FDA Lifts Clinical Hold so MYC Inhibitor APTO-253 Can Return to Phase 1b Trial In Patients With Hematologic Cancers

On June 29, 2018 Aptose Biosciences Inc. (NASDAQ:APTO) (TSX:APS) reported that the U.S. Food and Drug Administration (FDA) has notified the company that it has lifted the clinical hold on APTO-253, Aptose’s investigational drug for hematologic cancers (Press release, Aptose Biosciences, JUN 29, 2018, View Source;p=RssLanding&cat=news&id=2356603 [SID1234527515]). APTO-253 is the only known clinical-stage molecule that has the potential to directly inhibit expression of the MYC oncogene, shown to be a causative factor in many malignancies, including acute myeloid leukemia (AML).

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Up to fifteen clinical centers are expected to participate in the Phase 1b trial, and the screening and dosing will resume as soon as practicable for patients with relapsed or refractory AML or with high risk myelodysplastic syndromes (MDS). Recent data also highlight the role of MYC gene dysregulation in B-cell malignancies1, and Aptose hopes to pursue this patient population in the coming months.

The Phase 1b trial of APTO-253 had been placed on clinical hold as a consequence of an event that occurred at a clinical site with the infusion procedure. Ultimately, a root cause investigation determined that the event resulted from chemistry and manufacturing based issues, all of which were incorporated into a Chemistry, Manufacturing and Control (CMC) amendment to the Investigational New Drug (IND) application.

"We are eager to return APTO-253 back into the clinic," said William G. Rice, Ph.D., Chairman, President and Chief Executive Officer. "Our understanding of this molecule has evolved dramatically, and we are excited to deliver a MYC gene expression inhibitor to patients with debilitating hematologic malignancies."

About the Study

The Phase 1b, multicenter, open-label, dose-escalation clinical trial of APTO-253 is designed to assess the safety, tolerability, pharmacokinetics and pharmacodynamic responses and efficacy of APTO-253 as a single agent and determine the recommended Phase 2 dose. APTO-253 will be administered once weekly, over a 28-day cycle. The dose escalation cohort of the study could potentially enroll up to 20 patients with relapsed or refractory acute myeloid leukemia (AML) or high-risk myelodysplastic syndromes (MDS). The study is designed to then transition, as appropriate, to single-agent expansion cohorts in AML and MDS.

MYC dysregulation is a common driver in many malignancies, making it an attractive therapeutic target. Repression of MYC expression by bromodomain (BET) inhibitors has proven effective at triggering apoptosis in leukemia cells; however, inhibition of bromodomain proteins can cause severe toxicities and myelosuppression due to the presence of bromodomain proteins on all active genes. Unlike BET inhibitors and other cancer chemotherapies, APTO-253 acts through a distinct targeted mechanism. As a first in class, small molecule MYC inhibitor, APTO-253 may be particularly appropriate for the management of patients having AML and other hematologic malignancies with compromised bone marrow function. Earlier this month, Aptose announced the publication of preclinical data further elucidating the mechanism of action of APTO-253 (here).

About APTO-253

APTO-253 is a clinical-stage small molecule targeted therapeutic agent that inhibits expression of the MYC oncogene, leading to cell cycle arrest and programmed cell death (apoptosis) in human-derived solid tumor and hematologic cancer cells. The MYC oncogene is overexpressed in hematologic cancers, including acute myeloid leukemia (AML). Aptose researchers have reported the ability of APTO-253 to induce cell death, or apoptosis, in multiple blood cancer cell lines including AML, as well as in vitro synergy with various classes of conventional approved and investigational therapies for AML or myelodysplastic syndromes (MDS). New findings reveal that APTO-253 might also serve certain solid tumor patients with BRCA1/2 mutations, but without causing toxicity to the normal bone marrow functions.

Combination Therapy BRAFTOVI (encorafenib) and MEKTOVI (binimetinib) for the Treatment of BRAF-mutant Melanoma, Available for Order at Biologics, Inc.

On June 29, 2018 Biologics, Inc., a McKesson Specialty Health oncology, neurology and complex care pharmacy services company, has been selected by Array BioPharma, Inc. to be in the limited distribution network for the combination therapy BRAFTOVITM (encorafenib) and MEKTOVI (binimetinib) for the treatment of patients with unresectable or metastatic melanoma with a BRAFV600E or BRAFV600K mutation, as detected by a U.S. Food and Drug Administration (FDA) approved test (Press release, Biologics, JUN 29, 2018, View Source [SID1234527519]).

