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EARNINGS CALL TRANSCRIPT
EARNINGS CALL TRANSCRIPT 2020 - Q1
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Operator

Good day, ladies and gentlemen, and welcome to the TRACON Pharmaceuticals First Quarter 2020 Earnings Conference Call.

[Operator Instructions] During today's call, we will be making certain forward-looking statements, including statements regarding expected timing of clinical trials and results, regulatory activities, future expenses and cash runway and our development plans and strategy.

These statements are subject to various risks that are described in our filings made with the Securities and Exchange Commission, including our annual report on Form 10-K for the year ended December 31, 2019, and subsequent quarterly reports on Form 10-Q.

You are cautioned not to place undue reliance on these forward-looking statements, and we disclaim any obligation to update such statements. Now I would like to turn the call over to Dr. Charles Theuer, President and CEO of TRACON Pharmaceuticals. Dr.

Theuer?.

Charles Theuer

Good afternoon and thank you for joining TRACON’s first quarter 2020 financial results and business update conference call. I will begin with an update on our pipeline and recent activities. Following that, our Chief Accounting Officer, Scott Brown will review our financial results for the three months ended March 31, 2020.

Finally, we will conclude by taking your questions. Our primary focus is on our recently in-licensed PD-L1 product candidate Envafolimab, a late-stage potential best-in-class checkpoint inhibitor by virtue of its subcutaneous route of administration. We expect to begin enrollment in a pivotal study in sarcoma in the second half of this year.

While envafolimab is our lead product candidate, we also anticipate significant milestones related to our three other clinical stage assets in the near-term. Let's begin with a review of our recent meeting with the U.S.

FDA last week, where we reviewed and discussed our plans for the pivotal Phase 2 ENVASARC trial of envafolimab for the treatment of sarcoma. As a result of our May 8, Type B meeting with the U.S.

FDA, we expect to initiate the ENVASARC pivotal trial in the sarcoma’s subtypes of undifferentiated pleomorphic sarcoma or UPS, and the closely related subtype of myxofibrosarcoma or MFS.

This trial will include one cohort of approximately 80 patients, who will receive single agent envafolimab and a second cohort of approximately 80 patients, who will receive envafolimab in combination with Yervoy, a second checkpoint inhibitor targeting the CTLA-4 receptor that is marketed by BMS.

The trial enrolled patients with UPS and MFS, who have progressed on a single line of treatment and who have not received prior checkpoint inhibitor therapy. The primary endpoint in each of the cohorts will be objective response rate by resist by blinded independent central review, with duration of response being a key secondary endpoint.

Each cohort will target a 15% response rate and the trial is designed to detect a response rate that statistically excludes the known 4% response rate of Votrient, the only approved treatment for refractory sarcoma that includes UPS and MFS.

Yes, you heard me correctly and it is disappointing to report that the only approved treatment for refractory UPS and MFS has a 4% objective response rate. This is a clear statement as to the high unmet need. We believe targeting a 15% response rate in UPS and MFS is reasonable, as Keytruda’s Phase 2 trial in UPS demonstrated a 23% response rate.

Furthermore, checkpoint inhibition with a combination of Opdivo and Yervoy more than doubled the Opdivo response rate in unselected sarcomas. Dual checkpoint inhibition may therefore result in a higher response rate as well as deeper and more durable responses than single agent envafolimab treatment.

Success in both cohorts could allow approval of envafolimab as a single agent in combination with Yervoy. Pardon me, success in both cohorts could allow approval of envafolimab as a single agent and in combination with Yervoy, which would allow physicians to determine which patients are best served by single agent or combination therapy.

The dual arm design also provides for risk-mitigation, should combination treatment be required for robust responses.

Notably, BMS executed a similar dual cohort clinical strategy for Opdivo and MSI high tumors that resulted in Opdivo's approval as both a single agent and in combination with Yervoy based on objective response rate in MSI high cancers.

Not surprisingly, key opinion leaders and investigators are very enthusiastic about initiating the ENVASARC trial, based on addressing an unmet need and the convenience of subcutaneous dosing. We expect to open the study at approximately 20 sites in the U.S.

