ADC Therapeutics SA (ADCT) Q3 2021 Earnings Call Transcript

ADC Therapeutics SA (ADCT -1.58%)
Q3 2021 Earnings Call
Nov 02, 2021, 8:30 a.m. ET

Contents:

• Prepared Remarks
• Questions and Answers
• Call Participants

Prepared Remarks:

Operator

Welcome to the ADC Therapeutics third quarter 2021 financial results conference call. My name is Kevin, and I'll be your operator for today's call. [Operator instructions] I will now turn the call over to Amanda Hamilton, investor relations manager. Amanda, you may begin.

Amanda Hamilton -- Investor Relations Manager

Thank you, operator. This morning, we issued a press release announcing our third quarter 2021 financial results and business update. This release is available on the ADCT website at ir.adctherapeutics.com under the Press Releases section. On today's call, Chris Martin, chief executive officer; Jennifer Herron, chief commercial officer; Joe Camardo, chief medical officer; and Jenn Creel, chief financial officer; will discuss recent business highlights and review our third quarter 2021 financial results before opening the call for questions.

As a reminder, this conference call may contain forward-looking statements. Such statements are subject to risks and uncertainties. For additional information concerning forward-looking statements and factors that could cause actual results to differ materially from those expressed or implied in these statements, we refer you to the section titled Cautionary Statement Regarding Forward-looking Statements in Exhibit 99.3 of our report on Form 6-K filed with the US Securities and Exchange Commission earlier today. Such statements speak only as of the date of this conference call, and we expressly disclaim any obligation or undertaking to update these forward-looking statements unless required to do so by applicable law.

Today's presentation also includes non-IFRS financial measures. These non-IFRS measures have limitations as financial measures and should be considered in addition to and not in isolation or as a substitute for the information prepared in accordance with IFRS. You should refer to the information contained in the company's third quarter earnings release for definitional information and reconciliations of historical non-IFRS measures to the comparable IFRS financial measures. It is now my pleasure to pass the call over to our CEO, Chris Martin.

Chris?

Chris Martin -- Chief Executive Officer

Thanks, Amanda. And thank you, everyone, for joining us today. I'm very pleased to share an update of our progress during the third quarter. We successfully executed on our key objectives: driving the Zynlonta launch, advancing the R&D pipeline, and achieving several important corporate development goals.

We are now approximately six months into the Zynlonta launch. And we are encouraged by what we have accomplished to date, delivering $13.1 million in net sales in our first quarter of the launch. We have generated good momentum behind the launch driven by the unique product profile, the significant unmet need in third line plus DLBCL, and the strong execution of our highly experienced team of sales and medical professionals. Jennifer Herron, our chief commercial officer, will share more details on our launch a little later in this call.

Buoyed by our first FDA approval, we remain committed to expanding our geographic footprint to provide Zynlonta to as many patients as possible worldwide with relapsed or refractory DLBCL. And EMA validated our marketing authorization application, and we received orphan drug designation in Europe. The Overland ADCT joint venture also made tremendous progress with the initiation of the pivotal phase 2 bridging study in China, which is intended to serve as a basis for a regulatory filing in China. In addition to geographic expansion, we are also continuing to evaluate Zynlonta in combination with other agents in earlier line opportunities in DLBCL and as a single agent in follicular lymphoma.

On the R&D front, we continue to advance our pipeline programs, which are important for driving long-term value for the company. We initiated the phase 1 study for ADCT-901 targeting KAAG-1 and entered into a collaboration with the NCI for the development of ADCT-701 targeting DLK-1. For Cami, we continue to advance the phase 2 trial in relapsed/refractory Hodgkin lymphoma and the phase 1b study in solid tumors. Joe Camardo, our chief medical officer, will elaborate on our key programs in a few moments.

Finally, during the quarter, we extended our cash runway by entering into a financing agreement with Healthcare Royalty Partners for up to $325 million with the continued development of the commercialization of Zynlonta and Cami. I would now like to turn the call over to Jennifer to provide some insights on our progress with the Zynlonta launch. Jennifer?

Jennifer Herron -- Chief Commercial Officer

Thank you, Chris. And good morning, everyone. I'm happy to be here today to share an update on the US Zynlonta launch. We are pleased to report Zynlonta net sales in the third quarter of $13.1 million, representing our first full quarter of Zynlonta sales.