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"Advanced BRAF-mutant melanoma is a serious and deadly type of skin cancer. Nearly half of melanoma patients who are diagnosed with the cancer after it has already spread have the BRAF mutation," said Brandon Tom, VP, Commercial Services, McKesson Specialty Health. "BRAFTOVI and MEKTOVI represent an important new targeted treatment, and we are looking forward to helping to bring this new option to the metastatic melanoma community."

BRAFTOVI and MEKTOVI were approved by the FDA on June 27, 2018 based on clinical data from the Phase 3 COLUMBUS trial, published in the Lancet Oncology.1 More information about these products can be found at www.braftovimektovi.com.

Metastatic melanoma is the most life-threatening type of skin cancer and is associated with low survival rates. 2,3 Approximately half of the estimated 200,000 new cases of melanoma diagnosed worldwide each year have BRAF mutations, a key target in the treatment of metastatic melanoma. 2,4,5

Biologics’ oncology specialty pharmacy is committed to providing patient-centric care throughout the patient’s cancer journey. The company is recognized across the industry for its high level of customer service and its innovative high-touch patient care model that supports patients with a multidisciplinary care team. Each team includes a pharmacist with in-depth knowledge of oncology pharmaceuticals, an experienced oncology nurse and a financial counselor who is familiar with various financial assistance programs and organizations that help cancer patients. This highly skilled care team works together to develop individualized care plans that address each patient’s unique clinical, financial and emotional needs and that streamline communication back to the treating provider, empowering high-quality care and optimal outcomes.

Physicians may submit prescriptions to Biologics via phone (800-850-4306), fax (800-823-4506) or eScribe. For electronic prescribing systems, physicians may search for Biologics within their EMR system.

Novartis receives positive CHMP opinion for Kymriah® for treating two aggressive blood cancers, marking important medical advance for patients in Europe

On June 29, 2018 Novartis reported that the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) adopted a positive opinion recommending approval of Kymriah (tisagenlecleucel, formerly CTL019) – a novel one-time treatment that uses a patient’s own T cells to fight cancer (Press release, Novartis, JUN 29, 2018, View Source [SID1234527508]). The positive opinion includes two B-cell malignancies: B-cell acute lymphoblastic leukemia (ALL) that is refractory, in relapse post-transplant or in second or later relapse in patients up to 25 years of age; and diffuse large B-cell lymphoma (DLBCL) that is relapsed or refractory (r/r) after two or more lines of systemic therapy in adults.

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"The positive CHMP opinion for Kymriah is a watershed moment for pediatric and adult patients in Europe with aggressive blood cancers," said Liz Barrett, CEO, Novartis Oncology. "This truly transformative therapy helps address a profound unmet need, and Novartis is proud that our leadership in CAR-T innovation will make a meaningful difference to patients in the EU."

If approved by the European Commission, Kymriah will be the first CAR-T cell therapy available in the European Union (EU) for both DLBCL and B-cell ALL.

Both B-cell ALL and DLBCL are aggressive malignancies with significant treatment gaps for patients. In Europe, ALL accounts for approximately 80% of leukemia cases among children[1], and for those patients who relapse, the outlook is poor[2]. This low survival rate is in spite of patients having to undergo multiple treatments, including chemotherapy, radiation, targeted therapy or stem cell transplant, and further highlights the need for new treatment options. DLBCL is the most common form of non-Hodgkin lymphoma, accounting for up to 40% of all cases globally[3]. For patients who relapse or don’t respond to initial therapy, there are limited treatment options that provide durable responses, and survival rates are low for the majority of patients due to ineligibility for autologous stem cell transplant (ASCT) or because salvage chemotherapy or ASCT have failed[4].

The positive CHMP opinion is based on two pivotal Novartis-sponsored global, multi-center, Phase II trials, ELIANA and JULIET, which included patients from Europe, the US, Australia, Canada and Japan.

The collaboration of Novartis and the University of Pennsylvania has led to historic milestones in CAR-T cell therapy since 2012, including the initiation of the first global CAR-T trials, the PRIME designation granted by the EMA for Kymriah in pediatric patients with r/r B-cell ALL, and the approval of Kymriah in two distinct indications by the US Food and Drug Administration (FDA).

"Kymriah is already transforming the way we treat certain types of leukemia and lymphoma in the United States, and showing us that personalized cell therapies are an incredibly powerful tool in the fight against cancer," said Carl June, MD, the Richard W. Vague Professor in Immunotherapy in the department of Pathology and Laboratory Medicine and director of the Center for Cellular Immunotherapies in the Abramson Cancer Center. "We are excited to see that through our collaboration with Novartis, physicians in more countries around the world may be able to use this novel and innovative CAR-T cell therapy to improve the treatment outcomes for their patients."