Also of note, is that the expected total cost of the ENVASARC trial using our CRO independent product development platform including paying for the Yervoy is approximately $15 million that will be spent over the next two to three years.

We recently filed envafolimab for orphan drug designation in sarcoma and now that the FDA meeting has been completed, we expect to file an IND that will cross-reference the existing open IND for envafolimab maintained by our partner 3D Medicines and initiate dosing in the ENVASARC trial in the second half of this year.

Our partner 3D Medicines is conducting clinical trials in the U.S. and China. And in the near future, we expect them to file envafolimab for approval in China. We also look forward to our partner’s clinical data presentation at ASCO.

The ASCO presentation is abstract 3021 and it's entitled quote Envafolimab in Advanced Tumors with Mismatch Repair-Deficiency and will be part of the immunotherapy developmental therapeutic session.

The abstract contexts are expected to be released by ASCO later today and we expect to highlight the abstract contents in a press release tomorrow morning.

Our expected timeline for the ENVASARC trial continues to include an interim response assessment in 2021, a final response assessment in 2022 and assuming positive data submitting a BLA for accelerated approval, that if approved would allow for a product launch in the U.S. in 2023.

Additionally, positive data from the initial sarcoma refractory UPS and MFS could lead to an additional new clinical trial and testing in other sarcoma patient populations.

This could be accomplished by initiating a randomized trial of envafolimab as a single agent or combined with Yervoy for another approved cancer therapy for multiple soft tissue sarcoma subtypes.

This trial could also include biomarker directed enrollment, based on biomarker analysis that will be conducted as part of the initial ENVASARC trial in refractor UPS and MFS. We estimate the checkpoint inhibitor market for UPS and MFS could generate annual revenue of nearly $200 million in the U.S. assuming parody pricing to Keytruda or Opdivo.

Of course revenue could increase, if treatment is expanded into other sarcomas subtypes. We'll turn now to TRC102, our second clinical stage asset which is a novel small molecule inhibitor of the DNA-based excision repair pathway that is intended to reverse resistance to certain chemotherapeutics.

The NCI is supporting 4 Phase 1 or Phase 2 trials that are focused on patients with mesothelioma or non-small cell lung cancer. In addition, our academic collaborators continue to evaluate biomarkers and tumor specimens from glioblastoma patients treated in a completed Phase 2 trial and in tumor specimens from patients in ongoing TRC102 trials.

With the goal of identifying a protein or gene expression profile that correlates with clinical response. Data from multiple TRC102 clinical trials will be presented at ASCO. Dr.

Biswas of Case Comprehensive Cancer Center will present Phase 1 data of TRC102 in combination with chemo radiation for locally advanced non-squamous non small cell lung cancer. Dr.

Koczywas of City of Hope Medical Center will present Phase 1 data for TOC102 in combination with cisplatin and pemetrexed in patients with advanced solid tumors and Phase 2 data for TRC102 in combination with pemetrexed in patients with mesothelioma refractory to pemetrexed and platinum therapy.

We hope these clinical trial data provide the impetus for the NCI to enroll a new trial of an enriched population of patients who may be both likely to respond to treatment. We'll now move on to TRC253, our third clinical stage asset.

We recently announced that we retain global rights for the development and commercialization of TRC253 following Janssen's decision not to exercise this option. While the product candidate was not highly active in prostate cancer patients with acquired resistance to Xtandi.

TRC253 is as active as Xtandi in prostate cancer cell lines and in patient-derived xenograft models. Given these preclinical data indicating TRC253 may be as active as Xtandi in an earlier line setting.

We expect the product candidate can be developed and commercialized successfully in countries where prostate cancer patients generally do not have – generally do not yet have access to Xtandi. We have therefore initiated an out-licensing process to identify a corporate partner to develop and commercialize TRC253.

Notably, we have established three corporate partnerships in China over the past three years, as developed significant relations with Chinese pharmaceutical and biotechnology companies that we hope to leverage to quickly identify a partner.

