HIPEC Chemotherapy: A Guide to Procedure, Uses and Recovery

The process is HIPEC chemotherapy, a specialised treatment approach that's transforming outcomes for specific advanced cancers, particularly those affecting the abdominal cavity.

If you or a loved one has been recommended HIPEC, this information will help you understand what lies ahead.

What is HIPEC chemotherapy?

HIPEC stands for Hyperthermic Intraperitoneal Chemotherapy. Breaking this down:

• •Hyperthermic:
  Heated (typically 41-43°C or 106-109°F)
• •Intraperitoneal:
  Delivered inside the peritoneal cavity (abdominal space)
• •Chemotherapy:
  Cancer-killing drugs

Cancers commonly treated with HIPEC:

• •Peritoneal mesothelioma: Cancer of the peritoneal lining, often asbestos-related
• •Appendiceal cancer: Including pseudomyxoma peritonei
• •Colorectal cancer with peritoneal metastases
• •Ovarian cancer (primary or recurrent with peritoneal spread)
• •Gastric (stomach) cancer with peritoneal carcinomatosis
• •Primary peritoneal cancer

HIPEC chemotherapy has become the standard of care at specialised centres for select patients with peritoneal surface malignancies.

How HIPEC chemotherapy works

HIPEC intraperitoneal chemotherapy involves a complex, multi-hour surgical procedure. Understanding the steps helps you know what to expect.

Step-by-step procedure:

Step 1: Cytoreductive Surgery (CRS)

Surgeons begin with extensive surgery to remove all visible cancer. This is called cytoreduction or "debulking." The goal is complete macroscopic removal - eliminating all tumours visible to the naked eye.

This may involve removing affected portions of the peritoneum, portions of organs (spleen, gallbladder, parts of intestine), or other involved structures. Surgery typically lasts 6-14 hours, depending on disease extent.

Step 2: HIPEC Perfusion

Once visible tumours are removed, HIPEC chemotherapy treatment begins while you remain under anaesthesia:

• •The abdomen is temporarily closed
• •Catheters are placed into the abdominal cavity
• •HIPEC chemotherapy drugs mixed in sa terile solution are circulated through the abdomen
• •The solution is heated to 41-43°C (106-109°F)
• •The heated chemotherapy bathes all internal surfaces for 60-90 minutes
• •Continuous circulation ensures even drug distribution
• •After treatment time, the solution is drained and removed

Step 3: Final closure

Surgeons perform a final inspection, close the abdomen, and you're transferred to intensive care for initial recovery monitoring.

What makes HIPEC chemotherapy effective

What is HIPEC chemotherapy doing that traditional chemotherapy can't? Several mechanisms enhance effectiveness:

• •Direct delivery:
  Chemotherapy is delivered directly to cancer cells in the peritoneal cavity, achieving drug concentrations 20-100 times higher than possible with IV chemotherapy.
• •Heat effect:
  Hyperthermia (heat) directly damages cancer cells, making them more vulnerable to chemotherapy. Studies show that heat increases drug penetration into tumour tissue and enhances cancer cell death.
• •Immediate timing:
  Treatment occurs immediately after surgery, while cancer cell burden is minimal, only microscopic disease remains. This is at what stage of cancer is chemotherapy used most effectively in HIPEC protocols.
• •Reduced systemic exposure:
  Because drugs remain primarily in the abdomen, systemic side effects are reduced compared to IV chemotherapy delivering equivalent doses.

Commonly used HIPEC chemotherapy drugs

HIPEC chemotherapy drugs selection depends on cancer type. According to current clinical guidelines:

• •Mitomycin C:
  Most commonly used, especially for colorectal cancer, appendiceal cancer, and peritoneal mesothelioma. Highly effective with a manageable toxicity profile.
• •Cisplatin:
  Often used for ovarian cancer and gastric cancer with peritoneal spread. Sometimes combined with doxorubicin.
• •Oxaliplatin:
  Increasingly used for colorectal cancer peritoneal metastases.
• •Doxorubicin:
  Sometimes used in combination protocols, particularly for ovarian cancer.
• •Combination therapy:
  Combination therapy: Many centers use two-drug combinations to enhance effectiveness. Your oncology team selects chemotherapy drugs based on your specific cancer type and characteristics.

Who Needs HIPEC Chemotherapy?

Not everyone with abdominal cancer is a candidate. HIPEC intraperitoneal chemotherapy requires careful patient selection.

Ideal candidates include those with:

• •Limited peritoneal disease:
  Cancer confined to the peritoneum without extensive distant metastases (lungs, liver, bones)
• •Good performance status:
  Ability to tolerate major surgery and recovery
• •Complete or near-complete cytoreduction potential:
  Surgeons must be able to remove all or nearly all visible tumour
• •Specific cancer types:
  Those known to respond well to HIPEC

You may NOT be a candidate if you have:

1. 1. Extensive disease beyond the peritoneum
2. 2. Poor overall health or organ function
3. 3. Prior extensive abdominal surgeries creating difficult anatomy
4. 4. Cancers that don't respond well to HIPEC protocols

Benefits of Hyperthermic Intraperitoneal Chemotherapy *(HIPEC)

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Why consider such an intensive treatment? For appropriate candidates, benefits can be significant.