This early launch performance has been driven by Zynlonta's differentiated product profile; the significant unmet medical need in third line plus DLBCL; and the strong execution of our seasoned cross-functional team of sales, marketing, market access, and medical affairs professionals. In terms of additional insight into our launch dynamics, our commercial team has made good progress initiating new accounts and driving increased volume from existing accounts, including our prioritized key accounts in NCCN, NCI centers. Despite continuing COVID-related challenges, our targeted launch efforts have resulted in significant increases in brand awareness, perception, and intent to prescribe. And we are also competing well in terms of share of voice.

The differentiated Zynlonta product profile continues to resonate with both academic and community-based physicians. During the third quarter, not surprisingly, academic center support resulted in greater than 50% of Q3 total volume, with an equal proportion of ordering accounts coming from academia and the community. Recently, we have seen increasing volume from the community, as expected, as payer access and reimbursement turnaround become more reliable. In terms of patient access, we are very pleased with our progress.

Our payer and medical teams have achieved broad access for patients with no barriers encountered thus far. And we expect the permanent J code in January of 2022 to accelerate local community reimbursement trial and adoption. Anecdotally, we hear that the patient experience in the real world is similar to the LOTIS-2 trial experience, which supports the broad use of Zynlonta across the third line plus DLBCL patient population. While our initial use has been predominantly in the fourth line patient population, Zynlonta has also been used in the third-line setting, including patients who may go on to CAR-T after Zynlonta.

Recall that in the LOTIS-2 trial, 16 patients received CD19 directed CAR-T therapy after treatment with Zynlonta with an investigator-assessed ORR of 44%. The differentiated product profile, which is a unique combination of robust single-agent efficacy with a median time to response of 41 days, a generally manageable side effect profile, and convenient 30-minute infusion every 21 days, make Zynlonta an incredibly competitive agent in the third line plus setting and why we believe that Zynlonta has the potential to be the third line plus standard of care. As for the launch outlook for the rest of the year, we will be proactively monitoring the impacts of COVID, the opportunities for face-to-face visits, and the variability around patient scheduling with the upcoming holiday season. Specifically, regarding operating in the COVID environment, the cross-functional team, including marketing, sales, market access, and medical affairs, have been navigating the hybrid launch with the agility to engage both virtually or in-person depending on geographic guidelines and physician preferences.

While institutions and other face-to-face opportunities have not opened up as quickly as we had hoped, our face-to-face engagement has been stable over the last few months at about half of all of our interactions. In summary, we are encouraged by the HCP reception to Zynlonta's differentiated product profile resulting in positive launch momentum generated to date, while recognizing the incredibly dynamic environment. We acknowledge the uncertainties associated with the evolution of the pandemic, but believe there remains an opportunity to unlock the full potential of Zynlonta as the standard of care in its label indication. And our team is focused on bringing Zynlonta to any patient who may benefit from treatment.

We look forward to keeping you updated on our launch progress. Now I'll turn the call over to Joe to provide an update on our pipeline. Joe?

Joe Camardo -- Chief Medical Officer

Thank you, Jennifer. I am very pleased to be able to talk to you today about how ADC Therapeutics is working to move Zynlonta beyond our first indication with studies in combination with other agents, in earlier lines of treatment, and in different subtypes of non-Hodgkin's lymphoma. Starting with the LOTIS-2 trial, we are evaluating Zynlonta in combination with ibrutinib for relapsed or refractory diffuse large B-cell or mantle cell lymphoma. We are initiating a phase 2 program with a higher dose and more frequent administration of Zynlonta to determine the complete response rate and durability of response as well as the tolerability of this combination for potential use in earlier lines of treatment.

Our ongoing confirmatory phase 3 LOTIS-5 clinical trial of Zynlonta in combination with rituximab is intended to support a supplemental BLA filing as a second-line therapy for relapsed or refractory DLBCL patients who are not eligible for stem cell transplant. This trial continues to enroll patients, and we expect to complete enrollment of the safety lead-in of this trial by the end of this year. The phase 2 LOTIS-6 trial in relapsed or refractory follicular lymphoma is ongoing. And our published data from the phase 1 study showed that 11 of 14 patients had a response to Zynlonta, including nine patients who showed a complete response.

