Journal of Clinical Oncology (JCO) Podcast

JCO Editorial Fellow Peter Li and author Dr. Jahanzaib Khwaja discuss the ASH 2025 Simultaneous Publication article, "A New Validated Staging System for AL Amyloidosis With Stage lllC Defining Ultra-Poor Risk: AL International Staging System."

TRANSCRIPT

The disclosures for guests on this podcast can be found in the show notes.

Dr. Peter Li: Welcome to this episode of JCO Article Insights. I am Dr. Peter Li, JCO's Editorial Fellow, and today, I am joined by Dr. Jahanzaib Khwaja on a new validated staging system on AL amyloidosis with stage lllC defining ultra-poor risk, AL International Staging System. This is a simultaneous publication that will be presented at this year's ASH Conference.

At the time of this recording, our guest has disclosures that will be linked in the transcript.

So, Dr. Khwaja, let's start off first: What would you say is the significance of your study?

Dr. Jahanzaib Khwaja: Thank you very much. This is an important study in that, in the current treatment era, we have really improved outcomes of patients with systemic AL amyloidosis. Traditionally, the staging systems that have been employed, which are the Mayo 2012 and the European modification 2016, have been founded in eras where there were historic treatment protocols.

So the significance of this new staging system is looking at outcomes of patients in the modern treatment era. That is patients who are treated with daratumumab-based treatments in the first line. And this is kind of the largest study which is externally validating a new prognostic model in the current treatment era with modern outcomes.

Dr. Peter Li: Can you tell our listeners what is different about your new staging system?

Dr. Jahanzaib Khwaja: The traditional staging systems, the Mayo 2012 and the European modification of 2016, looked at outcomes of patients with systemic AL amyloidosis with historic treatment protocols. And we know that they looked at outcomes according to an NT-proBNP and troponin, and in the Mayo 2012, they looked at it with the addition of the dFLC, which is the difference in the involved and uninvolved free light chain.

Over the years, we have seen that outcomes have improved, and over decades, actually, outcomes are much better when we compare them to the previous decade. If we look at current treatment approaches, those traditional staging systems inadequately determine the poorest prognostic risk. So they are unable to tell us those who are going to perform poorly.

Our current new validated staging system looks at the traditional NT-proBNP and troponin but uses the addition of the longitudinal strain. This is an echocardiographic parameter, and it is used widely in treatment centers who treat amyloidosis. This really identifies those ultra-high risk patients, and these are the patients who will perform poorly in current treatment protocols.

And why is that important? Well, we need a robust staging system in the current treatment era which can stratify patients who will do well but also stratify those patients who do not do well. Because that is important for counseling patients, for risk stratification, for treatment approaches, and in the future, for designing clinical trials.

Dr. Peter Li: And that is referring to the longitudinal strain greater than -9% and NT-proBNP greater than 8,500 and then the high-sensitivity troponins greater than 50, which will define the new staging system. Can you talk more about how you picked these cutoffs and also what that alludes to in terms of the outcomes that you have discovered in this age of daratumumab-based therapy?

Dr. Jahanzaib Khwaja: Yeah, that is a really excellent question because we have aimed to build upon traditional staging systems. So clinicians have used these traditional models for many, many years, and they have robustly underpinned our stratification of patients and how we counsel patients. So we didn't want to change some of these well-established thresholds, but we wanted to test them in the current treatment era. So the NT-proBNP of 8,500 and the high-sensitivity troponin of 50 were the traditionally used thresholds. And they actually stand the test of time.

But we found that longitudinal strain additionally and independently predicts outcome independent of these other biomarkers. It is independent actually as a continuous variable, so you can cut this at a number of different stratification points and find independence. But we wanted to determine and discriminate those with the poorest outcomes. So we validated a longitudinal strain threshold of greater than -9% by deriving this from a dataset of patients with the traditionally highest risk. Those are with European stage lllB. And looked at the optimal threshold with time-dependent ROC analysis.

So we did this in our derivation cohort and then validated this externally in our external validation cohort amongst a number of centers in Europe, in the US, and in the UK. And it is important to note because longitudinal strain is an echocardiographic parameter, and traditionally the limitations are considered to be inter-vendor and inter-operator variability and intra-operator variability, and there are challenges with reproducibility of some of these measurements. So that is often cited as a limitation. But we found, when we have externally validated this across different centers using different platforms, actually the threshold of -9% is independently predictive of poorer outcomes independent of the traditional NT-proBNP and troponin thresholds, and it is robustly predictive of poorest outcomes.