Our fourth clinical stage asset is the CD73 antibody, TJ4309, also known as TJD5 that is in a Phase I dose escalation study as a single agent and in combination with Tecentriq, a marketed checkpoint inhibitor being supplied by Roche.

We are developing TJ4309 in collaboration with I-Mab Biopharma through our first agreement with them, and we anticipate completing dose escalation and presenting top line data from this Phase I trial in the second half of 2020. In this collaboration, TRACON is responsible for the regulatory and clinical development of TJ4309 in the U.S. and Europe.

And TRACON is entitled to receive escalating portions of non-royalty and royalty payments if I-Mab elects to out-license TJ4309 to a third party in any region outside of China, Macau, or Taiwan. In March 2020, I-Mab issued a press release announcing a strategic partnership with Kalbe Genexine Biologics or KG Bio.

Where by KG Bio received what the press release described as a right of first negotiation for exclusive rights, its commercialized TJ4309 in multiple Asian, African and Middle Eastern countries; for up to $340 million in potential payments to I-Mab.

We believe that based on the KG Bio transaction, TRACON may be entitled to receive a payment under the TJ4309 agreements. Although I-Mab has disputed that any payment is due. On April 8th we issued a notice of dispute regarding the TJ4309 agreement we signed with I-Mab in November 2018. As of today, that dispute has not yet been resolved.

We will continue to fulfill our obligations under the TJ4309 agreements. As you know, our second agreement with I-Mab is a multiproduct collaboration to develop up to five of I-Mab’s bispecific antibodies in North America.

Pursuant to the bispecific agreement, TRACON and I-Mab mutually select through a joint steering committee up to five of I-Mab’s specific antibody product within a five year period for development and commercialization in North America.

TRACON shares the North American rights of any selected bispecific antibodies with I-Mab for each collaborative program, and TRACON has often rights to enlicense the bispecific antibodies from I-Mab in certain territories. In March 2020, we learned that I-Mab entered into two licensing collaboration agreements with ABL Bio in July 2018.

On April 8th, we issued a notice of dispute regarding possible breach of the bispecific agreement we signed with I-Mab in November of 2018. As of today, this dispute has not been resolved and we cannot provide a timeline as to when or if we will file an IND for bispecific antibody under the bispecific agreement.

Our capital resources are expected to be sufficient to fund our currently planned operations into the first quarter of 2021.

Furthermore, we amended our agreement with Aspire Capital, under which they're committed to purchase up to $15 million of our common stock at our request from time to time during a 30 month period at prices based on the market price at the time of each sale.

The amendment reset the base price for calculating shares sold at or above the market price, which makes facilitate fully utilizing the equity line, if we elect to do so. If fully utilized, we estimate this facility would extend our crash runway into late three quarter 2021.

Importantly, our financial run rate could further be extended for use of our ATM or shelf registration statement or through non-dilutive capital from the license of rights at TRC253 or success based milestones through our TJ4309 partnership with I-Mab. At this time, Scott will provide an update on our financials..

Scott Brown Chief Financial Officer

Thank you Charles and good afternoon everyone. Research and development expenses were $2 million for the first quarter of 2020 compared to $5.2 million for the comparable period of 2019.

The decrease was primarily attributable to lower manufacturing and clinical trial expenses related to the termination of the TRC105 program in April of last year along with lower manufacturing expenses for TRC253. General and administrative expenses were $1.9 million for the first quarter of 2020 and 2019.

Our net loss was $4 million for the first quarter of 2020, compared to $7.2 million for the comparable period of 2019. Turning to the balance sheet. At March 31, 2020, our cash and cash equivalents totaled $14.1 million compared to $16.4 million at December 31, 2019.

As Charles said, we expect our current capital resources to be sufficient to fund our planned operations into the first quarter of 2021, which may be further extended through use of the equity line with the Aspire Capital. With that, I will turn the call back over to Charles..

Charles Theuer

Thank you, Scott. To recap, we are pleased the FDA agreed with the ENVASARC pivotal trial design and endpoints as we believe it to be a fast to market opportunity to provide envafolimab or sarcoma patients in need of a new therapy as expeditiously as possible.

