GIST Specialist for Agoura Hills, CA
If you have just been told you have a gastrointestinal stromal tumor, this page sets out the whole pathway in order: what needs establishing, what the options are, what the operation involves, and what follows it. Joshua Ellenhorn, MD, FACS treats this tumor as a specialty.
- A complete pathway rather than a series of appointments
- Clinical Professor of Surgery, Cedars-Sinai Medical Center
- Remote review of records before you drive in
- Rarely urgent, which means there is time to do it properly
What This Tumor Is, in Plain Terms
A gastrointestinal stromal tumor grows from the interstitial cells of Cajal, pacemaker cells inside the wall of the digestive tract that coordinate the contractions moving food along. It is a sarcoma rather than a carcinoma, which means it is not the stomach or bowel cancer most people picture, and it is not treated like one.
Three features of that biology work in your favour. It grows outward from the wall rather than into the passage, which is why it often causes no symptoms and why it is frequently found incidentally. It rarely spreads to lymph nodes, so the wide clearance a conventional cancer demands is generally unnecessary and a limited resection can be curative. And nearly all carry a mutation in KIT or PDGFRA which locks a growth signal on, which is precisely what targeted tablets were designed to switch off.
That last point is why GIST occupies an unusually favourable position among sarcomas. Conventional chemotherapy and radiation work poorly here, but the targeted drugs work well, and there is an established sequence of them if resistance develops. Patients live for many years even with disease that has spread.
Risk is graded rather than binary. Every GIST carries some, set by three things: how large it is, where in the digestive tract it sits, and the mitotic index counted by the pathologist. Those three numbers determine whether you need an operation, whether you need medication, and how long you should be followed.
What Happens, in Order
Six stages. Most patients are through the first four within a few weeks, and the fourth is where the decisions actually get made.
| Stage | What happens | What you should come away with |
|---|---|---|
| 1. Confirming the diagnosis | Endoscopy, often endoscopic ultrasound, and pathology with immunohistochemistry | Certainty that this is a GIST and not a leiomyoma, schwannoma or other lookalike |
| 2. Staging | Contrast CT of the abdomen and pelvis. MRI for rectal tumors, PET selectively | Size, exact location, what it touches, and whether there is liver or peritoneal disease |
| 3. Genotyping | Mutation testing on the specimen | Which subtype you have, which determines whether targeted drugs will work and at what dose |
| 4. The decision | Risk grading from size, site and mitotic index, then a plan | Your risk category, whether surgery is recommended, which operation, and whether medication comes first |
| 5. Treatment | Surveillance, resection, or medication then resection | For gastric tumors usually a laparoscopic wedge, often one night, with lifting restricted four to six weeks |
| 6. Follow up | Imaging at defined intervals, with adjuvant medication where the grading warrants it | A written schedule with a stated endpoint, and clarity on what symptoms to report |
The order matters. Operating before genotyping, or deciding on medication before the risk category has been calculated, is how plans get made on incomplete information.
Three Paths, and What Selects Them
Which applies to you comes out of stage four above rather than from preference.
Surveillance
Small gastric tumors with a low mitotic count and reassuring imaging can be followed rather than removed. That is a considered decision, not a delay, and it spares you an operation you did not need.
Targeted Therapy
Imatinib and its successors shrink responsive tumors substantially over three to nine months, which can turn a major resection into a modest one. Also used after surgery where the risk grading warrants it, typically for three years.
Complete Resection
Removal with the capsule intact and clear margins. Laparoscopic or robotic wherever the anatomy allows. The capsule staying whole matters more than the width of the margin, which is the opposite of most cancer surgery.
The Tumor Must Come Out Whole
If there is one thing to take from this page, it is this. A GIST is contained within a capsule, and while that capsule is intact the disease is contained with it. Complete removal is then usually curative.
If the capsule is breached, cells spill into the abdominal cavity and settle on the peritoneal surfaces, and no subsequent operation reliably retrieves them. A ruptured tumor is treated as high risk regardless of how small it was, with recurrence rates approaching those of metastatic disease and medication frequently continued indefinitely rather than for three years.
Some rupture happens spontaneously before anyone operates and is nobody fault. A meaningful share occurs during surgery, through grasping the tumor rather than the tissue around it, pulling a large friable mass through a small incision, or removing it in pieces because it will not fit. Each of those is avoidable, and each is a matter of technique and restraint rather than equipment.