The median duration of response was not reached in that phase 1 trial. In addition to these trials, we aim to initiate several additional Zynlonta trials by the end of the year, including a study of Zynlonta that evaluates four different combinations in separate arms and a dose-finding study of Zynlonta in combination with R-CHOP in previously untreated DLBCL patients. These trials will explore the expansion of Zynlonta into earlier lines of therapy across B-cell non-Hodgkin lymphomas. And finally for Zynlonta, we are looking forward to discussing new data to be released at the upcoming ASH conference.

Moving to Cami, we continue to advance both our Hodgkin lymphoma and solid tumor programs, with enrollment in the phase 2 trial in Hodgkin lymphoma completed in February 2021. We plan to have preliminary results in the first half of 2022, after which we will share the next steps for a pathway to regulatory submission. We also continue to advance Cami with our ongoing phase 1b dose-escalation trial in combination with pembrolizumab in patients with advanced solid tumors. Furthermore, we are supporting our pipeline that leverages our validated ADC platform applied to the treatment of solid tumors.

During the third quarter, we dosed the first patient in the phase 1 study of ADCT-901 targeting KAAG-1, a novel first-in-class candidate for the treatment of patients with advanced solid tumors with high unmet medical need, including platinum-resistant ovarian cancer and triple-negative breast cancer. Another promising pipeline candidate is ADCT-601, mipasetamab uzoptirine, targeting AXL. AXL is over-expressed in many solid tumors such as lung, breast, prostate, pancreas, glioma, and esophageal cancers. We expect to initiate the phase 1b combination study in multiple solid tumors in the first half of 2022, and we look forward to sharing more details about this program in the coming months.

As Chris mentioned earlier, we entered into a collaboration with the National Cancer Institute to develop ADCT-701 targeting DLK-1 in neuroendocrine malignancies with high unmet medical need. This includes adrenocortical carcinoma, pheochromocytoma, paraganglioma, neuroblastoma, and small cell lung cancer. And finally, our ADCT-602 program targeting CD22 continues to enroll patients in a phase 1/2 trial for relapsed or refractory acute lymphoblastic leukemia. This is in collaboration with MD Anderson and City of Hope medical centers.

We also have a robust R&D pipeline with seven preclinical development programs. And we look forward to keeping you updated on all of these programs. With that, I will turn the call over to Jenn to give a financial update.

Jenn Creel -- Chief Financial Officer

Thank you, Joe, and good morning, everyone. As reported in the press release issued earlier today, Zynlonta third quarter net sales were $13.1 million, reflecting the first full quarter of Zynlonta sales. As of September 30, we had cash and cash equivalents of $530 million as compared to $372 million as of June 30 of this year. During the third quarter, we used roughly $59 million in cash for operating activities.

In August, we entered into a financing agreement with Healthcare Royalty Partners for up to $325 million, including gross proceeds of $225 million received upon closing. R&D expenses were $37 million for the third quarter of 2021 compared to $32 million for the same quarter in 2020. The increase was primarily related to the medical affairs support of the Zynlonta launch and the expansion of the Zynlonta clinical program and our broad portfolio. Selling and marketing expenses were $17 million for the third quarter of 2021 compared to $6 million for the same quarter of 2020.

The increase in selling and marketing reflects the expenses for the Zynlonta launch and the ongoing commercial efforts. G&A expenses were $17 million for the third quarter of 2021 compared to $14 million for the same quarter of 2020. The increase was primarily due to increased headcount to support the needs of a commercial-stage public company. Net loss was $72 million for the third quarter of 2021 compared to a net loss of $20 million for the same quarter of 2020.

Our diluted net loss per share was $0.93 in the third quarter of 2021, compared to a net loss of $0.29 for the same quarter of 2020. Finally, adjusted net loss, a measure that excludes certain items associated with the Deerfield convertible loan, share-based compensation expense, and effective interest expense associated with the royalty financing agreement with Healthcare Royalty Partners, was $46 million for the third quarter of 2021 compared to an adjusted net loss of $41 million in the same quarter 2020. The increase in adjusted net loss was primarily driven by the investment in the Zynlonta launch and our clinical programs. The adjusted diluted net loss per share was $0.59 for the quarter, compared to a loss of $0.58 for the same quarter in 2020.

