GIST Specialist for Larchmont, CA
This page is written for the person coming with the patient. If someone you care about has just been told they have a gastrointestinal stromal tumor, there are specific and useful things you can do, and this sets out what they are.
- Family members welcome at every consultation
- Clinical Professor of Surgery, Cedars-Sinai Medical Center
- Ten to fifteen minutes west along 3rd Street
- Records requested from other institutions on your behalf

The Useful Things Are More Practical Than You Expect
People who have just been given a cancer diagnosis are generally not in a good state to organise anything. They will be handed a report they cannot interpret, asked to make decisions they have no framework for, and expected to chase records between institutions while doing it. That is where a family member is genuinely valuable, and it is more useful than reassurance.
The first thing is paperwork. A specialist opinion is only as good as the material it rests on, and most patients turn up with a summary rather than the actual imaging. Requesting the scans in their original format, the full pathology report, and any mutation testing is a task that suits someone with a clear head and a phone. It can be started before any decision about where to be seen.
The second is the consultation itself. A GIST appointment covers a great deal in a short time: what the tumor is, where it sits on the risk scale, which operation is proposed, whether medication comes before or after. One person cannot absorb all of it while also processing what it means. Come along, write things down, and ask the questions the patient is too overwhelmed to formulate.
The third is the long tail. GIST follow up runs for years, sometimes with three years of daily medication. That is where quiet support matters most and where it is most often absent, because by then everyone has assumed the crisis is over.

What to Do, and When
Nothing here requires medical knowledge. All of it makes a measurable difference.
| Stage | What helps | Why it matters |
|---|---|---|
| Before the first appointment | Request imaging in its original format, the full pathology report, mutation testing, and any previous operative reports | A specific surgical opinion needs the actual data. A radiology report omits the detail the operation depends on |
| At the consultation | Come along. Take notes, or ask about recording it | Nobody retains a conversation covering risk grading, surgery and medication while also absorbing a cancer diagnosis |
| Deciding on treatment | Ask whether the mitotic index, mutation subtype and risk category have been established | If any is missing, the plan is being made without it. This is a reasonable question from a family member |
| First days after surgery | Company, fetching things, and watching for fever or worsening pain | Most patients manage independently within days, but the first two are easier with someone there |
| Weeks two to six | Cover anything involving lifting, carrying or heavy household tasks | The lifting restriction prevents a hernia at the incision. People break it because they feel well, and that is the risk |
| Months and years after | Notice when medication side effects are wearing them down | Adherence over three years affects outcome. People stop quietly rather than asking for a dose adjustment |
If you are the one holding all of this together, the hospital has social work and support services. Using them is not an imposition and it is not a sign you are failing at it.

What a GIST Diagnosis Actually Means
If you have been reading about sarcoma generally, a good deal of it will not describe this situation. GIST occupies an unusually favourable position among these tumors and it is worth knowing that before the conversation.
It arises from pacemaker cells inside the wall of the digestive tract, and nearly all carry a mutation that targeted tablets were specifically designed to block. Complete surgical removal of a localised tumor is often curative, and for most tumors in the stomach that operation is modest, frequently through incisions under a centimetre with a night in hospital. Even where disease has spread, targeted therapy commonly controls it for years, with an established sequence of further drugs if resistance develops.
Risk is graded rather than binary, using three things: how large the tumor is, where it sits, and how fast the cells are dividing. Those three numbers determine everything that follows, including whether medication is needed at all. A small gastric tumor with a low mitotic count may need nothing beyond a modest operation and a few years of scans.
Asking where on that scale your relative sits is the single most clarifying question available, and the answer is frequently more reassuring than the word cancer suggests.
What the Operation Involves
Recordings of real GIST resections narrated by the surgeon who performed them. Some families find it helpful to see what is actually being proposed. Others would rather not, and that is equally reasonable.
Laparoscopic Resection of a Gastric GIST
A gastric GIST removed through small incisions with the capsule kept intact.
Gastric GIST Resection: A Simplified Approach
A refined approach that shortens operating time and recovery.
Robotic Resection of a Duodenal GIST
Duodenal GIST removed robotically with the pancreas and bile duct preserved.
Where Are They on the Risk Scale?
Size, site and mitotic index give a category, and the category determines whether medication and long term surveillance are needed. If nobody has stated it, that is worth pressing on, and it is an easier question for a family member to ask.
Certifications and Appointments
Two American Board of Surgery certifications, a Cedars-Sinai teaching appointment, and membership of the societies that set the standards for this disease.





- 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.
Consultations here are conducted as conversations rather than briefings, and family members are expected rather than tolerated. That matters more with a rare tumor than a common one, because there is no reservoir of general knowledge to fall back on: nobody in the room has a friend who had this, and there is no widely understood script for what happens next. Explaining the reasoning properly, to whoever is present, is most of what the appointment consists of.
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.

Questions a Family Member Can Ask
These are often easier to ask on someone else behalf than on your own, and every one of them changes the plan.
- What is the mitotic index on the pathology report?
- Which risk category does that put them in?
- Was mutation testing done, and what did it show?
- Which operation is proposed, and how much is removed?
- Is a minimally invasive approach realistic?
- Would medication before surgery make the operation smaller?
- Will they need imatinib afterwards, and for how long?
- What is the 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.
★★★★★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
★★★★★Very kind stuff, great service. Dr Joshua Ellenhorn is a very calm doctor who takes time with his patient.
Anita Lukacevic
Ten Minutes From Larchmont
Third Street west takes you straight to the medical plaza at 8635 W 3rd St. From the northern end of Larchmont, Beverly Boulevard west then south is equally direct. Ten to fifteen minutes in ordinary conditions.
Being this close genuinely helps when you are the one driving someone to appointments. The office is attached to Cedars-Sinai Medical Center, so imaging, pathology, consultations and surgery are in one building rather than spread across the city, which reduces the number of trips considerably over the course of treatment.
Patients travelling from outside the region, including Arizona and Nevada, can have imaging and pathology reviewed remotely first.
8635 W 3rd St, Suite 880W
Los Angeles, CA 90048
Monday to Saturday, 11:00am to 8:00pm
Closed Sunday
Frequently Asked Questions
Can I come to the appointment?
What is the most useful thing I can do beforehand?
What help will they need at home after surgery?
What warning signs should I watch for after the operation?
They are on medication for three years. How can I help with that?
How much should I push them to get a second opinion?
Is there support for me, not just for them?
How far is your office from Larchmont?
Come to the Appointment.
Bring the imaging, bring a notebook, and ask where on the risk scale they sit. Those three things do more than anything else available to you.