We know that those with stage lllC have a median overall survival of 4 to 7 months in the modern treatment era. And if we sub-stratify these by patients treated with daratumumab, outcomes have improved, but still, even if we look at daratumumab-treated patients, one-year overall survival is still only around 50 percent. So these are a poor risk group in the modern treatment era.

Dr. Peter Li: Which kind of makes sense in a way because this kind of predicts whether they have amyloid-related cardiomyopathy. So I think this all tracks with our listeners. But given the poor outcomes even with daratumumab-based therapies, do you think this new staging system would change practice, if at all?

Dr. Jahanzaib Khwaja: Yeah, I think that is a really good point because I think it comes to the question of why we use a staging system. What are its applications? I think one of the key things we think about in the clinic is how do we counsel patients when we first talk to them about their diagnosis. So there is a lot of information, but predominantly people want to know, what is my outlook going to look like?

And as I say, in the bortezomib treatment era, 2010 to 2020, we used to say you have stage lllB, you have very poor outcomes, median survival maybe around six months. We have shown here that actually those with lllB have much better outcomes definitely over 12 months, up to 24 months in those with daratumumab-based therapies. So we need to counsel them in a different way.

We then also need to say, "Well, who are the ultra-high risk?" So we said those with the longitudinal strain of greater than -9% with the traditional NT-proBNP and troponin cutoffs. And those patients will have poor outcomes. We need to talk about palliation. We need to talk about alternate treatment approaches.

And then importantly for the community is about treatment and clinical trial design. So again, traditionally the traditional high-risk group lllB used to be considered an exclusion for all major trials. So these were excluded in the ANDROMEDA study, which led to the approval of daratumumab-based therapy, and multiple other trials. And we show here that actually patients with lllB should not be excluded from these studies because they do have good outcomes.

And I think we make the important point that those with lllC, who do have poor outcomes, they need a different treatment approach, and we need to think about stratifying these patients differently. So perhaps the next modality of treatment will be the anti-fibril antibodies or a mode of treatment which can clear antibodies or clear the amyloid fibrils from the organs and reduce the organ toxicity early on.

We know that those with lllC have poor outcomes particularly within the first year, and organ dysfunction really predominates here. So a different treatment approach is required, and we need to design trials specifically for these patients which look beyond anti-plasma cell clone therapy but also look at clearing the amyloid fibrils and improving organ function as this is predominantly the cause of death in these patients.

Dr. Peter Li: That's an excellent point right there.

Do you foresee any limitations to this new staging system, or can you comment on is there potentially a better way to refine this staging criteria in the future?

Dr. Jahanzaib Khwaja: Yeah, I think that is a really excellent point to consider, that staging systems always need refining across treatment eras. So we have looked at the bortezomib era, and then we have validated this in the daratumumab-based era. We know that amongst different countries access to treatment varies. We know that there are a number of factors which determine your health-related outcomes. That's access to healthcare, speed of diagnosis, access to tertiary diagnostics, ability to biopsy, and then supportive care.

And I think our staging system highlights the importance of organ dysfunction predominantly causing death early on. And I think that as treatments improve this should be refined. So the expectation I think is, as we have better anti-plasma cell directed therapies, and as we hopefully develop anti-fibril antibodies and anti-fibril clearance drugs, that we will need to revalidate new models to effectively prognosticate in this treatment era.

And I also think that as we become a bit more sophisticated with our approaches, we know that this can be refined in the future looking at other prognostic factors with regards to healthcare outcomes. I would say one of the strengths, however, of this model is that it builds on the traditional model, and it's quite simple to use. You just have the NT-proBNP and the troponin, and then longitudinal strain, which is used quite frequently in amyloid centers, and an echocardiogram is used in essentially all patients for diagnosis. So I think it will certainly be quite practical.

But certainly I think, as you say, as treatment approaches change over time, and as we have further options in the future, we will need to refine prognostication.

Dr. Peter Li: For the listeners out there, let's say someone comes in our clinic and we diagnose them with stage lllC amyloidosis. Can you comment on what clinical trials are out there that potentially they can refer their patients to? You mentioned anti-fibril therapy, which I think would be the way of the future. Can you kind of comment what you know at this current stage and point listeners in the right direction?

Dr. Jahanzaib Khwaja: This is the challenge in amyloidosis. We don't have specific trials that are looking at those with the highest risk. And at present, even the ISA International Guidelines talk about risk according to the old treatment approaches and discuss attenuating our current chemotherapy approaches. And I think that for clinicians out there who identify those at the highest risk, it is really important to have a multidisciplinary approach, to consider palliation and palliative services early, and really work with your fellow cardiologists and renal physicians and neurologists to enable the best supportive care you have in order to deliver this anti-plasma cell directed therapy.