With that, I will turn the call back to Chris for closing remarks. Chris?

Chris Martin -- Chief Executive Officer

Thank you, Jenn, Joe, and Jennifer. To conclude, this has been a productive quarter for ADCT. We continue to execute on the Zynlonta launch and to advance our R&D pipeline. Our objectives for the remainder of the year and into 2022 are clear, and we are well-positioned to execute on all aspects of the business.

We look forward to updating you on the progress of our launch and our advancing pipeline in the coming quarters. I'm pleased to now open the call for questions. Operator?

Questions & Answers:

Operator

Thank you. [Operator instructions] Our first question comes from Matthew Harrison with Morgan Stanley.

Matthew Harrison -- Morgan Stanley -- Analyst

Great. Good morning. Thanks for taking the questions. I guess two for me, so one on the launch.

I know you've commented on sources of business sort of being 50/50 commercial/academic. I was wondering if you've seen any changes quarter-over-quarter in terms of repeat prescribers, or where you're seeing anything around duration or any other items like that? And then secondly on Cami, do you need to meet with the regulators again once you see the data in the first half of '22? Or maybe you can just outline exactly what the steps are you going to need to take.

Chris Martin -- Chief Executive Officer

Thank you, Matthew. So, Jennifer, do you want to take the first question? And, Joe, the second?

Joe Camardo -- Chief Medical Officer

Sure.

Jennifer Herron -- Chief Commercial Officer

Yes. Sounds good, Chris. Thanks. Matthew, so in terms of what we're seeing in the evolution quarter over quarter, we continue to see, as I mentioned, a greater percentage of our volume coming from academia.

I will say, over the most recent weeks and months, that we're getting increasing use in the community. And we would expect that to continue. So I think from a repeat order perspective, the volume is still predominantly coming from academia, but we're getting newer and newer accounts coming from the community in the recent weeks. From a duration perspective, six months into launch, I think it's too early to say what we're getting from a duration perspective.

I mean in the third line plus setting, what we're hearing from HCPs is they're looking sort of patient by patient, a very individualized approach that really depends on where that patient is in their treatment paradigm. So it's really hard to extrapolate to a general population. I think it's just too early for that right now.

Joe Camardo -- Chief Medical Officer

OK. This is Joe. We'll follow a pretty standard procedure here. We're going to finish the study; compile the data; put together a briefing book; request a meeting, and explain what we want to do next, which is the possibilities of submission for accelerated approval as well as a proposal for a confirmatory study.

The FDA has, in the last few years, often answered questions and said they don't need a meeting. I have a feeling in this case, we'll have a meeting with them sometime in the latter part of next year. And that's pretty standard.

Operator

Thank you. Your next question comes from Tazeen Ahmad with Bank of America.

Tazeen Ahmad -- Bank of America Merrill Lynch -- Analyst

Good morning and good afternoon. Thanks for taking my questions. I have a few, the first maybe a follow-up on Matthew's question about use. So for the increased use from community doctors, is it just doctors who've had experience with Zynlonta in the community setting are just prescribing it to more patients? Or are you getting more of the growth from new users? And then secondly as it relates to Cami, for relapsed and refractory HL, can you give us a sense of where you would expect to see GBS observations; and whether any observation in your mind could be rate limiting, based on what doctor feedback has been so far? And then I have a couple of follow-ups.

Chris Martin -- Chief Executive Officer

Thank you, Tazeen. Again, Jennifer, do you want to take the first one? And Joe, the second?

Joe Camardo -- Chief Medical Officer

Yes. OK.

Jennifer Herron -- Chief Commercial Officer

Yes. So, Tazeen, thanks for the question. In terms of our youth in the community, I think we're seeing a really healthy mix of new orders and repeat orders. We're adding new accounts every week.

And we're seeing good repeat orders from the existing accounts and the addition of new accounts. So it's not -- in the community, I'm not seeing a concentration of business, if that was your question.

Joe Camardo -- Chief Medical Officer

OK. With regard to the question about Cami, the first thing is the -- based on the data that we're seeing now, the balance of benefit/risk is favorable. We've had no increase in the incidence of GBS over the trial. We have some activities in place to make sure that they decide that particular side can be mitigated.

