How to Get a Second Opinion for Cancer (Without Insulting Your Oncologist)

Here’s a sentence I’d like every newly diagnosed patient to hear before they sit down in the oncologist’s office: asking for a second opinion is not an insult. It’s not disloyalty. It’s not going to get you quietly dropped from the practice. It’s the single most routine thing a serious patient can do, and any good oncologist has heard the request a thousand times.

I didn’t ask because I doubted my doctor’s competence. I asked because of what he handed me. Stage 4, chemo to manage it, not cure it. A few years at most. He put it this way: “This is like weeds in the yard. We’ll pull what we can find, but eventually, they’ll keep coming back.”

He wasn’t wrong about what his toolbox contained. I just refused to believe his toolbox was the whole hardware store.

It wasn’t. But I only found that out by going further — and the first crack of light came from somewhere I didn’t expect.

What a Second Opinion Actually Is (and Isn’t)

A second opinion means a different specialist reviews your case independently and tells you what they’d recommend. That’s it. You’re not firing anyone. You’re not “shopping” for the answer you want. You’re checking whether the plan on the table is the plan — or just a plan.

It can confirm what you were told. That’s a great outcome: you walk into treatment knowing two sets of experts landed in the same place. Or it can change the picture — a different surgical approach, a trial you’ve never heard of, a molecular result someone reads differently.

What it isn’t: a reason to stall. I’ll get to that.

Your First Second Opinion Might Be Down the Hall

Here’s what surprised me most: I got completely different answers from different professionals inside the same hospital system. Same case, same scans. Different specialty, different lens.

After my oncologist gave me the weeds speech, I went to see the surgical team about my liver. I asked them the question I was most afraid of: “What if the liver resection doesn’t get it all? What if there’s still a considerable amount left over?”

Their answer: “Don’t worry. We have lots of tools. This is the start. We have many tools in the toolbox.”

It wasn’t a promise. Nobody promised me anything. But it was the first glimpse of hope anyone in that system had given me — from the same hospital that had just told me the weeds would keep coming back.

So your first second opinion might not require leaving the building. Surgeons, radiation oncologists, interventional radiologists — each one looks at the same case from a different angle. Ask every one of them what they’d do, and what they’d do next if that didn’t work.

One Second Opinion Isn’t Enough

If I could go back to day one, this is what I’d tell myself.

A second opinion doesn’t mean calling one more oncologist and asking their take on the same standard-of-care plan. If that’s all you do, there’s a good chance you’ll hear the same answer twice and stop looking. Don’t stop there.

Call as many as you can. Call every facility you can find. Look for trials, and keep looking. Don’t get discouraged because one more oncologist agreed with your first one. Eventually, you’ll find something — or someone — that wasn’t on the table.

I didn’t know that. I was in too much shock to know I even had the option. It wasn’t until about a year in that I really started pounding the pavement. I believe that if I’d started on day one, I’d likely have been spared some procedures and treatments my body didn’t need.

And if you aren’t up to it — and plenty of days, you won’t be — ask someone who cares about you to start making the calls for you.

When You Should Not Wait

Some situations are urgent — a bowel obstruction, bleeding, a tumor that’s actively causing damage. If your team says something can’t wait, ask them plainly: “Can I get a second opinion within the next week, or does this need to start now?” Then listen to the answer. A good doctor will tell you straight. In most non-emergency situations, a week or two to gather records and get another review is completely reasonable, and many patients start treatment while the search is still in motion. Keep looking either way. This is a conversation to have with your own care team, not a call I can make for you.

Who to Go To

For colorectal cancer, especially anything advanced, I’d aim for an NCI-designated comprehensive cancer center. These are the institutions running the trials and seeing the weird edge cases community practices might see once a decade. The National Cancer Institute keeps a public list of designated centers, and there’s very likely one within a day’s travel of you.

Some of the big names in CRC: MD Anderson, Memorial Sloan Kettering, Mayo Clinic, Dana-Farber, City of Hope, Cleveland Clinic, and the NIH Clinical Center if you’re specifically hunting for trials. That’s a starting list, not an endorsement of any one of them — the right fit depends on your stage, your mutation profile, and your insurance.

When I finally started digging, I found two trials that lined up with my specific situation — one at the NIH in Maryland, one at the Cleveland Clinic in Ohio. I booked them into a single road trip: the NIH on the way out, and a Cleveland Clinic consult on the drive home in case the first one didn’t click. Either one would have been life-altering.

The NIH accepted me. For what it’s worth, the drug in the Cleveland Clinic trial — rezatapopt, which targets one specific p53 mutation (TP53 Y220C) — has since posted strong results, particularly in ovarian cancer, and the company is preparing to file for FDA approval. Based on my mutation profile, I likely would have qualified.

The point isn’t those two centers or those two drugs. The point is I lined things up so that one “no” wouldn’t be the end of the road. And notice that both trials were tied to my specific mutations — which is why knowing your molecular results matters so much.

