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what the heck are ttfields and should I even worry about it right now

Patient · · 108 views
So my oncologist at Karmanos threw this term at me last week, tumor treating fields, and honestly it went right over my head. I'm still recovering from the EPP surgery in Feb so I wasn't really ready to add another thing to the list.

But I asked Dr. Patel to explain it like I'm not a doctor and here's what I got. It's basically this vest thing with electrodes that you wear for like 18 hours a day and it sends some kind of electric current through your chest to mess with the cancer cells so they can't divide or multiply or whatever. Not chemo, not radiation, just electricity basically.

From what I gathered it's newer and they're still figuring out how good it actually works. Some people say it helped, some people say it's just another thing strapped to your body when you're already feeling like garbage from the tune-up. The thing is you gotta wear it constantly and it's bulky so if you're trying to like go back to work or spend time with your family it's kinda in the way.

I'm not doing it right now because honestly I'm only Stage I and my surgeon and oncologist both said let's see how the chemo goes first. But if things don't go the way we want they said it's an option to talk about.

Anybody here actually using one of these things? What's the real deal?

12 Replies

Veteran
Got the briefing on TTFields when I was at the VA clinic in Norfolk back in July, right after my pleurectomy. They hit me with the same pitch. Wear it 18 hours a day, electrodes, the whole nine yards.

Here's what I'll tell you. I'm Stage II and my oncologist said the data on pleural cases is still thin compared to other cancers. They wanted me to consider it after chemo but honestly the recovery from surgery was enough. I wasn't ready to strap another device to my chest when I could barely get through a full day without needing a nap.

Your approach sounds solid though. Let the chemo do its work first. That's what most of the docs recommended to me too. The TTFields thing, it's not going anywhere if you need it down the line. Right now you're still healing from that EPP and that's the priority.

The people I talked to who used one said the biggest complaint wasn't the electricity part, it was the logistics. Can't shower with it, can't sleep easy, can't just throw on a shirt and go. One guy told me he had to change his whole work setup because of the cables and batteries. But if it's buying you time and your numbers are trending the wrong way, that calculus changes quick.

Stay in touch with Dr. Patel about where you're at after chemo cycles through. You'll know more then anyway.
Medical Expert Response
The STELLAR trial is worth looking up when you're ready, it's the main study Novocure ran for mesothelioma specifically and it showed a median overall survival of 18.2 months with TTFields plus chemotherapy versus 12.1 months with chemo alone. Not a cure, and the trial had limitations, but that's a real signal.

What doesn't get talked about enough is the compliance piece. The device tracks how many hours you actually wear it, and the patients in that trial who wore it more than 18 hours a day consistently did better than those who didn't hit that threshold. So the bulkiness Frank mentioned from Norfolk isn't just a comfort issue, it actually affects whether the thing works.

Given you're Stage I post-EPP and still in chemo, your team is right to table it for now. But worth asking Dr. Patel specifically what your compliance target would look like if you do add it down the road, because going back to work while hitting 18 hours a day is... a real conversation to have before you commit.

Talk to your own oncologist before making any decisions on this, but don't let the device intimidate you before you've even seen the data.
3 found this helpful
Patient
Yeah that STELLAR thing is what Dr. Patel mentioned too, 18 months versus 12 is a pretty solid difference when you think about it. And I appreciate you saying the compliance thing out loud because that's the part that kinda scares me honestly. Like I'm not great at sticking to stuff, ask my wife about my diet lol. So if I'm only getting the benefit if I'm actually wearing the dang thing 18 hours a day, that's the real question for me down the road. Right now though I'm just gonna focus on getting through the chemo and see where we're at.
Attorney Expert Response
Not a TTFields user myself but I've had clients who were, and I want to share what I've seen from a practical standpoint since this question comes up more than people might expect.

The device you're describing is the Optune Lua system, FDA cleared for pleural mesothelioma back in 2019 based on the STELLAR trial data. That study showed median overall survival around 18 months for patients using it alongside chemo, which compared reasonably well to historical controls. Not a slam dunk, but the numbers were interesting enough that oncologists started paying attention.

From what clients have told me, the wearability thing is real. One guy I worked with said he could manage it okay at home but traveling even to a doctor's appointment became this whole production. Another said after about three weeks it just became background noise in his routine. So it really does seem to depend on the person.

The Stage I piece you mentioned actually matters a lot here. Your team's instinct to let chemo do its work first and hold TTFields in reserve sounds reasonable given where you are right now. That's not a door closing, that's just sequencing.

One thing worth knowing from a legal perspective, some asbestos trust claims and settlement structures may have provisions that account for ongoing treatment costs including devices like this. Whether that applies to your situation depends heavily on your specific exposure history and which trusts are potentially involved. Please consult an attorney familiar with your state's asbestos litigation statutes, because this varies considerably by jurisdiction.