And keep in mind that we're treating patients who have a median of six prior treatments, including patients who failed what I call modern treatment with brentuximab and pembrolizumab, and also patients who have relapsed after stem cell treatments. So this is a very high bar, and we've reached that with the complete response rate in the range of 28%. So we're positive on the benefit/risk. And we are confident that FDA will see that as long as we're able to provide all the data, which we plan to do next year.

Tazeen Ahmad -- Bank of America Merrill Lynch -- Analyst

OK. But are you expecting to see a significant level of GBS even with the changes that you've made? Are those the levels that are expected?

Joe Camardo -- Chief Medical Officer

We have -- we're at -- we have 7% -- seven cases, 6%, sorry. And I expect that's going to be the number. We have a lot of patients now, and I think that's going to be the number of GBS cases. It could be a little lower when we go into clinical practice, it could be a little bit higher, but that is the number that we expect to see.

And as I mentioned, we've been able to mitigate the more serious cases. So we think that given the benefit here, which is a complete response rate in the 28% range, patients who have a median of six prior treatments that have repeatedly failed, this is an addressable side effect. And that's our -- and that we have the data to be able to demonstrate that and explain it to physicians.

Tazeen Ahmad -- Bank of America Merrill Lynch -- Analyst

OK. Thank you.

Joe Camardo -- Chief Medical Officer

OK. You're welcome.

Tazeen Ahmad -- Bank of America Merrill Lynch -- Analyst

OK. Lastly, the KAAG-1 that you just mentioned moving into the clinic starting a study this year, should we expect to see any data next year? And then as it relates specifically to platinum-resistant ovarian, can you just remind us what the other options are currently for patients? And what level of efficacy are you looking for?

Joe Camardo -- Chief Medical Officer

Yes. I have a -- I'm sorry. I can't hear your questions very well. Were you asking about KAAG --

Tazeen Ahmad -- Bank of America Merrill Lynch -- Analyst

Yes.

Joe Camardo -- Chief Medical Officer

Or about KAAG --

Chris Martin -- Chief Executive Officer

Yes. Sorry. Sorry, the question was with KAAG-1, do we expect to see any data this year? And for ovarian cancer patients, what alternative therapies are there for this stage of treatment? And what level of activity would we expect to see?

Joe Camardo -- Chief Medical Officer

Well, OK. Thanks. Thanks, Chris. I didn't hear the -- I heard everything except which of our products you wanted to hear about.

So with KAAG, we're not going to have any data this year to share. I mean we just started phase 1. And it's proceeding at exactly the right pace, which is a careful dose escalation in patients with refractory cancers. Generally depending on how the safety proceeds, we can advance according to our regular schedule.

So I'm thinking maybe sometime in the latter quarter of next year, we could have some data on the safety and develop a plan to proceed. The short answer to your ovarian cancer question is there really aren't any alternatives, which is why KAAG is an attractive option here. Ovarian cancer continues to be a serious and highly refractory illness once it reaches that late stage of relapse. So at this point, are there other novel -- maybe not novel, but there are other products in development, but nothing that is novel as KAAG.

And there is this interesting expression of KAAG on ovarian tumors, which is why we chose that. But right now, the field of options is pretty limited.

Tazeen Ahmad -- Bank of America Merrill Lynch -- Analyst

OK. Thank you.

Joe Camardo -- Chief Medical Officer

You're welcome.

Chris Martin -- Chief Executive Officer

Tazeen, about your last question, we haven't seen any GBS in the solid tumor setting with Cami.

Tazeen Ahmad -- Bank of America Merrill Lynch -- Analyst

Yes. OK. Thank you.

Operator

Our next question comes from Boris Peaker of Cowen.

Boris Peaker -- Cowen and Company -- Analyst

Great. My first question is on Zynlonta. Can you comment on the data we should we expect to see at ASH?

Chris Martin -- Chief Executive Officer

Joe?

Joe Camardo -- Chief Medical Officer

Well, I can't be specific about the data you're going to see ash because it's still under embargo. But I will tell you that as commonly done, we will have longer-term follow-up. We will have some subgroup analyses. As you recall, we have these -- we have patients in our Zynlonta trial that were not eligible for some of the other trials going on at the same time.

