On June 4, 2021 GRAIL, Inc., a healthcare company whose mission is to detect cancer early, reported the first results from the interventional PATHFINDER study evaluating Galleri, a multi-cancer early detection (MCED) blood test. The results, presented at the 2021 ASCO (Free ASCO Whitepaper) Annual Meeting, support Galleri’s performance in clinical settings (Press release, Grail Bio, JUN 4, 2021, View Source [SID1234583644]). The company also announced today that Galleri is now available in the U.S. by prescription only.

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"The interim results of PATHFINDER demonstrate that a routine blood test is capable of detecting many different cancers even before symptoms arise, an approach that has significant potential advantages," said Dr. Tomasz M. Beer, deputy director at the OHSU Knight Cancer Institute and presenting author. "Most importantly, it can detect cancers that have no recommended screening tests today, and more than two-thirds of cancers go unscreened for this reason. These results are a pivotal step toward extending early detection to many more types of cancer."

Clinical Data from PATHFINDER

PATHFINDER was designed to assess the implementation and performance of Galleri in a clinical care setting, evaluate the clinical care pathways following a "signal detected" Galleri test result, and measure the time required to achieve diagnostic resolution.

The study analyzed 6,629 individuals aged 50 years or older, an age group at elevated risk for cancer, but with no suspicion of active cancer. Compared to the general population, participants had equal or higher compliance with recommended breast and colon cancer screening tests.

In the interim analysis, an earlier version of Galleri accurately detected 29 cancers across 13 types: breast, colon or rectum, head and neck, liver and bile duct, lung, lymphoid leukemia, lymphoma, ovary, pancreas, plasma cell neoplasm, prostate, small intestine, and Waldenstrom macroglobulinemia. Of the new cancers detected, nearly 40% (9/23) were localized (stage I-II), and more than half (13/23) were detected before distant metastases (stage I-III). PATHFINDER participants will continue to be followed for 12 months, with final results expected in the first half of 2022.

"Finding cancer early, when treatment is more likely to be successful, is one of the most significant opportunities we have to reduce the burden of cancer," said Dr. Joshua Ofman, chief medical officer and head of external affairs at GRAIL. "These data suggest that, if used at scale alongside existing screening tests, the Galleri test could have a profound impact on how cancer is detected and, ultimately, on public health."

The interim PATHFINDER positive predictive value (PPV), or the likelihood that a person has cancer when a positive test result is returned, was 44.6% (95% CI: 33.2-56.7%), which is consistent with findings from GRAIL’s case-controlled Circulating Cell-free Genome Atlas (CCGA) Study.

When cancer was confirmed, Galleri’s first or second cancer signal origin prediction was 96.3% accurate (95% CI: 81.7-99.8%), with a median observed time to cancer diagnosis of 50 days. The interim analysis identified only four study-related adverse events (two related to mild anxiety before the test, one related to mild anxiety about the blood draw, and one related to mild bruising).

"Early cancer detection is critical to reducing the burden of cancer-related morbidity and mortality. These results reflect the potential real-world ability of Galleri to find deadly cancers earlier, and represent a leap forward in the effort to treat cancer more effectively," Dr. Beer said.

Data is presented by Dr. Beer, and the presentation will be available at View Source

Introducing Galleri

Galleri is now available in the U.S. by prescription only. The Galleri test is intended for use in those with an elevated risk of cancer, such as adults aged 50 or older, and as a complement to existing single cancer screening tests.

In an observational study, Galleri has demonstrated the ability to detect more than 50 types of cancer, over 45 of which lack recommended screening tests today in the U.S., with a low false positive rate of less than 1%. When cancer is detected, Galleri can determine the cancer signal origin with high accuracy. New CCGA data published today in Clinical Cancer Research, a journal of the American Association for Cancer Research (AACR) (Free AACR Whitepaper), also demonstrate the ability of GRAIL’s technology to preferentially detect cancers that are more aggressive than expected based on age, and the cancer stage and type.