You're only a few months out from EPP. That's still pretty fresh.
3 found this helpful
Medical Expert Response
Your oncologist gave you a pretty accurate lay explanation honestly. The device is called Optune Lua (the mesothelioma-specific version) and it works by delivering alternating electric fields at a specific frequency, 150 kHz for mesothelioma, that disrupts mitosis (cell division) without the systemic toxicity you get from chemo.

The trial that got people excited was STELLAR, published in 2021. Median overall survival in the TTFields plus chemo arm was around 18.2 months compared to historical controls sitting closer to 12. Not a randomized controlled trial, which is the honest caveat, so the results need to be interpreted carefully. But the signal was strong enough that NCCN added it to guidelines.

The wearability thing is real and I won't pretend otherwise. Patients I've worked with describe it as manageable once they settle into a routine, but the first few weeks are genuinely disruptive. Skin irritation under the electrodes is the most common complaint, around 45% of patients in STELLAR reported it, usually mild to moderate.

Here's the thing though, given you're Stage I post-EPP and still in the chemo phase, your team is thinking about this exactly right. You'd revisit it if the picture changes. Recovery from EPP through February is still pretty fresh. That's a lot to be carrying already.

Definitely keep this conversation going with Dr. Patel as things progress, your oncologist knows your specific pathology and margins and that matters a lot for timing.
2 found this helpful
Patient
Yeah I appreciate you breaking that down, doc. So if I'm reading this right, the STELLAR thing showed it actually added some real months compared to just chemo alone? That's the kind of specifics my oncologist kinda glossed over when he was talking through it. How much of that benefit do you think carries over to somebody like me who's Stage I and caught it early, or is that data mostly from people who were further along?
Patient
I'm peritoneal so different situation, but I looked into the studies on this when my oncologist mentioned it during my pre-HIPEC workup. The data's still pretty mixed from what I found, especially for stage I. Sounds like your docs are taking the right approach waiting to see how you respond to chemo first.
Patient
Yeah that's what I'm thinking too. My gut tells me they're not just blowing smoke when they say stage I is still pretty early to throw everything at it. Did your docs ever circle back on it after your HIPEC, or did they just let it drop once that was done?
Family
My mom's oncologist at Mayo mentioned this too after her EPP back in September and honestly it stressed me out even more just hearing about it. Like she's already dealing with so much and now there's this vest situation? But her team said pretty much what yours did - let's see how the chemo response looks first and then reassess.

What I've learned from being in the Facebook groups and talking to other caregivers is that the people who seem to have better luck with it are the ones who weren't completely wiped out from aggressive chemo cycles. The vest thing is real and it IS bulky. One woman I chatted with said she couldn't really work her normal job because of it but her husband helped her figure out wearing it mostly at night and early mornings. Everyone's situation is different though.

The thing that helped me stop freaking out about it was remembering that your doctors aren't saying you HAVE to do it right now. They're saying it's a tool that exists if you need it later. Stage I is different from where my mom is anyway, so you might not even get to that point depending on how things go. I know it feels like everything is getting piled on at once but honestly you're being smart about taking it one step at a time.

How are you feeling recovery-wise from the surgery? I remember when my mom was post-EPP in those first few months it was rough just trying to get her stamina back.
Veteran
I haven't dealt with the vest myself yet but my oncologist at VA San Diego mentioned it as a possibility down the road depending on how things go. Stage II here so we're a bit further along than you but not drastically different.

From what I've gathered talking to other guys at the VA and reading up on it, the thing is still pretty new so there's not a ton of long-term data. Some studies show it helps, some show it's marginal. Your doctors are smart to pump the brakes and see how chemo responds first. No point strapping yourself into an 18 hour a day contraption if you don't need it yet.

The guys I know who've used it say the same thing you mentioned, it's bulky as hell and wearing it that many hours gets old fast. One vet at the VA clinic said he wore it for about three months back in 2024 and gave up because he couldn't sleep properly and it was messing with his work schedule. But he also said he wishes he'd stuck with it longer and now he's kicking himself. So it's one of those things where you won't really know if it works for you until you try it.

My take is don't stress about it right now. Get through the chemo, see where you land, and if your docs say the cancer's still progressing then you revisit the conversation. At least you know it's there as an option. That's more than a lot of us had five years ago. How are you feeling post-surgery overall.
Patient
Yeah that makes sense, sounds like we're in kinda the same boat then. I'm glad your docs are taking the wait and see approach too, cause honestly after the EPP I'm just trying to get through the chemo without strapping a vest to myself. Good to know there's not a bunch of long-term data yet though, that actually makes me feel better about hitting pause on it.
Patient
yeah karmanos is solid, glad they're letting you hold off on it for now. i'd probably do the same thing at stage 1, no point strapping yourself into something extra if the chemo's doing its job.

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