This is also important to investigators who are very enthusiastic about initiating the ENVASARC trial. Envafolimab solves for our quest to license an exciting late-stage asset and repositions the company to forward integrate and potentially build our commercial capabilities, which we eventually intend to leverage across multiple products over time.

We expect to deliver multiple potential value creating envafolimab milestones in the next few months, including filing the envafolimab IND, receiving orphan drug designation, and importantly dosing the ENVASARC pivotal trial in sarcoma.

We also expect our partners 3D Medicines and Alphamab Oncology to file envafolimab for approval in China and MSI high cancer and present envafolimab clinical trial data in MSI high cancer at ASCO including abstract contexts that we expect to highlight in a press release tomorrow.

We look forward to providing further updates in the coming months and remain confident that we have the right strategy in place to deliver on our development and business plans for the benefit of patients and shareholders. Thank you for your time and attention and we were available to answer your questions..

Operator

Thank you, sir. [Operator Instructions] I show our first question comes from Maury Raycroft from Jefferies. Please go ahead..

Maury Raycroft

Hi. Hi, Charles. Thanks for taking my questions. First one is just on enva, I was wondering if enva does not hit your expected 15% overall response rate in the combo with Yervoy.

And it produces results that are close to the – the double agent produces results that are close to the SARC 028 study with pembro in the mid-20% range and six months durability? I guess, would that be sufficient for approval or do you think there's risk, you might have to run another study with Yervoy alone? I guess what's the best reference out there for the combo arm?.

Charles Theuer

Yes. It's a great point, Maury. So the reason for the combo arm really is the current Alliance trial, which showed that Opdivo single-agent activity in all sarcoma to be clear, not just UPS was only 5%, but the combination of Opdivo and Yervoy in all sarcoma was 16%, which is, it's fairly remarkable.

So if we were to have a trial, whereby, the doublet of envafolimab and Yervoy achieved a 20% to 30% response rare, just think what that would mean to patients who currently have a standard of care with a 4% response rate that would clearly meet the endpoint of the trial and we would suspect that would be sufficient for approval.

The reason I say that is, Yervoy is a single agent, has been studied in sarcoma. In fact, there are three separate published studies for Yervoy as a single agent. And in each case it was highly ineffective, meaning almost no response rate whatsoever.

So I think the whole community in sarcoma is pretty confident that Yervoy, [indiscernible] as a single agent, is much – is ineffective in sarcoma and for instance, much less active than single agent PD-1 or PD-L1.

So in response to your question, we hope that we see the response rates that would allow approval as a single agent based on say 15% response rate and also the combination of Yervoy and envafolimab based on potentially a 30% response rate that gives the physicians the most options in treating their patients.

But if we see that the combination is really what's needed for significant activity, we would be very pleased. That would mean a huge advance in the standard of care for patients with refractory UPS and MFS.

It would set up the stage for additional studies of that combination of their subtypes, even potentially in the first-line setting, because remember Maury, in the first-line sarcoma doxorubicin’s response rates about 17%.

So that's why we can see its response rate, with that combination in the 20% to 30% maybe 40% range that literally would be a revolutionary treatment for sarcoma patients..

Maury Raycroft

Got it. That's helpful. And so for the pembro data from SARC 028, it's probably an outlier.

Is that kind of what you're thinking in that respect then?.

Charles Theuer

Yes. So it's interesting. Yes. That there are other studies of single agent PD, PD-L1s in UPS, the highest response rate clearly was the pembro data in SARC 028.

So I'm not sure it's an outlier, but I do think that the real response rate could be closer for this class of agents in the 15% to 20% range, Maury, and I think we'll see more data forthcoming, for instance from the Alliance trial that will have updated data potentially even at ASCO this year.

So in the range I'd say of 10% to 20%, I think that's what you potentially could expect with PD-1, PD-1 therapies, the single agents and UPS, and then in the range potentially double that, you expect for the combination with Yervoy again based on the Alliance data, whereas by nivo double the response rate of single-agent nivo across all sarcoma subtypes..

