Toxicities from CAR-Ts, bispecifics, and TILs

Pauline summarizes resources and guidelines for CAR-T and bispecific toxicities and emerging overlaps with checkpoint IRAEs.

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Dr. Monty Pal and Dr. Pauline Funchain discuss the latest efforts to diagnose, prevent, and treat the series of immune-related adverse events that have emerged in the era of immunotherapy.

TRANSCRIPT

Dr. Monty Pal: Hello, and welcome to the ASCO Daily News Podcast. I am Monty Pal, a medical oncologist, professor and vice chair of medical oncology at the City of Hope Comprehensive Cancer Center in Los Angeles, California.

Now, it is probably no surprise to this audience that immunotherapy has transformed the treatment landscape for multiple cancer types. It remains a pillar of modern oncology. Having said that, I think we have all been baffled by certain toxicities that we run into in the clinic.

Today, I am delighted to be joined by Dr Pauline Funchain to discuss some of the checkpoint inhibitor toxicities that people struggle with most. And we will also touch on some side effects of immunotherapy beyond checkpoint inhibitors: CAR-T cells, bispecifics, so on and so forth.

Dr Funchain is a dear friend, and she is an associate professor and associate director of cancer research training and education at the Stanford Cancer Institute. She is co-director of the Immunotherapy Toxicity Program and the Skin Cancer Genomics Program at Stanford, where she also serves as associate program director of hematology and oncology fellowship. Dr. Funchain is also the co-founder of ASPIRE, and we are going to talk about that a little bit today, the Alliance for the Support and Prevention of Immune-Related Events.

FYI for listeners, if you are interested in our disclosures, they are available at the transcript of this episode.

Pauline, thanks so much for joining us today.

Dr. Pauline Funchain: Monty, thank you for this invitation. It is always great to talk.

Dr. Monty Pal: So, for the audience, Pauline and I know each other from my days as a fellow at City of Hope. She was a resident at Harbor UCLA and a stellar resident at that. It has just been amazing to sort of see your career grow and blossom and to witness all the cool things that you are doing.

ASPIRE, in particular, sort of caught my eye. So again, for listeners, this is the Alliance for the Support and Prevention of Immune-Related Events. Can you tell us a little bit briefly about the genesis of that, how that came about?

Dr. Pauline Funchain: So, there was a bunch of us who were really struggling, I mean, all of us have struggled with these immune-related adverse events, these irAEs. You know, they are new disease states, and even though they look like autoimmune diseases, they tend to need a whole lot more steroid than autoimmune diseases do and they do not totally present in the same way. And in fact, you know, Triple-M, or Triple-M overlap syndrome, is a completely new irAE, a new immune state that we have never had before the advent of checkpoint inhibitor. And so a Triple-M, for those of you who are not as familiar, that is the constellation of myocarditis, myositis, and myasthenia gravis, something that never occurs as a natural autoimmune disease.

So we were starting to realize that there were some major differences with these irAEs and autoimmune diseases. We could not treat them the right way. We really needed to learn more about them. And a bunch of us who had interest in this said, "Look, we really need to be all in one space to talk about what we are doing," because all of our treatments were our own little homegrown brews, and we needed to really get together and understand how to treat these things, how to diagnose them, and then learn more about them.

So, Dr. Alexa Meara from Ohio State, Dr. Kerry Reynolds from Mass Gen, we put together this research consortium, brought together all of our irAE friends, got our best subspecialists together in a research consortium, which is now only about a year and a half old. And we made this research consortium, the Alliance for Support of Prevention of Immune-Related Events, and we reached out to ASCO, and ASCO was so kind to grant us a [Alliance for Support and Prevention of Immune-Related adverse Events (ASPIRE)] Community of Practice. So we met for the first time as a Community of Practice at the ASCO Annual Meeting just this past June and really got an ASCO community together to really think about how to again, diagnose, prevent, treat irAEs.

Dr Monty Pal: This is interesting to me. The ASCO Community of Practice phenomenon is something that I was not super familiar with. Can you explain to our listenership what is the ASCO Community of Practice model? If you have particular interests, how do you sort of get one started?