The blood test is supported by what is believed to be the largest clinical study program in genomic medicine, with over 140 clinical study sites, including the Mayo Clinic, Dana-Farber Cancer Institute, Cleveland Clinic, Sutter Health, OHSU, Intermountain Healthcare, and U.S. Oncology Research.

Cancer is expected to become the leading cause of death in the United States this year, in large part because the majority of cancers are found too late when outcomes are poor. Recommended screening tests save lives, but only cover five cancer types in the U.S. In fact, 71% of cancer deaths in the U.S. have no recommended early detection screening.

For more information about Galleri, visit www.galleri.com.

REFLECTION Registry

GRAIL also announced it will establish a real-world evidence study, REFLECTION, to understand the experience and clinical outcomes of 35,000 individuals in the U.S. who are prescribed the Galleri test from a healthcare provider. This follows an announcement last fall that Galleri will be offered to eligible patients in the United Kingdom (UK) later this year as part of a partnership with the UK National Health Service to support its Long Term Plan for earlier cancer diagnoses.

Important Safety Information

Galleri is recommended for use in adults with an elevated risk for cancer, such as those aged 50 or older. The Galleri test does not detect all cancers and should be used in addition to routine cancer screening tests recommended by a healthcare provider. Galleri is intended to detect cancer signals and predict where in the body the cancer signal is located.

Results should be interpreted by a healthcare provider in the context of medical history, clinical signs, and symptoms. A test result of ​"Cancer Signal Not Detected" does not rule out cancer. A test result of ​"Cancer Signal Detected" requires confirmatory diagnostic evaluation by medically established procedures (e.g., imaging) to confirm cancer.

If cancer is not confirmed with further testing, it could mean that cancer is not present or testing was insufficient to detect cancer, including due to the cancer being located in a different part of the body. False positive (a cancer signal detected when cancer is not present) and false negative (a cancer signal not detected when cancer is present) test results do occur. Galleri is prescription only.

Laboratory/Test Information

GRAIL’s clinical laboratory is certified under the Clinical Laboratory Improvement Amendments of 1988 (CLIA) and accredited by the College of American Pathologists (CAP). The Galleri test was developed, and its performance characteristics were determined by GRAIL. The Galleri test has not been cleared or approved by the U.S. Food and Drug Administration. GRAIL’s clinical laboratory is regulated under CLIA to perform high-complexity testing. The Galleri test is intended for clinical purposes.

On June 4, 2021 Immutep Limited (ASX: IMM; NASDAQ: IMMP) ("Immutep" or "the Company"), a biotechnology company developing novel LAG-3 related immunotherapy treatments for cancer and autoimmune disease, announces new interim data from its Phase II TACTI-002 study (also designated KEYNOTE-798) with a data cut-off date of 16 April 2021. The data will be presented in two poster presentations by Dr Tim Clay, Investigator, St John of God Subiaco Hospital, Perth, Australia and Dr Irene Brana, Investigator, Vall d’Hebron Institute of Oncology, Barcelona, Spain at the American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper)’s (ASCO) (Free ASCO Whitepaper) 2021 Annual Meeting in on-demand sessions available from 9 am on 4 June 2021, US Eastern Time at this year’s virtual conference. The posters will also be made available on Immutep’s website from that time at:

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TACTI-002 is being conducted in collaboration with Merck & Co., Inc., Kenilworth, NJ, USA (known as "MSD" outside the United States and Canada). The study is evaluating the combination of Immutep’s lead product candidate eftilagimod alpha ("efti" or "IMP321") with MSD’s KEYTRUDA (pembrolizumab) in up to 183 patients with non-small cell lung cancer (NSCLC) in 1st and 2nd line (Parts A and B, respectively) or 2nd line head and neck squamous cell carcinoma (HNSCC, Part C).