We know that actually you only need for most patients small amounts of doses of chemotherapy to get good clonal responses, and we have seen that even in the bortezomib era that actually they have good CR rates and more impressive CR rates with daratumumab. But because of the organ dysfunction, it can be really challenging to deliver these doses. And supportive care is going to be really important particularly for these challenging patients.

The future will be designing clinical trials that are appropriate for these patients. At present, we currently don't have available options, but I think the more we gather this data, the more we work collaboratively as a community, we will be able to mobilize our resources and get the best outcomes for these patients.

Dr. Peter Li: First build the field of dreams and then hopefully more therapies will arrive in the future.

Thank you so much, Dr. Khwaja, for speaking about the JCO article, "A New Validated Staging System for AL Amyloidosis With Stage lllC Defining Ultra-Poor Risk: AL International Staging System," and for all your valuable input today.

Dr. Jahanzaib Khwaja: Thank you very much.

Dr. Peter Li: Make sure to check out the presentation at this year's ASH Conference taking place from December 6 to December 9. Thank you for listening to JCO Article Insights. Please come back for more interviews and article summaries and be sure to leave us a rating and review so others can find our show. For more podcasts and episodes from ASCO, please visit asco.org/podcast.

The purpose of this podcast is to educate and to inform. This is not a substitute for professional medical care and is not intended for use in the diagnosis or treatment of individual conditions.

Guests on this podcast express their own opinions, experience, and conclusions. Guest statements on the podcast do not express the opinions of ASCO. The mention of any product, service, organization, activity, or therapy should not be construed as an ASCO endorsement.

In this episode of JCO Article Insights, host Dr. Ece Cali Daylan interviews author Dr. Jeffrey Bradley about the article, "Simultaneous Durvalumab and Chemoradiotherapy in Unresectable Stage III Non–Small Cell Lung Cancer" by Bradley, et al published October 13, 2025.

TRANSCRIPT

Dr. Ece Cali: Welcome to this episode of JCO Article Insights. This is Dr. Ece Cali, JCO Editorial Fellow. Today I'm joined by Dr. Jeffrey Bradley, Professor of Radiation Oncology at the University of Pennsylvania, to discuss the manuscript, "Simultaneous Durvalumab and Platinum-Based Chemoradiotherapy in Unresectable Stage III Non-Small-Cell Lung Cancer: The Phase III PACIFIC-2 Study."

The PACIFIC-2 study was a phase III, double-blind, randomized trial comparing the efficacy and safety of simultaneous durvalumab with concurrent chemoradiation followed by consolidation durvalumab to the concurrent chemoradiation followed by placebo in patients with unresectable stage III non-small cell lung cancer. The primary endpoint was progression-free survival by blinded independent central review. The secondary endpoints were overall response rate, overall survival, and safety.

Three hundred twenty-eight patients were randomized 2:1 to durvalumab and placebo, respectively. Unfortunately, this trial did not meet its primary endpoint. There were no statistically significant differences in PFS or OS. The frequency of adverse events was similar between the two arms. Grade 3 or higher adverse events were observed in 53% of the patients in the durvalumab arm compared to 59% of the patients in the placebo arm. Of note, the frequency of pneumonitis was similar in the two arms. Approximately 28% of patients in each arm developed pneumonitis, and about 5% of the pneumonitis observed in each arm was grade 3 or higher in severity. Treatment discontinuation rates secondary to the adverse events were higher in the durvalumab arm, 25% compared to 12%. Adverse events leading to treatment discontinuation and death were more frequently seen in the durvalumab arm during the first four months of the treatment, which corresponds to the simultaneous administration of chemoradiation and durvalumab.

Dr. Bradley, before we delve into the results, can you please explain the rationale for this study design and how this concept fits into the current treatment landscape?

Dr. Jeffrey Bradley: Yeah, this trial came on the heels of PACIFIC after there was a progression-free survival benefit showed in PACIFIC that in the locally advanced unresectable population that consolidation immunotherapy, in this case durvalumab, had a progression-free survival benefit. A number of us in the clinical trial space thought to add concurrent immunotherapy in addition to consolidation immunotherapy that that would also improve outcomes for patients. So a number of trials were launched to follow up of PACIFIC.

In this case, this is a phase III trial where the control arm was placebo. There was no overall survival results yet from PACIFIC, just a PFS benefit, and a number of countries across the world had not approved maintenance durvalumab in this space. So this trial looked at the experimental arm, which was concurrent immunotherapy, durvalumab, and chemoradiation followed by consolidation durvalumab versus placebo.

Dr. Ece Cali: And if we were to focus on the safety profile first, an increased pneumonitis risk was a theoretical concern when immunotherapy is given concurrently with radiation. Do we see any major differences in the safety profile between the two arms in this trial?