Dr Pauline Funchain: Yeah, so ASCO has an entire page on their Community of Practice. There are multiple Community of Practice groups or COPs. There are ones for Supportive Oncology and Survivorship. There is Women in Oncology. There is a group for International Medical Graduates. And there is about, I think 10 or 12 now that have a physical presence at ASCO but also a virtual presence on the ASCO Community of Practice site. So, if you were interested in any one of these, and you can see them on the ASCO Communities of Practice sites, you would ask to become a member. Once granted membership, then there is a whole webpage of postings and conversations that people can have. You can get email digests of conversations that happen on the website, and then you can anchor it with in-person participation at the Annual Meeting.

Dr Monty Pal: That is awesome, and I can think of so many different foci within oncology that really sort of deserve a Community of Practice. This definitely being one of them.

You know, it strikes me as being so interesting. I mean, the checkpoint inhibitors have been around for a while now. I think when you and I were in training, gosh, back then, these were just a little bit of a pipe dream, right? But having said that, I would probably say that more than half of my kidney cancer practice is either on checkpoint inhibitors, and the vast majority have been on one at some point in their past, right? With that in mind, you know, we have all treated a lot of patients with these drugs. Why is it that we still struggle to manage the toxicities? And just to take that one step further, what are some of the toxicities that, perhaps through ASPIRE or through your experience, people struggle with the most?

Dr Pauline Funchain: So, I think we are still struggling with these because again, they are new disease states, right? This is what we all experienced with COVID, a brand-new virus and a brand-new syndrome. We now have 20-plus of these as irAEs. And what we have realized about them is the immune activation that happens with these is so much more than what we have seen with autoimmune diseases. So for instance, if you have a Crohn's or ulcerative colitis, you will top out at 40 to 60 milligrams of prednisone if a Crohn's flare or ulcerative colitis flare happens. But for our severe IR colitises, you know, it is at least 1 mg per kg, often goes up to 2 mg per kg. We, in some cases, have done 1 gram pulses if we are worried that somebody is going to perforate. So that was sort of like the first 5 years of treating irAE, and then now in the sort of second 5 years of treating irAE, we have realized that that is a lot of immunosuppression, and we might be able to get away with less with the newer biologics that are on board.

So, we are struggling to try to get the data for some of these irAEs that we knew, we have known for a while, but to try to get newer treatments that may immunosuppress less so that you may still be able to retain that tumor response. And in fact, some of the preclinical studies suggest that some of these biologics may actually synergize with the immunotherapy and actually make the immunotherapy more effective from a tumor perspective and calm down the irAE as sort of the bystander effect. So we are still trying to optimize those. Getting up trials in the space has been very difficult. That is one of the reasons for the genesis of ASPIRE because we realized we needed to band together to have a bigger voice in that realm.

Then there are other things that are brand new. So we talked about Triple-M. So Triple-M, again, with Triple-M or any myocarditis or myasthenia, I mean, there is about a 50% chance of death from irAE based on the literature. I think we are getting better at recognizing this, and so at Stanford we have some data to say that if you serially follow troponin, that maybe your outcomes are better. You can potentially lower the percentage of cases that are fatal because you can catch them early. I mean, this is all preliminary data, but again, these are all things that are evolving, and we do not all have the right answer. I mean, even the serial troponin thing, I think, is pretty controversial. And in fact, at one of our quarterly Zoom meetings that we are doing in ASPIRE in December is going to sort of flush out that controversy about serial troponin measuring and what is the best thing to use? Would you use something like abatacept or would you use ruxolitinib? Which one is better? I think there is a lot of controversy still about these things.

Dr Monty Pal: You have really piqued my curiosity here because you think about the cons of treating irAEs, right? And I worry exactly about what you had mentioned, right, which is, "Gosh, what is going on with this tumor in terms of immunosuppression?" But you think about some of the newer agents, you mentioned ruxolitinib, I have heard of dasatinib, for instance, in this setting. Frankly speaking, a lot of these, as you point out, are really thought of as being also anticancer drugs. So you have really got me thinking about the potential synergy between perhaps suppressing an irAE and augmenting antitumor activity, which I think is very interesting. Am I on the right track with that?