Immutep CSO and CMO, Dr Frederic Triebel said: "As more and more industry focus is on LAG-3 therapies and it is in the spotlight of this year’s ASCO (Free ASCO Whitepaper), we are very pleased to be reporting such robust and exciting results from our TACTI-002 study of efti in combination with pembrolizumab. We are seeing nearly 50% of the evaluable 1st line NSCLC patients responding to the therapy, as scored by a blinded independent central review committee, with responses in all PD-L1 subgroups and a favourable median PFS. Overall, the NSCLC patients receiving this 1st line therapy are living 8.2 months without their disease progressing, a promising improvement for a chemo-free 1st line regimen. In effect, we are seeing an improvement in patient outcomes compared with that historically seen with anti-PD-1 monotherapy but with a similar safety profile and, also, comparable results in terms of ORR and PFS to chemo + anti-PD-1 combination therapy but, importantly, with a longer duration of response and lower toxicity."

Investigator, A/Prof Tim Clay, St John of God Subiaco Hospital, Perth, Australia said: "The median PFS of 8.2 months in 1st line NSCLC patients is very encouraging compared to historical studies where pembrolizumab has been given as monotherapy in comparable patient groups. There remains a great need for more effective chemotherapy free regimens in the treatment of NSCLC. These data are exciting and as a result, we will be expanding recruitment with 74 additional patients for Part A."

Investigator, Dr Irene Brana, Vall d’Hebron Institute of Oncology, Barcelona, Spain, said: "The sustained and durable responses reported in 2nd line HNSCC patients are improving as TACTI-002 progresses, with about 14% of patients now benefiting from a complete disappearance of all their tumour lesions. Responses are particularly good in PD-L1 expressing patients (CPS ≥ 1) where an ORR of 45.8% is reported. The strength of these results validates the decision to explore the combination of efti and pembrolizumab in a new Phase IIb study, TACTI-003 in 1st line HNSCC patients which is starting in the coming months."

Table 1 – TACTI-002 Interim ORR Results for Part A and C (data cut-off date: 16 April 2021)

Part A
1st line NSCLC1 Part C
2nd line HNSCC2
Tumour Response
Best Overall Response (BOR) per iRECIST Stages 1 & 2
N (%)
Total N=36 Stage 1 & 2
N (%)
Total N=37
Complete Response (CR) 2 (5.6) 5 (13.5)
Partial Response (PR) 13 (36.1) 6 (16.2)
Stable Disease (SD) 10 (27.8) 3 (8.1)
Progressive Disease (PD) 6 (16.7) 17 (45.9)
Not Evaluable 5 (13.9) 6 (16.2)
Disease Control Rate (DCR) 25 (69.4) 14 (37.8)
Objective Response Rate (ORR) 15 (41.7) 11 (29.7)
ORR in evaluable pts 15 (48.4), N=31 11 (35.5), N=31
Key Findings

1st line NSCLC – Part A

Sustained and durable responses: 15 patients with responses giving an ORR of 41.7% on an intention-to-treat basis and 48.4% in evaluable patients, as assessed by blinded independent committee read
None of the patients with a confirmed response progressed within 6 months and the median duration of response (DoR) is currently estimated to be more than 13 months in patients unselected for PD-L1 expression
2/36 (5.6%) patients had a Complete Response (complete disappearance of tumour lesions) and 23/36 (63.9%) of patients had a target lesion decrease (includes the 2 CRs)
Durable responses observed in all PD-L1 subgroups as assessed by local investigator read,3 for example:
ORR in the ≥ 1% PD-L1 subgroup was 44.0% (11/25)
ORR in the < 50% PD-L1 subgroup was 31.6% (6/19)
ORR in the ≥ 50% PD-L1 subgroup was 53.8% (7/13)
Median overall PFS is 8.2 months in patients unselected for PD-L1 expression, as assessed by local investigator read. This is very promising for a chemo-free 1st line regimen. Median PFS increases to 11.8 months in the ≥ 50% PD-L1 subgroup and median PFS in the < 1% PD-L1 subgroup is 4.1 months
Conclusion: The data presented for 1st line NSCLC is very encouraging and will be broadened by the ongoing recruitment in this patient population to form a solid basis for late-stage clinical development.