Dr. Jeffrey Bradley: No, and we were concerned about the addition of concurrent immunotherapy and chemoradiation, like you said, towards concern about increased pneumonitis rate, but we did not see increased pneumonitis in the experimental arm over placebo. And the grade 3 or higher, as you said, it was roughly 5%, more or less, in both arms, so we didn't see increase in pneumonitis toxicity with concurrent IO and chemoradiation.

Dr. Ece Cali: But interestingly though, despite the lack of significantly increased toxicity with durvalumab, unfortunately, administering immunotherapy simultaneously with chemoradiation therapy did not improve survival. Lack of superiority of this treatment regimen, as you mentioned, is further confirmed across multiple similar negative trial readouts such as ECOG-ACRIN 5181 and CheckMate 73L. Dr. Bradley, in your view, what are some potential explanations for why this strategy did not pan out in clinical trials?

Dr. Jeffrey Bradley: Regarding toxicity, let me go back and point out that we did see an increased number of immune-mediated adverse events. It was 34.7% in the concurrent immunotherapy arm versus 15.7% in the placebo arm. So that led to a higher number of discontinuations of immunotherapy which I think probably had an effect. So we didn't... there was an increased pneumonitis toxicity, but there were expected immune-mediated toxicities that caused people to stop giving immunotherapy. You can see that in the PFS curves. They were, you know, they crossed over after like a month, but initially there was lower PFS for the experimental arm, and then the experimental arm got better after we divided into four months, before four months and after four months.

Dr. Ece Cali: For one reason or another, it looks like the simultaneous administration did not really improve outcomes. We now know that simultaneously giving them another concurrent radiation should really no longer be pursued in clinical trials for this patient population. Can you share with our audience what strategies are being studied in this setting and what trials to watch out for in the future?

Dr. Jeffrey Bradley: Sure, I think when you add concurrent radiation to immunotherapy, there were more central tumors in this trial, I think you're killing lymphocytes and negating the effect of immunotherapy. So I think that's the smoking gun for this trial, for the ECOG trial, for the small cell trial that NRG reported, LU005, and other trials. So correct, I don't think there's any need to continue to pursue concurrent immunotherapy in this space of lung cancer.

But that's not to say there aren't many other trials that are either ongoing, have accrued and awaiting results, or being planned for the next phase of clinical trials. We have a trial within NRG Oncology called NRG-LU008. It's a randomized phase III trial that is using an SBRT boost to a peripheral primary and chemoradiation to the nodes, because the primary tumor is the one that fails more often than the lymph nodes, and that's compared to PACIFIC in the control arm.

PACIFIC-9 is another trial in the same line as the other PACIFIC trials. That one is using dual checkpoint inhibition versus the control arm being PACIFIC. So there are three arms in that trial, durva and oleclumab, durva and monalizumab versus the PACIFIC arm. And that trial is completed accrual, but we have no results from that study yet.

Johnson & Johnson has a trial open looking at a nanoparticle. That's a radiosensitizer where bronchoscopy is used to inject the primary tumor and the lymph nodes with a radiosensitizer. That's a randomized phase ll trial that's ongoing. It's got three arms, two different doses of this radiosensitizing drug and then a control arm without injection at all. The control arm is again the PACIFIC arm.

And then those of us within the NCI-based clinical trials evaluation program, CTEP, are proposing an intergroup trial that would compare induction chemo-immunotherapy followed by chemoradiation followed by maintenance immunotherapy versus PACIFIC in a phase III study. So I think there's other trials that are either completed, ongoing completed, or on the horizon to assess in this patient population.

Dr. Ece Cali: Yeah, we definitely have an unmet need to improve survival outcomes for stage III patients, and it's great to hear that there are so many efforts looking at different strategies to improve outcomes for these patients.

Thank you so much, Dr. Bradley, for this informative discussion and for sharing your insights. Any last thoughts?

Dr. Jeffrey Bradley: Yeah, we need something, you know. PACIFIC was first reported in 2017, and we really haven't made progress in terms of changing that standard of care control for the last eight years. So we need progress in this area.

Dr. Ece Cali: Yep, definitely. Thank you so much for joining, Dr. Bradley.

And thank you for listening to JCO Article Insights. Please come back for more interviews and article summaries and be sure to leave us a rating and review so others can find our show. For more podcasts and episodes from ASCO, please visit asco.org/podcasts.

The purpose of this podcast is to educate and to inform. This is not a substitute for professional medical care and is not intended for use in the diagnosis or treatment of individual conditions.