And so we're going to be rereporting it on those kinds of analyses in addition to some longer follow-up. And we do have other products also available now that have been submitted to the ASH conference.

Boris Peaker -- Cowen and Company -- Analyst

Got it. And also can you -- what is the timing of the data readouts from LOTIS-3 and LOTIS-5? When do you anticipate top-line data?

Joe Camardo -- Chief Medical Officer

Yes. I can't really tell you that. We just started the amendment for LOTIS-3. We're likely to have some data from the completed part of LOTIS-3 by this time next year.

That's about right. But how the amendment proceeds, we'll determine when we will have some data, but it won't be -- it will not be probably before 2023. Just when -- you asked about LOTIS-5, we're just at the point where we're finishing the lead-in. We'll start to randomize part of this.

We expect that to take 18 to 24 months. And then I'd just remind you, it's an event-driven trial. So predicting when we'll have the events that will determine the difference between Zynlonta and rituximab and rituximab GemOx depends on the occurrence of progression. So it's hard to make a prediction.

But like I said, I can tell you what the enrollment period is probably going to be 18 to 24 months.

Boris Peaker -- Cowen and Company -- Analyst

Great. Thank you very much for taking my question.

Joe Camardo -- Chief Medical Officer

You're welcome.

Operator

Our next question comes from Brian Cheng with Cantor Fitzgerald.

Brian Cheng -- Cantor Fitzgerald -- Analyst

Hey, team. Thanks for taking my call, and congrats on a great quarter. It seems like you're tracking well against the historical sales trajectory for some of the competitive product in DLBCL. Do you have a sense of where you stand on market share in third line plus DLBCL? And then I have one more follow-up.

Thanks.

Chris Martin -- Chief Executive Officer

Jennifer?

Jennifer Herron -- Chief Commercial Officer

Yes. Thanks, Brian. Thanks for the question. Yes, we are pleased with this quarter's performance.

In terms of metrics, as I mentioned in my remarks, we've made some significant increases in awareness and familiarity and intent to prescribe. We're also holding our own in terms of share of voice. So we're happy with that. We are monitoring the market quite closely to make sure that we remain competitive and that we can adapt our hybrid launch plan as the local conditions require.

The Q4 is looking better in terms of COVID, but again that could change on a dime as we get into the winter months. One of the things that we are watching carefully is face-to-face interactions because of the importance of engaging nurses, pharmacists, and physicians about the differentiated product profile of Zynlonta. And of course, this is going to be our first Q4 in terms of any kind of seasonal effects with patient visits. So we're cautiously optimistic about Q4, and we'll be looking forward to updating you as that quarter wraps.

Brian Cheng -- Cantor Fitzgerald -- Analyst

Great, Jennifer. Maybe just on your AXL-targeted 601 program, can you give us an update on the manufacturing front? And what is your latest thoughts on patient selection and the initial set of indications? And then ahead of the upcoming update from the competitor AXL tied to ADC in sarcoma at the CTOS meeting later this month, how should we think about the potential read-through from their update to your 601 program?

Chris Martin -- Chief Executive Officer

Probably manufacturing side, I just think. As you know, we're using the Synaffix site-specific conjugation in the AXL program. We did the Phase I dose-escalation study, as we normally do, using frozen product. And we're now moving to manufacturing lyophilized product.

So manufacturing is well underway to supply the clinical study for when we will start in the first half of next year. I'll hand it over to Joe to address the clinical aspects. Joe?

Joe Camardo -- Chief Medical Officer

OK. OK. Thanks, Chris. You won't be surprised to hear that we're also interested in sarcoma.

There are a lot of reasons why those of us doing work in AXL find sarcoma to be an attractive target. But we don't have our protocol finalized yet. We're working on a couple of details with investigators and with the FDA to try to determine how we can do better than just selecting a literature-based tumor and try to get some -- the population a little more likely to respond to AXL. So I just don't have the final details to share.

But when we have that protocol final, then I'll be able to share some data. That's probably going to happen in the first half of next year. That's the current plan. And the -- with regard to the competitor, I mean I tend to try to learn what we can from our competitors.