2nd line HNSCC – Part C

11 patients with responses giving an ORR of 29.7% on an intention-to-treat basis and 35.5% in evaluable patients
Durable responses with now 5 patients (13.5%) having a Complete Response. So far median duration of response is not yet reached. None of the patients with a response progressed within 6 months
In patients unselected for PD-L1 expression, median PFS is 2.1 months and median OS is 12.6 months
In patients in PD-L1 CPS ≥ 1 subgroup (N=24), ORR is 45.8%, median PFS is 4.1 months, and median OS is 12.6 months
Conclusion: The 2nd line HNSCC data is mature and continues to be very encouraging and forms an excellent basis to move into the 1st line HNSCC indication via Immutep’s randomised Phase IIb TACTI-003 study which is expected to start in mid-2021.

2nd line NSCLC – Part B
Stage 1 results were reported in November 2020 at SITC (Free SITC Whitepaper) and Overall Survival is trending favourably. Stage 2 recently opened for patient enrolment and combined results from Stages 1 & 2 are expected to be reported later this year.

Safety
The combination treatment continues to be safe and well tolerated with no new safety signals reported thus far.

Recruitment Update
Trial recruitment continues to progress well, with 127 patients out of up to 183 already participating at 12 clinical sites across Australia, Europe, the UK and US. At present, recruitment is ongoing for the expansion stage of Part A and Stage 2 of Part B.

Recruitment details for each Part of the trial are shown below and are current as at 1 June 2021.

Table 2 – TACTI-002 Recruitment (as at 1 June 2021)

Stage 1 (N)
Actual / Target Stage 2 (N)
Actual / Target Recruitment
Status Expansion Stage
Actual / Target
Part A (1st line NSCLC) 17/17 19/19 EXPANDED 23/74
Part B (2nd line NSCLC) 23/23 6/13 RECRUITING
Part C (2nd line HNSCC) 18/18 21/194 COMPLETE
Next Results
Immutep currently expects to report further interim data from Part A, final data from Part C, and new results from Stages 1 & 2 of Part B in 2H calendar year 2021 or early calendar year 2022.

Webcast Details
Immutep will present this data in a global webcast for investors. Details are as follows:

Date & Time:

Thursday, 10 June 2021, at 7:00 am Australian Eastern Daylight Time (AEDT) (Wednesday, 9 June, at 5:00 p.m. U.S. ET)

Register:

View Source

Questions:

Investors are invited to submit questions in advance via [email protected].

A replay of the webcast will also be available at www.immutep.com from the day after the event.

About the TACT-002 Trial
TACTI-002 (Two ACTive Immunotherapies) is being conducted in collaboration with Merck & Co., Inc., Kenilworth, NJ, USA (known as "MSD" outside the United States and Canada). The study is evaluating the combination of efti with MSD’s KEYTRUDA (pembrolizumab) in up to 183 patients with second line head and neck squamous cell carcinoma or non-small cell lung cancer in first and second line.

The trial is a Phase II, Simon’s two-stage, non-comparative, open-label, single-arm, multicentre clinical study that is taking place in study centres across Australia, Europe, the UK and US.

Patients participate in one of the following:
• Part A – First line Non-Small Cell Lung Cancer (NSCLC), PD-X naive
• Part B – Second line NSCLC, PD-X refractory
• Part C – Second line Head and Neck Squamous Cell Carcinoma (HNSCC), PD-X naive

TACTI-002 is an all-comer study in terms of PD-L1 status, a well-known predictive marker for response to pembrolizumab monotherapy especially in NSCLC and HNSCC. PD-L1 expression is typically reported in three groups for NSCLC: < 1%, 1-49% and ≥ 50% (Tumour Proportion Score or TPS) and in HNSCC: < 1, 1-19 and ≥ 20 (Combined Positive Score or CPS). Patients with a high PD-L1 status are typically more responsive to anti-PD-1 therapy such as pembrolizumab, whereas those with low PD-L1 status are overall significantly less responsive.