• •Improved survival:
  Research consistently shows survival benefits over systemic chemotherapy alone for peritoneal cancers. A 2024 meta-analysis in JAMA Oncology found median survival improvements of 12-24 months in select patient populations.
• •Potential for cure:
  In some cases (particularly appendiceal cancer and peritoneal mesothelioma), HIPEC chemotherapy combined with complete cytoreduction offers potential long-term disease-free survival or cure.
• •Reduced recurrence:
  By eliminating microscopic disease, HIPEC reduces peritoneal recurrence risk compared to surgery alone.
• •Quality of life:
  Quality of life: Controlling peritoneal disease prevents complications like bowel obstruction and malignant ascites that severely impact quality of life.
• •Targeted treatment:
  Higher local drug concentrations with lower systemic toxicity compared to achieving similar exposure via IV chemotherapy.

HIPEC chemotherapy side effects & risks

HIPEC chemotherapy side effects and surgical risks must be carefully weighed against potential benefits.

Short-term side effects

Immediate post-procedure effects include:

• •Pain:
  Significant abdominal pain requiring strong pain management for days to weeks
• •Fatigue:
  Profound exhaustion lasting weeks to months
• •Nausea and vomiting:
  Common in first week, manageable with medications
• •Loss of appetite:
  May persist for several weeks
• •Bowel changes:
  Diarrhoea or constipation as digestive system recovers

Long-term risks

Potential lasting effects include:

• •Bone marrow suppression:
  Low blood counts (white cells, red cells, platelets) may persist for weeks
• •Kidney stress:
  Cisplatin and mitomycin can affect kidney function, requiring careful monitoring
• •Peripheral neuropathy:
  Numbness or tingling in hands/feet, particularly with cisplatin or oxaliplatin
• •Intestinal adhesions:
  Scar tissue causing future bowel problems

Surgery-related complications

Major surgery carries specific risks:

• •Infection:
  Abdominal or wound infections (5-10% of cases)
• •Bleeding:
  Requiring transfusion or reoperation (rare)
• •Anastomotic leak:
  If intestinal connections are made (2-5% risk)
• •Prolonged ileus:
  Delayed return of bowel function
• •Fistula formation:
  Abnormal connections between organs (rare but serious)

How to manage side effects safely

• •Pain management:
  Work closely with your pain team. Multimodal approaches combining medications, nerve blocks, and non-pharmaceutical methods work best.
• •Nutrition support:
  You may need IV nutrition initially, transitioning to liquid then solid foods gradually. A dietitian specialising in surgical recovery helps optimise nutrition.
• •Infection prevention:
  Careful wound care, antibiotics as prescribed, monitoring for fever or increasing pain.
• •Activity:
  Early mobilisation (walking) as soon as medically safe prevents complications and speeds recovery.
• •Follow-up:
  Regular blood work monitoring of organ function and blood counts allows early intervention if problems develop.

Preparing for HIPEC chemotherapy treatment

Proper preparation improves outcomes and reduces complications.

Medical evaluation & tests needed

Before HIPEC chemotherapy treatment, expect:

• •CT or MRI scans:
  Detailed imaging to map disease extent
• •PET scan:
  May be used to identify distant metastases
• •Blood tests:
  Complete evaluation of organ function, blood counts, tumour markers
• •Cardiac evaluation:
  EKG, possibly echocardiogram
• •Pulmonary function tests:
  If indicated
• •Nutritional assessment:
  Evaluation and optimisation before surgery

Medical evaluation & tests needed

Before HIPEC chemotherapy treatment, expect:

• •CT or MRI scans:
  Detailed imaging to map disease extent
• •PET scan:
  May be used to identify distant metastases
• •Blood tests:
  Complete evaluation of organ function, blood counts, tumour markers
• •Cardiac evaluation:
  EKG, possibly echocardiogram
• •Pulmonary function tests:
  If indicated
• •Nutritional assessment:
  Evaluation and optimisation before surgery

Hospital stay planning

Plan for extended hospitalisation:

• •ICU stay:
  1-3 days immediately post-procedure for intensive monitoring
• •Hospital stay:
  Typically 10-21 days total depending on recovery course
• •Drains and tubes:
  Expect nasogastric tube, urinary catheter, surgical drains initially
• •Gradual diet advancement:
  From nothing by mouth to liquids to solids over days to weeks

Pre-surgery diet & lifestyle guidelines

• •Nutrition:
  Optimise nutritional status. High-protein diet in weeks before surgery. Consider nutritional supplements if recommended.
• •Exercise:
  Gentle conditioning (walking, light activities) builds stamina for recovery.
• •Smoking cessation:
  Absolutely critical. Smoking dramatically increases complication risk.
• •Medications:
  Follow specific instructions about which medications to stop/continue. Certain blood thinners, supplements must be discontinued.
• •Mental preparation:
  Consider counselling or support groups. This is major surgery with significant recovery demands.

Get expert guidance for HIPEC surgery

For patients with peritoneal surface malignancies who are good candidates, HIPEC chemotherapy has transformed an otherwise difficult-to-treat condition into one where meaningful long-term survival is achievable.