Maury Raycroft

Got it. Okay. That's helpful.

And then I wanted to ask on I-Mab relationship, just if you can comment on ongoing dialogue and if agreements are breached, are there break-up fees involved that I-Mab would owe to TRACON and if you can just provide any more perspective on the relationship? I think that would helpful?.

Charles Theuer

Yes. And I appreciate the question, Maury. Again, there are two dispute notices ongoing at this time and given that consideration we won't provide for the commentary beyond what I disclosed in the earnings call was disclosed in our current 10-Q and what's disclosed in the current press release.

I would reiterate though that we remain diligent with respect to running the TJ4309 trial and we have enjoyed working with I-Mab on that trial, and we'll continue to work and move that trial forward expeditiously..

Maury Raycroft

Got it. Okay. And then last question also related to I-Mab, just with the study that they announced that they started in China.

I was wondering if those are going to be similar patient types like, like you're pursuing and if you can just comment on expectations for whether the data that you report later this year, whether that would be at a medical conference or in a press release, maybe anything additional on how much data we should expect with that?.

Charles Theuer

Right. Yes. No, we're encouraged to see I-Mab begin their own study of TJ4309 in China that would complement our current investigations.

But with respect to data release, I think either as possible, Maury, I think at this point, I would lean more toward a top line data release with respect to completing the dose escalation, which we're well on track to do by end of this year..

Maury Raycroft

Got it. Okay. Thanks, and I'll hop back in the queue..

Charles Theuer

Thanks, Marty. Always a pleasure..

Operator

Thank you. Our next question comes from Ed White from H.C. Wainwright. Please go ahead..

Ed White

Hi, Charles, thanks for taking my question..

Charles Theuer

Hi, Ed..

Ed White

Hi. So just a couple of things. On the 253 in China, you had mentioned any discussions there.

Is – do you have any thoughts on, if we can see a deal being inked this year or and are things being slowed down really because of the pandemic as far as getting a deal done in China?.

Charles Theuer

Yes. Great question. I think respect to our TRC253, the great advantage we have is that we have spent so much time in China over the past two years as a result of our current partnerships with I-Mab, with 3D Medicines and with Alphamab Oncology.

So while we've engaged with partners, we've also met – I'd say on the course of 15 to 20 additional pharma companies or biotech companies in China that we can turn to with potential interest in TRC253.

So once that relation is established, I think we can leverage that and it's hard to promise anything on deal timing, but we are engaging in a process to engage many companies in China around interest in TRC253 and that is a priority in terms of business development this year.

And we do feel it's something that because of our existing relationships we can manage through the COVID-19 situation..

Ed White

Okay. Great. Thanks Charles. And then just the financial question as far as the Aspire goes you had $14.2 million out of the $15 million left in the agreement at the end of the first quarter. Has anything been done in the – between the end of the first quarter and now as far as shares being sold? Thanks..

Scott Brown Chief Financial Officer

Sure. No. Yes, the $14.2 million remains to be exercised at our option and between the end of the quarter now; we have not yet exercised any additional share puts to Aspire..

Ed White

Okay. Thanks both..

Charles Theuer

Thank you, Ed..

Operator

Thank you. Our next question comes from Jim Molloy from Alliance Global Partners. Please go ahead..

Jim Molloy

Hey Charles, thanks for taking my question. I had a question following up on, on Ed's, on, on the pandemic issues, and your thoughts on any potential impacts in the U.S.

and a number of companies have had to delay trials and does – how does the potential delays should they occur impacting your cash runway?.

Charles Theuer

Great question, Jim. So I think with respect to the current trial that TJ4309 Phase I trial, we haven't seen an impact of the COVID-19 on that trial. And that's mainly because we opened it at four sites. And when you have a three plus three design, you have four sites; you end up having actually sites fighting over the slots to enroll patients.

So we were smart to do that. I mean, MD Anderson for example is one of the sites and they did hold enrollment, but because we had three of the sites open that didn't, we didn't see an impact in enrollment in that trial.

With respect to ENVASARC, I'd point out the falling we have been doing calls with up to 20 sites that we expect to enroll-in or to participate in this trial.