On June 4, 2021, Caladrius Biosciences, Inc., a Delaware corporation (the "Company"), reported that it entered into an At The Market Offering Agreement, dated June 4, 2021 (the "ATM Agreement") with H.C. Wainwright & Co., LLC ("Wainwright"), as sales agent, in connection with an "at the market offering" under which the Company from time to time may offer and sell shares of its common stock, par value $0.001 per share (the "Common Stock"), having an aggregate offering price of up to $50,000,000 (the "Shares") (Filing, 8-K, Caladrius Biosciences, JUN 4, 2021, View Source [SID1234583632]). Shares sold under the ATM Agreement will be offered and sold pursuant to the Company’s Registration Statement on Form S-3, which was initially filed on April 1, 2021 and which was declared effective by the Securities and Exchange Commission (the "SEC") on May 4, 2021 (Registration No. 333-254971) (the "Registration Statement") and a prospectus supplement that the Company expects to file with the SEC relating to the Shares shortly after the filing of this Current Report on Form 8-K.

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This Current Report on Form 8-K shall not constitute an offer to sell or the solicitation of an offer to buy the Shares, nor shall there be any offer, solicitation or sale of the Shares in any state or country in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or country.

The opinion of the Company’s counsel regarding the validity of the Shares is filed as Exhibit 5.1 to this Current Report on Form 8-K. This opinion is also filed with reference to, and is hereby incorporated by reference into, the Registration Statement.

The Company cautions you that statements included in this Current Report on Form 8-K that are not a description of historical facts are forward-looking statements. These forward-looking statements include statements regarding the Company’s ability to sell Shares pursuant to the ATM Agreement. The inclusion of forward-looking statements should not be regarded as a representation by the Company that any of these statements, results or sales will be achieved or completed due in part to risks and uncertainties inherent in the Company’s business, including those described in the Company’s Form 10-K for the year ended December 31, 2020 filed with the SEC on February 25, 2021. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof, and the Company undertakes no obligation to revise or update this report to reflect events or circumstances after the date hereof. All forward-looking statements are qualified in their entirety by this cautionary statement. This caution is made under the safe harbor provisions of Section 21E of the Private Securities Litigation Reform Act of 1995.

On June 4, 2021 SQZ Biotechnologies Company (NYSE: SQZ), focused on unlocking the full potential of cell therapies for multiple therapeutic areas, reported initial results from its ongoing Phase 1 clinical trial of SQZ-PBMC-HPV demonstrating that the investigational cell therapy is safe and well-tolerated and can stimulate immune responses in certain patients with advanced or metastatic Human Papillomavirus positive (HPV16+) tumors (Press release, SQZ Biotech, JUN 4, 2021, View Source [SID1234583627]). The trial also showed that the company’s clinical stage manufacturing process of its autologous cell therapy is fast and reliable. The monotherapy stage trial data of the company’s first Antigen Presenting Cell (APC) platform candidate was presented at the 2021 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) annual meeting; poster presentation 2536.

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"Our vision is to make cell therapies that are safe and available with rapid turnaround times, allowing access to patients who need them," said Oliver Rosen, M.D., chief medical officer at SQZ Biotechnologies. "The company’s first-in-human data of a cell-based therapeutic vaccine are encouraging and an important first step towards validation of our directed immunity approach. Within this small trial of patients with very advanced disease, four patients who had progressed after multiple prior therapies achieved stable disease. These early outcomes, combined with encouraging safety data and fast clinical-scale manufacturing times, support our plans to initiate the trial’s safety combination phase with immune checkpoint inhibitors."