But we have a unique PBD toxin, and we think that we have very high potency here. So we think that with the expression levels that we're going to be able to determine in the trial, we'll be able to get entry of the toxin into the malignant cells. That's our proposal now. And I think that it really does depend on the potency of the toxin and our ability to help enhance the chances of finding a highly expressed AXL tumor.

So there's a couple of details to be filled in. But we're doing it now, and I'll be able to give you more on this in the first half of next year.

Brian Cheng -- Cantor Fitzgerald -- Analyst

Great. Well, we look forward to that. Thanks for taking my question.

Joe Camardo -- Chief Medical Officer

Thank you.

Operator

Our next question comes from Kelly Shi with Jefferies.

Kelly Shi -- Jefferies -- Analyst

Thank you for taking my question. Congrats on a great quarter. So on gross to net for Zynlonta, is it staying around the same at 83% as mentioned in Q2? Or are we going to expect some change? And I have a follow-up on Cami.

Chris Martin -- Chief Executive Officer

Jennifer?

Jenn Creel -- Chief Financial Officer

Chris, this is Jenn. I can jump in here.

Chris Martin -- Chief Executive Officer

Of course, Jenn. Please do.

Jenn Creel -- Chief Financial Officer

Jenn, Jennifer, confusing. Thanks, Kelly, for the question. So our gross to net details, you can see in our 6-K we filed this morning. But the Q3 gross to net, the deductions were right around 14%.

And that's really right in the general range that we'd expect for an infusion drug in this kind of specific patient population. But it's early days, and we do expect this to fluctuate. We really only have a few months of actuals at this point, and we still have some estimates included in our sales reduction. So we'll continue to monitor this as we move forward and let you know if there's any update.

Thanks for the question.

Kelly Shi -- Jefferies -- Analyst

And also for Cami, could you share the possible hypotheses regarding the incidence of GBS tox? Do you think the prior PD-1 antibody treatment had some association with GBS? We have seen some documented cases for PD-1 treatment to trigger GBS in heavily pretreated patients. And also will you be able to rule out the possibility this will happen to solid tumors, based on what you have learned?

Chris Martin -- Chief Executive Officer

Joe, do you want to take that? Or --

Joe Camardo -- Chief Medical Officer

Sure. It's a very good question. And it's we -- first of all, we know that the Hodgkin lymphoma patients have a bit more of a predisposition to Guillain-Barre. So that's one thing that we have to keep in our minds when we consider this.

And we do know that it has to be related to some kind of enhancement of immune system. But right now, it's all speculative for us at this point. We can't find exactly the trigger that activates the immune system specifically to -- against the nervous system. We just don't know that yet.

It's not inconsistent with data from the checkpoint inhibitors that these kinds of immuno-inflammatory side effects can happen. So it's a reasonable hypothesis that the activation of the immune system, that's about as far as we can go. We cannot say anything specific or unique about the Cami activity. With regard to the solid tumors, we saw Guillain-Barre pretty early in the program for Hodgkin's lymphoma.

And as I mentioned, Hodgkin's lymphoma patents have a predisposition to this. We've done enough patients now in the solid tumor, and we're getting a very high level of confidence that this is not something that will happen with solid tumor patients. And that's just based on comparative observation of when we saw this in Hodgkin's lymphoma and how many patients we have in the solid tumors program. And we're continuing to look into this -- look into really what's actually happening with this.

But it's difficult. And a lot of people are trying to help to work on this as well, even with the checkpoint inhibitors. Thanks for the question.

Kelly Shi -- Jefferies -- Analyst

Thank you so much for the color. One last question if I may regarding the AXL, AXL program. So from competitors, some of their programs actually be able to show the correlation between AXL expression and tumor response, but some are not able to. I wonder, would you be able to comment on ADC Therapeutics' biomarker study or maybe clinical design? Like what's your expectation on that front?

Joe Camardo -- Chief Medical Officer

Yes. I can't really give you any commentary on the clinical design because it's not finalized yet. But as you know once we do finalize this protocol, we'll be listed on clinictrials.gov. So it's not like you'll never hear about it, you certainly will.

But one thing to point out is that for companies that are pursuing AXL over-expression as a way to determine response, they're looking at how AXL is driving the tumor. We're looking at how AXL is a door to get our toxin into the cell. That's a little bit different. Now there may be some activity of our antibody to depress the activity of AXL, but what we're really looking at is getting a highly potent toxic into the cell.