Guests on this podcast express their own opinions, experience, and conclusions. Guest statements on the podcast do not express the opinions of ASCO. The mention of any product, service, organization, activity, or therapy should not be construed as an ASCO endorsement.

DISCLOSURES

Dr. Bradley Honoria: Mevion Medical Systems, Inc. Consulting or Advisory Role: Varian, Inc, Genentech, Inc. Research Funding: Varian Medical Systems

Dr. Cali Research Funding Company: BeiGene, Nuvalent, Inc., Astra Zeneca

In this episode of JCO Article Insights, host Dr. Lauren Shih summarizes the article, "Xevinapant or Placebo Plus Platinum-Based Chemoradiotherapy in Unresected Locally Advanced Squamous Cell Carcinoma of the Head and Neck (TrilynX): A Randomized, Phase III Study" by Bourhis, et al published September 03, 2025

TRANSCRIPT

In this JCO Article Insights episode, Dr. Ece Cal interviews Dr. Martin Wermke, author of the JCO article, "Phase I Dose-Escalation Results for the Delta-Like Ligand 3/CD3 IgG-Like T-Cell Engager Obrixtamig (BI 764532) in Patients With Delta-Like Ligand 3+ Small Cell Lung Cancer or Neuroendocrine Carcinomas."

TRANSCRIPT

The disclosures for guests on this podcast can be found in the transcript.

Dr. Ece Cali: Welcome to this episode of JCO Article Insights. This is Dr. Ece Cali, JCO editorial fellow, and today I am joined by Dr. Martin Wermke, Professor for Experimental Cancer Therapy at Dresden University of Technology, to discuss the manuscript "Phase 1 Dose-Escalation Results for the Delta-Like Ligand 3/CD3 IgG-like T-Cell Engager Obrixtamig in Patients with DLL3+ Small Cell Lung Cancer or Neuroendocrine Carcinomas."

Obrixtamig is a bispecific T-cell engager that binds to DLL3 on tumor cells and CD3 on T-cells. This manuscript presents the phase 1A dose escalation results of Obrixtamig in patients with DLL3+ small cell lung cancer and neuroendocrine carcinomas. In this study, 168 patients were treated with Obrixtamig across four different dosing regimens. 49% of the patients had small cell lung cancer, 42% had extrapulmonary neuroendocrine carcinoma, and 8% had large cell neuroendocrine carcinoma of the lung. Patients received a median of two prior lines of therapy. 33% of the patients had brain metastases at baseline. Of note, this trial did not mandate baseline brain imaging. Maximum tolerated dose was not reached. 88% of the patients experienced a treatment-related adverse event, however, only 3.6% of the patients had to discontinue treatment due to treatment-related AEs, and dose reduction due to treatment-related AEs was documented in 2.4% of the patient population. Similar to the other DLL3-targeted bi-therapies, the most common adverse events included CRS in 57%, dysgeusia in 23%, and pyrexia in 21% of the patients. CRS events were mostly mild. They occurred more frequently in the first two to three doses. 9% of the patients experienced ICANS, of which 3% were graded as Grade 3 or higher.

And let's review the efficacy results. Responses were only seen in patients who received 90 microgram per kg or more once weekly or once every three weeks dosing. The objective response rate in patients who received an effective dose was 28%. If we review by tumor type, 21% of the small cell lung cancer patients, 27% of the extrapulmonary neuroendocrine carcinoma patients, and 70% of the large cell neuroendocrine carcinoma patients had objective response. Median duration of response was 8.5 months, though this data is immature due to short follow-up.

Dr. Wermke, DLL3-targeted bispecific T-cell engagers are reshaping the treatment landscape of small cell lung cancer. This trial investigates Obrixtamig in other high-grade neuroendocrine tumors as well. Can you put this trial into context for us and explain why it may represent an important step forward?

Dr. Martin Wermke: Yeah, thank you for providing me with the opportunity to discuss our data today. I think the data with Obrixtamig in small cell lung cancer are largely similar to what has been observed with other bispecific T-cell engagers such as tarlatamab with respect to the response rate and duration. It has, however, been to be mentioned that BI 1438001 had a bit more liberal inclusion criteria than other trials around. You already mentioned the fact that we allowed the inclusion of patients without mandatory brain imaging, which led to some patients having their brain mets been diagnosed during the treatment with obrixtamig and then adding to the progressive disease patients. That is something which was not the case with the tarlatamab trials where you really had to have a brain imaging before, and in the Phase 1 trial you were even required to treat the brain mets before you included the patient. So it is a bit different, more poorest patient population.