Which makes it the single most useful question to ask before consenting to an operation: will the tumor come out whole, in a retrieval bag, and what happens if it turns out to be too large for the planned approach.
The Operations, on Record
Recordings of real GIST resections narrated by the surgeon who performed them. Worth watching for how the tumor is handled, which is what the section above is about.
Laparoscopic Resection of a Gastric GIST
A gastric GIST removed through small incisions with the capsule kept intact throughout.
Gastric GIST Resection: A Simplified Approach
A refined approach that shortens both operating time and recovery.
Robotic Resection of a Duodenal GIST
Duodenal GIST removed robotically with the pancreas and bile duct preserved, avoiding a far larger operation.
Send the Records First
Imaging in its original format, the full pathology report including the mitotic index, and any mutation testing. From forty minutes away, that review answers whether travelling would change your plan before you make the trip.
Certifications and Appointments
Two American Board of Surgery certifications, a Cedars-Sinai teaching appointment, and membership of the societies that publish the guidelines referenced throughout this page.
- American Board of Surgery, certified in General Surgery
- American Board of Surgery, certified in Colorectal Surgery
- California State Medical License
- Florida State Medical License
Joshua Ellenhorn, MD, FACS
Dr. Ellenhorn is a surgical oncologist and Clinical Professor of Surgery at Cedars-Sinai Medical Center, and a collaborative member of the Samuel Oschin Comprehensive Cancer Institute. He is widely regarded as one of the leading GIST surgeons in the United States.
The practice is narrow deliberately, concentrating on complex abdominal cancers and gastrointestinal stromal tumors rather than the breadth of general surgery. For a tumor making up about one percent of gastrointestinal cancers, that concentration is what allows the pathway on this page to be routine rather than assembled case by case: the genotyping ordered without prompting, the risk category calculated rather than assumed, the surveillance schedule written down with an end date.
He is certified by the American Board of Surgery in General Surgery and in Colorectal Surgery, a Fellow of the American College of Surgeons, and a member of the Society of Surgical Oncology and the American Society of Clinical Oncology. He practises with the Surgery Group of Los Angeles.
Eight Questions That Cover Everything
If you ask nothing else, ask these. Every one of them changes what happens to you.
- What is my mitotic index, and which risk category does that give?
- Was mutation testing done, and what subtype am I?
- Which operation is proposed, and how much of the organ stays?
- Will the tumor come out whole and in a retrieval bag?
- What happens if it is larger or more difficult than the scan suggests?
- Would medication before surgery make the operation smaller?
- Will I need imatinib afterwards, and for how long?
- What is my surveillance schedule, and when does it end?
What Patients Say
Reviews left by patients treated by Dr. Ellenhorn at the Surgery Group of Los Angeles.
★★★★★I was very pleased with the office staff, they were always very pleasant and helpful. I was very impressed with Dr. Ellenhorn as well. He was very friendly and addressed all my concerns regarding my surgery and aftercare and follow up.
Terry Jackson
★★★★★The staff at the Surgery Group of Los Angeles are wonderful. They are kind, very attentive, the office is clean and I did not have to wait long at all. I cannot say enough great things about Dr. Ellenhorn. He is an excellent surgeon who is highly skilled and very knowledgeable. I cannot thank him enough for all he has done for my family and I.
Erika Frank
From Agoura Hills
The 101 east to the 405 south, then the 10 east and north on La Cienega to 3rd Street. Forty to fifty minutes depending on when you travel, and the 101 through the valley is the variable part.
From that distance, sending records ahead is usually the better first step. Imaging, pathology and any mutation testing travel electronically, and stages one to four of the pathway above can largely be assessed before you commit to the journey. You then travel because there is something specific to discuss.
The office is in the medical plaza attached to Cedars-Sinai Medical Center, so imaging, pathology, consultation and the operating rooms are in one building. Surveillance imaging afterwards can generally be done closer to home and reviewed here against your earlier studies.
8635 W 3rd St, Suite 880W
Los Angeles, CA 90048
Monday to Saturday, 11:00am to 8:00pm
Closed Sunday
Frequently Asked Questions
I have just been diagnosed. What happens first?
How urgent is this?
Will I definitely need surgery?
Will I need chemotherapy?
How long does recovery take?
What are the three numbers everyone keeps mentioning?
What does the follow up involve?
How far is your office from Agoura Hills?
Start With the Three Numbers.
Size, site and mitotic index. They determine whether you need surgery, whether you need medication, and how long you are followed. If nobody has told you yours, that is where to begin.