Safety & Tolerability

A primary outcome measure in the monotherapy dose escalation phase of the trial is safety and tolerability. Findings from the trial show that SQZ-PBMC-HPV was safe and well-tolerated at all tested dose levels with patients receiving 2 to 10 doses. No dose-limiting toxicities were observed.

"Overall, SQZ-PBMC-HPV has been safe and well tolerated by patients, even advanced patients as we have seen in this study," said study author Antonio Jimeno, M.D., Ph.D., Professor of Medicine, Oncology and Otolaryngology, University of Colorado School of Medicine, and Co-Leader, Development Therapeutics Program, University of Colorado Cancer Center. "I look forward to completing the single agent portion of the trial and advancing into the combinations of SQZ-PBMC-HPV with immunotherapies."

There were no grade 3 or higher treatment related serious adverse events (SAEs). In one patient, a grade 2 cytokine release syndrome and immune-related reaction was observed. A related grade 3 adverse event (AE, anemia) was observed in another patient.

Manufacturability

Manufacturing feasibility is a secondary outcome measure in the monotherapy phase of the trial. All patient batches were produced under current good manufacturing practice regulations, met specifications, and yielded multiple cryopreserved doses in less than 24 hours.

The findings show that doses of SQZ-PBMC-HPV were released and available for administration approximately one week from the time a patient’s cells were drawn. Antigen presentation was confirmed in all patient batches independent of individual patient medical history or prognostic score.

Patient Characteristics & Immune Response Biomarkers

The clinical trial enrolled patients with HPV16+ cancers progressing after unlimited prior lines of therapy. The 12 enrolled patients had very advanced disease:

Median number of prior cancer treatments was four with one patient having received seven prior treatments

Eleven patients previously treated with an immune checkpoint inhibitor (ICI)

Six of the 12 patients had a Royal Marsden Hospital (RMH) score of 2. (RMH scores range from 0-to-3, with scores of 2 and higher predicting poor prognosis and short life expectancy)

Despite the treatment refractory status of the enrolled patients, 4 out of 6 patients with RMH scores less than 2, reflecting less advanced disease, achieved stable disease as best overall response. Two of these patients showed an increase in CD8 tumor infiltrating lymphocytes (TILs), an important biomarker in immune-oncology therapy development.

The study authors highlighted two patients – Patients 2 and 7 detailed below – which suggested that less advanced patients with lower tumor burden, such as patient two, might have a higher likelihood of clinical benefit.

Patient 2: Enrolled 3-and-half years after diagnosis and had a best overall response of progressive disease with ICI therapy. The patient had an RMH score of 1 and low tumor burden. She achieved stable disease while on the SQZ-PBMC-HPV-101 trial and remained on study for over 10 months. Image analysis of the central tumor 28 days after the first dose showed a 2-fold increase in CD8 TILs on treatment compared to baseline

Patient 7: Enrolled 1 year after diagnosis and had a partial response with chemotherapy in combination with ICI therapy but then progressed. He achieved stable disease after treatment on the SQZ-PBMC-HPV-101 trial and remained on study for three months. Image analysis of the central tumor showed a 6-fold increase in CD8 TILs on treatment compared to baseline

The company is now actively enrolling patients in the last monotherapy highest-dose cohort of the Phase 1 trial. These results will inform the dosage approach for the combination therapy phase of the clinical trial with immune checkpoint inhibitors.

Poster Presentation Details

Title: Initial Results of a first-in-human, dose escalation study of a cell-based vaccine in HLA-A* 02+ patients with recurrent, locally advanced or metastatic HPV16+ solid tumors

First Author: Antonio Jimeno, M.D., Ph.D., University of Colorado Cancer Center

Abstract Number: 2536

Poster Session: Developmental Therapeutics — Immunotherapy

Date and Time: A copy of the poster is available on-demand via the ASCO (Free ASCO Whitepaper) virtual meeting website.