I think the trial adds on existing data by being the first trial to also include non-SCLC neuroendocrine carcinoma of other origin, for example from the gastrointestinal tract, and also by including large cell neuroendocrine carcinoma of the lung, which is a really hard to treat pulmonary neoplasm which currently lacks any standardized treatment. So that is really a step forward which we will build on in the future.

Dr. Ece Cali: And one thing I would note in this trial, only patients with tumor expressing DLL3 were enrolled. Can you tell us a little bit more about this target, DLL3 in the context of neuroendocrine tumors, and does DLL3 expression predict clinical outcomes after treatment with DLL3 BiTEs, or do we actually need other predictive biomarkers for these novel agents?

Dr. Martin Wermke: Yeah, thank you. That's a pretty interesting question. First of all, DLL3 is an atypical notch ligand, which is expressed by the majority of neuroendocrine carcinomas, virtually absent on healthy adult tissues. Therefore, turning it really into a bona fide target for T-cell engaging therapies, pretty low risk for on-target off-tumor side effects. We found that in all the patients we screened, we had an expression rate of about 94% in small cell lung cancer, 80% of large cell neuroendocrine carcinoma of the lung were positive, and also about 80% of the extrapulmonary neuroendocrine carcinoma. So it's really a high prevalence. So the fact that we only included DLL3+ tumors still means we included most of the patients that presented with these diseases.

I think at the moment there are no data suggesting a clear-cut association between DLL3 expression levels and outcome on DLL3 CD3 T-cell engagers. There's also not a lot published. If you want to find this out for tarlatamab, you have to look into their patent to really see the data, but it's not clear-cut and I'm sure we need other markers to complement that. And I think what probably plays a major role is intrinsic T-cell fitness. So the question how really diseased your T-cells are, how old you are, because age also correlates with the fitness of the immune system, and other patient characteristics such as tumor burden, we've seen all across the board that the higher the tumor burden, the lower the rate of prolonged response is in such trials. And I also think we need to focus on other components of the tumor microenvironment. So see how high the T-cell infiltration with obrixtamig is and how abundant suppressive elements like regulatory T-cells or myeloid-derived suppressive cells are. That is work which is currently being done. Data are emerging, but I don't think that at the moment we have any clear biomarker helping us to select who should not receive DLL3 T-cell engagers.

Dr. Ece Cali: Those are great points and there is a lot we need to learn about how to use these novel agents in the future.

I'd like to highlight the results in large cell neuroendocrine carcinoma of the lung. The response rate in this group was remarkably high at 70%. Though we should note the small sample size of only 14 patients in this trial. After first line chemoimmunotherapy, current approved options for this population have very modest clinical activity. Given these trial results, how do you envision the field moving forward for patients with large cell neuroendocrine carcinoma?

Dr. Martin Wermke: Yeah, I think LCNEC is really an area which urgently needs further improvement of therapeutic standards. At the moment, as I said, there is no real standard. We are usually extrapolating from results we have in small cell lung cancer or non-small cell lung cancer, but I don't think we have too many prospective trials really informing this. Of course, 14 patients is a small sample size, but I think it's still fair to say that we can claim that DLL3 T-cell engagers are not doing worse in LCNEC than they do in SCLC. And that's why I think we really need to move forward clinical trials that are specifically targeting this population. Although I fear a bit that, given the rareness of this disease and the aggressiveness of its phenotype, that this is probably not the main focus of the pharmaceutical industry. So I think it's up to us academic investigators to really come up with investigator-initiated trials trying to fill the knowledge gaps we have here.

Dr. Ece Cali: And one more thing that I want to talk about is the accessibility for these drugs. These novel agents are showing real promise in improving outcomes for patients with high-grade neuroendocrine tumors, an area where progress has been limited until very recently. However, as DLL3 BiTEs become more widely used, issues of logistics and access come into sharper focus. With unique toxicities and the specialized monitoring, their use is restricted to certain centers. Looking ahead, what kinds of strategies could help mitigate some of these adverse events or make these treatments more broadly available?

Dr. Martin Wermke: Yeah, I think if you look at countries like the United States where tarlatamab has already been approved, we can see how the management strategies are evolving. I've heard about a colleague equipping their patients with thermometers and a pill of Dexamethasone, alongside with a temperature control protocol and clearly instructing them, "If you measure a temperature above a certain level then start taking the Dexamethasone and come back to our office and we're going to take care of you." I think that's one way to move forward.

I think we are lucky in a way that CRS usually manifests within the first 24 hours. This was the same in our study, like in the tarlatamab studies. So we really know when the time of trouble is for our patients. And in this time, I think we need to instruct the patients to stay close to the hospital. I don't think we need to hospitalize all of them, but we probably need them to stay in a nearby hotel to be able to reach the emergency room if needed in a short period of time.

