Share the scans and blood results you have, and a CION oncologist can explain where the stent fits in the plan and what follows. One helpline serves every CION centre.