And to almost a site, I would say the sites say it is business as usual, in terms of patients coming in, yes, they get screened at the clinic door for temperature and if they have a temperature they would go to the ER for an evaluation. But patients get screened at the door, they come in, they do their clinic visits as they would before the COVID-19.

We had a lot of concern about this as your question might have implied, but we've been very happy that oncology patients, especially those were refractory sarcoma treatment and they've been able to receive treatment throughout the epidemic. Even in areas where the epidemic has been most fulminant patients have remained on clinical trials.

There have been more telemedicine visits, but when patients need to come in for treatment, they come in for treatment. So overall we haven't seen a huge impact at the sites that we enroll patients in the study and we do not expect COVID-19 will affect the timeline of the trial..

Jim Molloy

Honestly cancer certainly not taken vacation during this as well.

The question on part of the, injection, more than we spoke about before, was sort of ease of injection and how that could be differentiating factor, obviously if you get a better objective response, that's really all you need how you inject it, but how would that play in if it's more equivocal data, you'd have a much simpler method of delivering product?.

Charles Theuer

Yes, good question, So yes, our goal is to show that this drug has a similar efficacy and safety profile of the PD-L1 class of therapeutics. And the differentiating feature, as you said is the subcutaneous administration. And to be clear, this is subcutaneous administration without an adjuvant.

So this is not like taking an antibody and having to mix it with allozyme enhanced technology where you inject say a 10 cc to 15 cc bolus subcutaneously. This is a simple 2 cc or less injection that is given in the arm, in the thigh, abdomen, lower back. It's very different in that sense. And so we feel this is a major advance.

You don't have to come into an infusion center and sit in a chair to get this therapy; you literally could receive this therapy as part of an outpatient visit at your clinical oncologists.

Literally you come in, you see your oncologist, much like where I go in to see our general practitioner and we get a flu shot, that could be the simple paradigm for use of envafolimab in the clinic. Beyond that, there's also the potential to then do home dosing, patients dose Lovenox at home, they obviously dose insulin at home.

Again, for this trial to be clear, our plan is to have this drug dosed by healthcare professional, but longer-term this does have the potential to be administered by self administration. Again, given that it's fairly straightforward, 2 cc or less injections, subcutaneous and easily accessible anatomic regions..

Jim Molloy

Thank you for taking the questions..

Charles Theuer

Appreciate it, Jim. Thank you..

Operator

Thank you. Our next question comes from Jim Birchenough from Wells Fargo. Please go ahead..

Nicholas Abbott

Good afternoon. It's Nicole for Jim, this afternoon. First off Charles, congratulations on the envafolimab agreement quite a feather in your cap to get that trial designed.

On that, did you go to the FDA with a suggestion for the combination arm or was that something that was an agreement during the discussion process?.

Charles Theuer

Hi, Nick, I appreciate the question. I mean, the reason we were so pleased with the meeting with the FDA, Nick is, we proposed the exact trial design that they agreed to.

We felt that combination arm, as I mentioned briefly in some prior comments really could revolutionize the care of patients, not just UPS and MFS through the data we expect to produce for this trial, but potentially even in larger and other sarcoma subtypes. So that was I think the real joy to us.

And I think, the great part of the interaction with the FDA, the FDA was in a very collaborative respect to understanding our goal here to really meet this unmet need, understanding that the combination therapy could potentially be the best way to increase the response rate in refract UPS and MFS and offered very helpful comments, but agreed with the scheme, the end points, the eligible patient population, all the key items that are needed to implement in this trial..

Nicholas Abbott

Okay. Thank you.

And then is there any off label uses of any one or other checkpoint inhibitors in the intent to populate patients to your question?.

Charles Theuer

Yes, that's a great question, Nick. It's very – I’d say dependent on the investigator. So there are clearly investigators that are using, for instance, Keytruda in UPS and refractory disease. I would say those that do use restricted patients that have PD-L1 expression.