And so it's not really a very good comparison to look at AXL as a specific target driving the malignant cell, as it is to look at AXL as a way of getting our toxin into this. They're totally different mechanisms. And you'll see more data in the future.

Kelly Shi -- Jefferies -- Analyst

OK. That's very helpful. Thank you.

Chris Martin -- Chief Executive Officer

You're welcome.

Operator

Our next question comes from Kennen MacKay with RBC Capital Markets.

Kennen MacKay -- RBC Capital Markets -- Analyst

All right. Thanks for taking the question, and congrats on the quarter, very impressive commercial result there. I have three questions on Cami. First, I just wanted to clarify, have you requested or had a pre-BLA meeting with the FDA for Cami yet? And then second, another question on the etiology of GBS.

Have you identified any factors that are associated with risk of recurrence, whether it's treatment history or any biomarkers? And can that GBS-like effect be replicated in animal models? And then lastly, I just wanted to see how the Cami and pembro combo trial in solid tumors was going and when we could expect to see data from that trial. Congrats again.

Joe Camardo -- Chief Medical Officer

OK. Good questions. Good questions. First of all with regards to the FDA request, we have not requested a meeting yet.

We agreed with them, when we proceeded with our phase 2 program, that we would wait for the one-year follow-up on data before we compile the data and request a meeting. The 1-year follow-up will be in February of 2022, then we'll compile the data and request a meeting. The reason for that is the duration of response was considered to be an important variable. So we don't want to see the data until we have the one-year follow-up showing good duration of response.

And just a reminder, we still -- in the data we've been showing, we've still not yet reached -- the median duration of response has still not been reached in these patients. So that's a good thing, but we're going to wait till one-year follow-up. The second question, to my knowledge, we can't replicate this phenomenon in animals, because it's like you have to have a Hodgkin lymphoma model in animals. And it's really you can't -- maybe with a transplant tumor, I'll just be speculating here.

We can't really replicate this in an animal model. We can replicate some of the immuno-inflammatory activities that happen when you depress the Treg cells. But that's a long way from an actual animal model of Guillain-Barre syndrome. And so far -- it's a great question to ask because we are looking exactly at what you suggest, which is how about -- what about the treatment history? Is there a biomarker? Is -- And it's -- it hasn't yet yielded a specific answer for us, but we're still looking.

And a reminder, these are very complicated treatment histories, so it's not a big surprise that you can't sort out something. It's not something obvious, but we're continuing to look. So you're right on target with like what kinds of research we have to do, to try to mitigate the side effect, given that there is such a promising response rate in these patients. And the third thing, the Cami program is, in solid tumors, is proceeding very well.

That I think reflects the high need for new drugs in the solid tumors that we are studying. But I can't tell you exactly when we're going to finish because we're still doing dose escalation. And as you know, you've got to do that carefully. So we're making sure that we get the right combination of coming with pembro.

And then once we expand, we'll be able to show what we've learned in terms of safety, what dose we've chosen, and what kind of responses we're getting. So it's still a little bit uncertain, but proceeding very well in terms of enrollment. OK? Did I lose everybody?

Operator

OK. And I'm not showing any further questions at this time. I'd like to turn the call back over to Chris.

Chris Martin -- Chief Executive Officer

Thank you. Thank you very much, everyone, for joining the call today. We look forward to keeping you updated on our progress, and have a nice day. Bye.

Joe Camardo -- Chief Medical Officer

Thank you.

Operator

[Operator signoff]

Duration: 44 minutes

Call participants:

Amanda Hamilton -- Investor Relations Manager

Chris Martin -- Chief Executive Officer

Jennifer Herron -- Chief Commercial Officer

Joe Camardo -- Chief Medical Officer

Jenn Creel -- Chief Financial Officer

Matthew Harrison -- Morgan Stanley -- Analyst

Tazeen Ahmad -- Bank of America Merrill Lynch -- Analyst

Boris Peaker -- Cowen and Company -- Analyst

Brian Cheng -- Cantor Fitzgerald -- Analyst

Kelly Shi -- Jefferies -- Analyst

Kennen MacKay -- RBC Capital Markets -- Analyst

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