And I think we can also learn in this strategy how to manage bispecific antibodies from the experience our colleagues in hematology had because they have been using bispecific T-cell engagers for quite some years right now and they developed strategies and networks that were able to successfully treat these patients also on an outpatient basis. And I think that is clearly an experience we need to follow, acknowledging that we are talking about diseases which are much more frequent than the standard hematology indications.

Dr. Ece Cali: Thank you so much, Dr. Wermke, for this informative discussion and for sharing your perspective on this evolving field.

Dr. Martin Wermke: Yeah, thank you for providing me with the opportunity to talk about data. It was really great being able to share that, and I really think that we are just at the beginning of a new exciting area for the treatment of neuroendocrine carcinomas, and I think much improvement is yet to come for our patients.

Dr. Ece Cali: Yes, that's really exciting.

And thank you everyone for listening to JCO Article Insights. Please come back for more interviews and article summaries and be sure to leave us a rating and review so others can find our show. For more podcasts and episodes from ASCO, please visit asco.org/podcasts.

The purpose of this podcast is to educate and to inform. This is not a substitute for professional medical care and is not intended for use in the diagnosis or treatment of individual conditions.

Guests on this podcast express their own opinions, experience, and conclusions. Guest statements on this podcast do not express the opinions of ASCO. The mention of any product, service, organization, activity, or therapy should not be construed as an ASCO endorsement.

Dr. Martin Wermke's Disclosures

Honoraria: Lilly, Boehringer Ingelheim, SYNLAB, Janssen, Merck Serono, GWT, Amgen, Novartis, Pfizer, BMS GmbH & Co. KG, Regeneron, MJH/PER, Takeda

Consulting or Advisory Role: Bristol-Myers Squib, Novartis, Lilly, Boehringer Ingelheim, ISA Pharmaceuticals, Amgen, immatics, Bayer, ImCheck therapeutics, AstraZeneca, Tacalyx, Regeneron, Daiichi Sankyo Europe GmbH, Zymeworks, PharmaMar, Iovance Biotherapeutics, T-Knife, Genentech

Research Funding: Roche

Patents, Royalties, Other Intellectual Property

Travel, Accommodations, Expenses: Pfizer, Bristol-Myers Squibb, AstraZeneca, Amgen, GEMoaB, Sanofi/Aventis, immatics, Merck Serono, Janssen Oncology, Iovance Biotherapeutics, Daiichi Sankyo Europe GmbH"

JCO fellow Dr. Ece Cali speaks with JCO Associate Editor Dr. Thomas E. Stinchcombe to discuss the JCO article "Phase 2 Dose-Randomized Study of Sunvozertinib in Platinum-Pretreated Non-Small-Cell Lung Cancer with Epidermal Growth Factor Receptor Exon 20 Insertion Mutations (WU-KONG1B)", that was simultaneously released at the IASLC 2025 World Conference on Lung Cancer.

TRANSCRIPT

Dr. Ece Cali: Hello, and welcome to our series where we cover some of the top JCO papers published simultaneously with their abstract presentation at this year's most important oncology meetings. I am your host, Dr. Ece Cali, JCO editorial fellow, and I am joined by Dr. Tom Stinchcombe, JCO associate editor, to discuss the Journal of Clinical Oncology article and 2025 World Conference on Lung Cancer abstract presentation, "Phase II Dose-Randomized Study of Sunvozertinib in Platinum-Pretreated Non–Small Cell Lung Cancer With EGFR Exon 20 Insertion Mutations."

The WU-KONG1B trial is a multinational, phase II study that investigated the efficacy and safety of different doses of sunvozertinib in patients with metastatic non-small cell lung cancer and EGFR exon 20 insertion mutations after progression on platinum based chemotherapy. Tom, before we dive into the results, could you walk us through the rationale for this study, and how does it fit into the current treatment options for patients with EGFR exon 20 insertion?

Dr. Tom Stinchcombe: Thank you, Dr. Cali. I think the clinical context is always important. We have known that EGFR exon 20 insertions exist and that they are resistant to our currently available EGFR tyrosine kinase inhibitors, and I think there have been attempts in the past to develop a tyrosine kinase inhibitor, but there is a very narrow therapeutic window between the dose you need to inhibit the EGFR mutation in the cancer and the EGFR receptor on normal tissues, most notably the mucosa, the gut, and the skin. And so, our previous attempts have failed largely because the dose required was not tolerable for patients and they could not really stay on the drug for a long time or they were not very active.