There are many very experienced academic investigators that have not yet moved to that level. And I would say the many community practice physicians that also don't use us as standard therapy in UPS even if it's PD-L1 positive, but clearly certain academic centers do use Keytruda off label in UPS.

It's hard to estimate what the overall use is across the entire spectrum of patients, Nick. But I think it would be overall the great minority of physicians are using Keytruda off-label in UPS at this time..

Nicholas Abbott

Great, thanks. And then last one on the envafolimab, I mean, I had a quick look on clinicaltrials.gov and they're awesome. And the PD-L1 combination trials ongoing at major U.S.

centers, will you be competing for patients at those centers or will you be targeting centers where there are no active trials ongoing?.

Charles Theuer

Yes. We're actually targeting, Nick all the top centers in the U.S., we expect to participate in this trial. If you consider the sites we use for the Tappas Trial, we had 27 U.S. sites for that study. It's really going to be the majority of those or the similar sites will be used for the ENVASARC trial.

And yes, there may be other studies going on, but to our knowledge those centers are not doing a trial where they're using a checkpoint inhibitor in the refractor UPS, MFS setting that would compete with this trial. And I think that's an important point.

I would say one more time, the enthusiasm of the community of investigators for this trial is very intense and a pleasant thing to encounter. So, we don't feel there'll be competitive issues at any of these sites. And to be clear if there was a competitive issue, some of these sites couldn't open the trials.

In other words, the top centers, if there's a study for the exact same population as a study that's already opened, they won't enroll your study and we have not encountered that issue at all with respect to the 20 or 21 sites.

We expect to enroll this to participate in this study and again, they are the crème de la crème, I would say of cancer centers in this country..

Scott Brown Chief Financial Officer

Nick, just to add to that, so presumably if they had a trial in an earlier stage patient population, once they've been exposed to either PD-L1 inhibitor or to ipilimumab, they would be become ineligible for your trial..

Charles Theuer

Oh, that's true. If those patients – if those centers are seeing a first line patients on a checkpoint inhibitor trial to your point, they would not be eligible for this trial.

I would say this Nick, that the majority of patients we expect to enroll in the refractory setting at these major centers, many of them will receive their first line therapy elsewhere. So they'll get doxorubicin therapy, say in a community oncology setting, because that's kind of what everyone gets.

Once they feel that that's the timeframe where they come to the more specialized clinical care or sorry, comprehensive cancer center and would be a great person to enroll in our trial..

Nicholas Abbott

Okay, terrific. Thanks Charles and good luck..

Charles Theuer

Thank you, Nick. Yes, thanks Nick. Appreciate it. .

Operator

[Operator Instructions] Our next question comes from Bert Hazlett from BTIG. Please go ahead. .

Bert Hazlett

Thanks. Just one additional follow-up on I-Mab and 4309, Charles, just to be clear, you are conducting that Phase 1 study in the United States and you will be generating that data. That's the way this relationship continues to evolve right now..

Charles Theuer

That's exactly right. Yes. We're fully responsible for the regulatory and clinical development of TJ004309 in the United States..

Bert Hazlett

Okay. Look forward to additional progress.

I know you're sensitive to this, but can you say what the next steps are in the dispute resolution process?.

Charles Theuer

Yes, I really can't comment further on that Bert. Yes, I mean our focus really right now is the pivotal study for envafolimab.

I mean that's, that kind of some of our thoughts is the driver of value for TRACON and to come out of that FDA meeting with the concurrence and the agreement from the agency around that trial was, as Nick noted was a great feather in our cap and it sets the stage now for several events over the next quarter that should be culminating in the actual enrollment of the pivotal study..

Bert Hazlett

Yes, we look forward to the data and again thanks for taking the question. .

Charles Theuer

Thank you Bert, much appreciate it..

Operator

Thank you. I am showing no further questions in the queue at this time. I'd like to turn the call back over to Dr. Charles Theuer, President and CEO for closing remarks..

Charles Theuer

Well, we thank you for your time and attention today. And we look forward to speaking with you again in next quarter..

Operator

Ladies and gentlemen, thank you for participating in today's conference call. This concludes the program. You may now disconnect..

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