You Don’t Have to Get on a Plane

This is the part that would have saved me some panic. Many major centers now offer virtual or records-based second opinions. You send your records, a specialist reviews them, and you get a written opinion — sometimes followed by a video visit. No flights, no hotel, no dragging a body full of chemo across the country. It also makes the call-everyone approach realistic.

Some are cheaper than you’d think; some aren’t. Ask about cost and what your insurance covers before you send anything. Insurance rules on this vary by plan, and I’m not going to pretend I can tell you yours. Call the number on your card and ask two questions: “Does my plan cover a second opinion?” and “Does it matter whether the center is in-network?” Write down who you talked to and when. If you’ve read my post on insurance and financial navigation, you already know why the name and date matter.

The Records You’ll Need

This is where most people stall, so do it early. Your first call is to the records department, and your patient portal will get you some of this same day:

Pathology report — and ask whether the actual tissue slides can be sent for review. A second pathologist looking at the same slides is worth its weight in gold. (I wrote a whole guide on reading your own pathology report.)
Molecular and genetic testing results — the full report, not the summary. MSI/MMR, RAS/RAF, HER2, TP53, anything else they ran.
Imaging — the reports and the actual scans on disc or via digital transfer. The radiologist at the second center will want to read the images themselves, not your local radiologist’s summary of them.
Lab work — including your CEA trend if you have one. The trend matters more than any single number.
Your doctors’ notes — the visit notes, surgical reports, and treatment plan so far.

Get copies for yourself, not just sent center-to-center. If you’re going to call a lot of places, you want one complete packet you can send anywhere the same day.

You have a legal right to your own records. Ask for them in writing, be polite, be persistent. Records offices are not built for speed, and “I’ll get to it” can turn into two weeks. Follow up like it’s your job — right now, it kind of is.

How to Tell Your Oncologist

This is the part everyone dreads, and it’s a lot less dramatic than you’re picturing. Something like: “I’d like to get a second opinion at [center] to make sure I’ve looked at everything. Can your office send my records?”

That’s the whole speech. A confident, secure oncologist says “of course.” Most do. If one gets defensive or makes you feel guilty for asking, that tells you something worth knowing — about the relationship, not about whether you should go. You’re the one who has to live in this body. It’s your call.

What to Bring to the Second Opinion

Don’t just show up and hope. Go in with a short list:

What treatment have I been offered, and what is the goal — curative or managing it?
Do you read my pathology and molecular results the same way?
Are there options here that the first team didn’t mention — surgery, procedures, sequencing, trials?
If this doesn’t work, what comes next? (This is the question that got me the “many tools in the toolbox” answer.)
Given my specific mutations, are there clinical trials I should be looking at? (Search by mutation, not just “colorectal cancer” — my trial-hunting post covers how.)
If I wanted to be treated here, what would that look like? And could I be treated closer to home under your guidance?

Bring your person. Take notes or record if the doctor allows it. Same rule as always: the shock scrambles your memory, and two sets of ears beat one.

When the Opinions Disagree

Sometimes they disagree, and now you’re holding two expert opinions and feeling like you got dumber, not smarter.

That’s exactly what happened to me. My oncologist and my surgical team looked at the same scans and gave me two very different outlooks. Neither one was lying. They were just standing in different places.

Don’t panic and don’t pick the one that sounds nicer. Get the teams to talk if you can — many will do a doctor-to-doctor call if you ask. Ask each one why they’d go their way, and what evidence they’re leaning on. If they still split, keep going. Disagreement isn’t a sign something’s broken. Cancer treatment has real judgment calls in it, and now you can see them instead of having them hidden from you.

I believe that seeing the whole board mattered more for me than any single doctor’s answer. I can’t prove that. What I can say is that the version of me who accepted the first plan without looking further would have had a very different set of options, and I’m glad I’ll never know how that version turned out.

The Short Version

Don’t wait. Ask — and then ask again, somewhere else. Start with the other specialists in your own hospital. Get your own copy of your records early. Aim for comprehensive cancer centers, check if they’ll do it virtually, and call your insurer first. Look for trials that match your mutations, and keep looking. If you aren’t up to it, hand the phone to someone who loves you. And keep your own oncologist in the loop — the goal is more information, not a dramatic breakup.

The worst case is that you hear the same thing a few times and sleep a little better. The best case is you find the thing that wasn’t on the table.

— Aaron M.

I’m still working on a longer book version of this roadmap — more room to go deep on each piece than a blog post allows. No date yet, but the first 100 newsletter subscribers get a free copy, and that’s where I’ll say when it’s ready. If this post helped, send it to someone who just got the news.

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I’m not a doctor — this is one patient’s experience, not medical advice. Always talk to your own oncologist or care team before changing your treatment, medications, or supplements.

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