And so, I think there was a real desire to develop an EGFR tyrosine kinase inhibitor, and then, historically, the standard had been a platinum based doublet as the standard of care. And more recently, platinum based doublet with amivantamab has proven to be superior to platinum based chemotherapy alone. I think the context is also important that amivantamab is not necessarily available in all the countries, and so, there are patients who do not have access to amivantamab. Going to the rationale, I think that this drug had shown preliminary promise of having activity but without that being encumbered by those EGFR wild type toxicities, and, therefore, it was really explored in this larger study.

Dr. Ece Cali: And what are some key findings from this trial?

Dr. Tom Stinchcombe: So, I think that we should look at the study design. It is a little quirky, for lack of a better term, in that there is a randomization to 200 versus 300 mg, and then, there was a nonrandomized cohort of 300 mg. So, when you look at the study, if you are a purist, you will just look at the randomized patients. If you are sort of an aggregator, you look at all patients. So, it shows reporting on three cohorts, but I think the key findings are that the 200 mg and the 300 mg treatments had similar toxicities in terms of response rate, duration of response, and progression free survival. And as you know going through the review, there was a lot of queries from the reviewers as to which would be the preferred dose, and to me, I think this really illustrates a dose finding component to a trial design because there is a lot of debate about what the minimal effective dose is or the optimal dose. And in this case, having the two dose cohorts did provide us some valuable efficacy and toxicity information. And then, when I look at the study, I want to make sure it reflects my patient population, and about a quarter of patients had brain metastases, and about 15% had previous amivantamab, and about 5% to 10% had another EGFR tyrosine kinase inhibitor.

Dr. Ece Cali: And what is the objective response rate and the duration of response? These are pretty good numbers for this patient population.

Dr. Tom Stinchcombe: In the 200 mg cohort, it was about 46%. The duration of response was around 11 months, and the PFS was around 8 months. The 300 mg cohort was 46%, duration of response 9.8, and the median PFS is 6.9 months, and I think that this is greater activity than we have seen with our previous attempts at EGFR tyrosine kinase inhibitors.

Dr. Ece Cali: And based on these data, FDA granted accelerated approval for sunvozertinib very recently at 200 mg once daily dosing in this setting. So, that is a major step forward for our patients. Dr. Stinchcombe, how does this impact your clinical practice, and what side effects should oncologists be watching for if they prescribe this medication?

Dr. Tom Stinchcombe: So, I think it was very interesting that they chose the 200 mg dose, which I think was more tolerable, and when we kind of look at this, there still was a rate of diarrhea, all grade, rash, paronychia, which are the EGFR related toxicities. There can be some decreased appetite, stomatitis, and then, it can lead to some lab abnormalities, like increased CPK and creatinine that physicians have to be aware of.

You know, how it will affect my practice is that all these patients had received a platinum based chemotherapy as the first line therapy. I think that this would become my preferred second line therapy for patients outside the context of a trial because of the activity and the tolerability.

Dr. Ece Cali: And lastly, several other tyrosine kinase inhibitors are being evaluated for EGFR exon 20 insertion, including in the frontline setting. So, what are some of the outstanding questions in this space, and what data should our listeners keep an eye on moving forward?

Dr. Tom Stinchcombe: I think you are right that now, there is going to be another EGFR tyrosine kinase that may become available in the next year, and there is another drug, furmonertinib, that is being investigated.

I think, for the clinical question, is, well, can we move these into the first line setting? And actually, the development path has two ways of doing this. There is EGFR tyrosine kinase compared to platinum based chemotherapy, and then, platinum based chemotherapy with an EGFR tyrosine kinase versus platinum based chemotherapy, and both have their merits and strengths. And so, I think it is going to be very interesting as we see if those first line trials, one, can they be demonstrated to be superior to platinum based chemotherapy, and then by what magnitude and what the side effects are. But I think we are hoping that in the next couple of years, we will have an additional first line option for our patients.

Dr. Ece Cali: Yeah, it is always great to have more options for our patients.

Thank you, Dr. Stinchcombe, for speaking about the JCO article, "Phase II Dose-Randomized Study of Sunvozertinib in Platinum-Pretreated Non-Small Cell Lung Cancer With EGFR Exon 20 Insertion Mutations."

Join us again for the latest JCO simultaneous publications. Please take a moment to rate, review, and subscribe to all ASCO podcast shows at asco.org/podcasts. Until then, enjoy the rest of World Lung Conference.

The purpose of this podcast is to educate and to inform. This is not a substitute for professional medical care and is not intended for use in the diagnosis or treatment of individual conditions.

Guests on this podcast express their own opinions, experience, and conclusions. Guest statements on the podcast do not express the opinions of ASCO. The mention of any product, service, organization, activity, or therapy should not be construed as an ASCO endorsement.