Dr Pauline Funchain: I think so, but you will find that a lot of people will not even go there because they are worried about how much immunosuppression you are going to cause. I am at heart a geneticist, but I think an immunologist will happily tell you that the immune system is very complex. There are multiple pathways, and these drugs do not all target the same immune pathways. So if we understand a little bit more about the pathways we are targeting and pick apart the pathways that are really, really tumor relevant and the other pathways that are not tumor relevant, you may be able to piece together a better marriage of tumor response and irAE control.

Dr Monty Pal: Kind of on this topic, and again, leaning on your background in genetics, where are we in terms of predicting these irAEs? I mean, you would think the holy grail would be picking out a snip or something of this for it, right, that could potentially identify that patient who is going to get Triple-M or, you know, at the very least a significant high-grade irAE event. Are we anywhere closer to that in 2025?

Dr Pauline Funchain: There have been data published. There have been some big GWAS studies. All of the effect sizes are pretty small. So there are some prediction algorithms, but none of them are clinically useful. And I think when you look at the odds ratios, they will increase risk by maybe 20%. I think one of the things that we found in a very small series and supported anecdotally is something as easy as family history of autoimmune disease is probably more predictive at this point than any of those types of markers. I think we will get there, but we are not anywhere near where we would like to be. Things like TMB also, actually, there is some good data about higher TMB, higher risk of irAE too.

Dr Monty Pal: Interesting. I see all this data coming through, IL-8 polymorphisms, etc. And I just wondered if any of that was ready for prime time. But I mean, this is a good message for the practicing clinician. Sounds like we are not quite there yet.

And I could probably keep you on for another entire podcast to talk about this topic, but let us see if we can at least skim the surface. I never thought I would see the day when BiTEs and CAR-Ts were entering into my kidney cancer practice, but in fact, it is really become central to a lot of our clinical trials in RCC these days. I would be lying if I did not say that I was not struggling with the toxicities and so forth associated with these drugs. Can you give us a quick primer, maybe just good resources that people can go to for managing toxicity with BiTEs and with CAR and with some of these novel therapeutic modalities that we are using in the oncology clinics?

Dr Pauline Funchain: I know there is a recently published toxicity manual for BiTEs in hematologic malignancies, I think it was in Blood. CAR-T is covered in many irAE guidelines. So ASCO guidelines actually has a CAR-T [cell therapy guideline], and I would be remiss not to point out that actually ASCO has a, I am a little biased, but a wonderful guideline on irAE that is actually being updated as we speak. We are hoping for publication next year.

I find the format of that, there are many guidelines out there, actually. There is ASCO, SITC, ESMO has a guideline for irAE, but I find the formatting of the ASCO guideline to be much easier to flip through during clinic, just because of the visual format of the tables. But that is going to be updated next year. And with CAR-T, there is now multiple publications also in terms of guidelines.

But what I will say about bispecifics and CAR-T, so they have very similar toxicities in terms of the cytokine release and also with the ICANS, so the neurotoxicity. But what we have been finding that is really interesting with BiTEs and CAR-T, and actually even with TIL, cytokine release is very similar to some of the IL-2 toxicities but not identical that we see with TIL treatment. But now we are starting to see overlap. So patients who have been treated with immunotherapy and then go on to get a bispecific or then go on to get TIL, so I have seen some colitises that have occurred after the fact. Some of the newer CAR-Ts without checkpoint have been causing some really interesting, probably not in a good way, but interesting biologically, colitises that are really refractory. So we are starting to see some overlap, and again, I think this field is just evolving constantly.

Dr Monty Pal: Yeah, no, I almost think I need to go back to that fellowship that you and I did together 20 years ago and, you know, and see if I could repeat some coursework on CAR-T management.

You know, Pauline, I could probably keep you on the horn for hours, but this has just been terrific. Thank you so much for sharing all of your insights with us today on the ASCO Daily News Podcast.

Dr Pauline Funchain: Thank you for the invitation. It was wonderful to talk about this, and it was wonderful to catch up a little bit, Monty.

Dr Monty Pal: Same here, same here. And thanks to our listeners too. If you value the insights you heard today on the ASCO Daily News Podcast, please rate, review, and subscribe wherever you get your podcasts.

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