SQZ-PBMC-HPV-101 Trial Design

SQZ-PBMC-HPV is being evaluated in a Phase 1 clinical trial for the treatment of HPV16+ advanced or metastatic solid tumors. Patients must be positive for the human leukocyte antigen serotype HLA-A*02. The investigational candidate, which targets E6 and E7 oncoproteins, is being studied as a monotherapy and in combination with immuno-oncology agents. The study’s primary outcome measures in the monotherapy and combination phases of the trial include safety and tolerability. Antitumor activity is a secondary outcome measure in both the monotherapy and combination stages of the trial, and manufacturing feasibility is a secondary outcome measure in the monotherapy phase of the trial. The monotherapy phase of the study includes escalating dose cohorts with a DLT window of 28 days and the definition of a recommended phase 2 dose. The planned safety combination phase of the study will include SQZ-PBMC-HPV and checkpoint inhibitors that have previously received regulatory approval. DLT will be measured over 42 days in the safety combination phase.

About Human Papillomavirus Positive Cancers

Human papillomavirus (HPV) is one of the most common viruses worldwide and certain strains persist for many years leading to cancer. According to the Centers for Disease Control (CDC), in the United States HPV+ tumors represent 3% of all cancers in women and 2% of all cancers in men, resulting in over 39,000 new cases of HPV+ tumors every year. HPV infection is larger outside of the U.S., and according to the International Journal of Cancer HPV+ tumors account for 4.5% of all cancers worldwide, resulting in approximately 630,000 new cases every year. According to the CDC, HPV infection plays a significant role in the formation of more than 90% of anal and cervical cancers, and most cases of vaginal (75%), oropharyngeal (70%), vulval (70%) and penile (60%) cancers.

On June 4, 2021 Harpoon Therapeutics, Inc. (NASDAQ: HARP), a clinical-stage immunotherapy company developing a novel class of T cell engagers, reported a pipeline update on its four clinical stage programs, including updating the interim data presented earlier at ASCO (Free ASCO Whitepaper) from the ongoing dose escalation portion of the Phase 1/2a trial for HPN424 in patients with metastatic castration resistant prostate cancer (mCRPC) (Press release, Harpoon Therapeutics, JUN 4, 2021, View Source [SID1234583615]). Harpoon has four product candidates in clinical trials that are based on its proprietary Tri-specific T cell Activating Construct (TriTAC) platform designed to recruit a patient’s own immune cells to kill tumor cells.

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"We are excited by the clinical data emerging from our four TriTAC programs that are showing tumor size reductions or stable disease, meaningful treatment duration, clinical activity, target engagement, extended half-life, and manageable safety and tolerability profiles in the heavily pretreated patient populations," stated Jerry McMahon, Ph.D., President and CEO, Harpoon Therapeutics. "As we continue to advance to higher doses in each of these programs, we look forward to the initiation of expansion cohorts this year."

"The clinical signals observed in the HPN424 trial and the unconfirmed partial response in the recently initiated HPN328 trial are very encouraging," said Natalie Sacks, M.D., Chief Medical Officer of Harpoon. "Looking across the portfolio, we are encouraged by how our novel technology is performing across multiple tumor types. We are seeing initial signs of clinical activity while effectively managing cytokine-mediated adverse events."

Dose escalation and step dosing for HPN424 Phase 1/2a clinical trial continuing.
As of May 31, 2021, the data cutoff date for the Company’s HPN424 presentation, the Company updated the ASCO (Free ASCO Whitepaper) interim data to describe newly enrolled patients and additional follow-up on existing patients already enrolled in the 300 ng/kg step dose cohort. The company has examined several step dosing regimens in this cohort and had the following observations:

Eight patients most recently enrolled in this cohort were treated with the same modified step dose regimen. Preliminary data from these patients include 3/8 (38%) with PSA declines that occur early in the course of treatment.

For the total 19 patients enrolled in this cohort, 4/19 showed PSA declines, including two patients with PSA30.
The ASCO (Free ASCO Whitepaper) poster presentation, included the following observations:

Antitumor activity includes a confirmed PR per RECIST, PSA declines and CTC reductions.
Fifteen of 74 (20%) pts with >1 post-baseline value had PSA decreases from baseline ranging from -2% to -76%, including 4 pts with PSA50 response and 2 pts with PSA30 response
Treatment duration > 24 weeks observed in 15 of 74 (20%) pts, including 8 of 17 (47%) chemo-naïve patients
Reduction in CTCs was seen in 36 of 64 (56%) patients with available baseline and on-treatment CTC counts
CRS has been transient and manageable with 4% of patients experiencing Grade 3 CRS
CRS and transaminitis events observed most often in Cycle 1, with diminished frequency and severity in subsequent cycles
Introduction of step dose regimens has allowed for the administration of higher target doses, currently at 300ng/kg
HPN536 (mesothelin TriTAC) Phase 1/2a clinical trial continues dose escalation. Dosing has occurred across 10 fixed-dose cohorts of 6 to 560ng/kg and three step dose cohort up to 1200ng/kg, with total enrollment of 60 patients. Tumor types treated include late-stage ovarian (47%), pancreatic (40%) and peritoneal and pleural mesothelioma (13%) cancers. Pharmacokinetic analysis shows median half-life of more than 70 hours for HPN536. Among the relapsed/refractory ovarian cancer patients with at least one post-baseline scan, 11 of 20 (55%) patients showed stability of target lesions, including three patients with target lesion shrinkage. In addition, five of 27 (19%) ovarian cancer patients had a duration of treatment of greater than 24 weeks. As of May 31, 2021, MTD has not been reached. The Company expects to present interim data at a medical conference in 2021.

Dose escalation for HPN217 (BCMA TriTAC) Phase 1/2 clinical trial making good progress. Relapsed/refractory multiple myeloma patients (N=20) have been treated across eight fixed dose cohorts of 5 to 2150 µg weekly, reflecting rapid dose expansion since the trial began. HPN217 has been well tolerated, and no DLTs have been observed as of the May 10, 2021 cutoff date. Pharmacokinetic analysis shows half-life extension to support at least once weekly dosing. A presentation of interim data is anticipated as well as initiation of a dose expansion cohort in the second half of 2021.

Dose escalation for HPN328 (DLL3 TriTAC) Phase 1/2 clinical trial initiated in late 2020 and has shown rapid progress. The first single patient cohort began with a flat dose of 15µg of HPN328 administered once weekly by intravenous infusion and has proceeded to the fourth cohort at a dose of 405µg. Eligible patients include small cell lung cancer patients who have relapsed after platinum chemotherapy and patients with other tumors associated with DLL3 expression. An unconfirmed partial response has been observed for one patient with small cell lung cancer from the 45µg dose cohort. Presentation of initial interim data is planned for the second half of 2021.

IND-enabling studies for HPN601 (EpCAM ProTriTAC) are progressing as planned. HPN601 is a conditionally active T cell engager based on the ProTriTAC platform. EpCAM is expressed in a broad range of solid tumors, including gastrointestinal cancers, potentially enabling HPN601 to address multiple indications with high unmet medical need.

Conference Call and Webcast Today

Harpoon’s management will host a webcast and conference call at 4 p.m. ET / 1 p.m. PT on Friday, June 4, 2021 to review the data presented at ASCO (Free ASCO Whitepaper) and provide an update on its other pipeline programs. The live call may be accessed by dialing 866-951-6894 for domestic callers or 409-216-0624 for international callers and using conference ID # 2657278.

A live webcast of the call will be available from the Events and Presentations section of the company’s website at View Source and will be archived there shortly after the live event.