ELIANA is the first pediatric global CAR-T cell therapy registration trial, treating patients in 25 centers in the US, Canada, Australia, Japan and the EU, including: Austria, Belgium, France, Germany, Italy, Norway and Spain. JULIET is the first multi-center global registration study for Kymriah in adult patients with r/r DLBCL.

JULIET is also the largest global study evaluating a CAR-T cell therapy in patients with DLBCL, enrolling patients from 27 sites in 10 countries across the US, Canada, Australia, Japan and the EU, including: Austria, France, Germany, Italy, Norway and the Netherlands.

The Novartis CAR-T cell manufacturing platform includes cryopreservation, the process of freezing patients’ harvested cells in order to preserve them, which provides physicians with the flexibility to decide when to initiate both the harvesting of patients’ cells and the infusion of Kymriah, based on each patient’s condition, and allows for this individualized treatment approach on a global scale.

"Today’s positive opinion from the CHMP marks a truly extraordinary moment for those who have been impacted by these types of advanced and aggressive B-cell malignancies," said Dr. Ulrich Jäger, Professor of Hematology at the Medical University of Vienna and Head of Hematology at the General Hospital of the City of Vienna. "European patients and doctors have been anxiously awaiting the introduction of Kymriah, which will bring a significant advancement in the treatment landscape for these patients who face a poor prognosis."

The European Commission will now review the CHMP recommendation to deliver its final decision, applicable to all 28 EU member states, plus Iceland, Liechtenstein and Norway.

"This CHMP decision brings an innovative option closer to European patients who have exhausted most alternative treatments," said Zack Pemberton-Whiteley, Chair of the Global Acute Leukemia Advocates Network and Campaigns and Advocacy Director at Leukaemia Care. "It’s important to note that CAR-T therapy may be suitable for a limited group of patients. Working with healthcare professionals to ensure safe and timely access for those who need it will be of paramount importance."

Additional regulatory filings are under review for Kymriah in Canada, Switzerland, Australia and Japan.

About CAR-T
CAR-T is different from typical small molecule or biologic therapies because it is manufactured for each individual patient using their own cells. During the treatment process, T cells are drawn from a patient’s blood and reprogrammed in the laboratory to create T cells that are genetically coded to recognize and fight the patient’s cancer cells and other B cells expressing a particular antigen.

Novartis Leadership in Immuno-Oncology
Novartis is at the forefront of investigational immunocellular therapy as the first pharmaceutical company to initiate global CAR-T trials, and has significantly invested in CAR-T research and worked with pioneers in the field. Kymriah, the first approved CAR-T cell therapy, is the cornerstone of this strategy. Active research programs are underway targeting other hematologic malignancies and solid tumors, and include efforts focused on next generation CAR-Ts with evolved manufacturing schemes and gene edited cells.

Kymriah (tisagenlecleucel, formerly CTL019) Important Safety Information from the US Prescribing Information
Kymriah is currently only approved in the United States.

Kymriah is made from your own white blood cells and is a prescription cancer treatment used in patients up to 25 years old who have acute lymphoblastic leukemia (ALL) that is either relapsing (went into remission, then came back) or refractory (did not go into remission after receiving other leukemia treatments). It is also used in patients with certain forms of large B-cell lymphoma that have relapsed or are refractory after having at least two other kinds of treatment.

Kymriah may cause side effects that are severe or life threatening, such as Cytokine Release Syndrome (CRS) or Neurological Toxicities. Patients with CRS may experience symptoms including difficulty breathing, fever (100.4’F/38’C or higher), chills/shaking chills, severe nausea, vomiting and diarrhea, severe muscle or joint pain, very low blood pressure, or dizziness/lightheadedness. Patients may be admitted to the hospital for CRS and treated with other medications.

Patients with neurological toxicities may experience symptoms such as altered or decreased consciousness, headaches, delirium, confusion, agitation, anxiety, seizures, difficulty speaking and understanding, or loss of balance. Patients should be advised to call their healthcare provider or get emergency help right away if they experience any of these signs and symptoms of CRS or neurological toxicities.

Because of the risk of CRS and neurological toxicities, Kymriah is only available through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS) called Kymriah REMS.

Serious allergic reactions, including anaphylaxis, may occur after Kymriah infusion.
Kymriah can increase the risk of life-threatening infections that may lead to death. Patients should be advised to tell their healthcare provider right away if they develop fever, chills, or any signs or symptoms of an infection.

Patients may experience prolonged low blood cell counts (cytopenia), where one or more types of blood cells (red blood cells, white blood cells, or platelets) are decreased. The patient’s healthcare provider will do blood tests to check all of their blood cell counts after treatment with Kymriah. Patients should be advised to tell their healthcare provider right away if they get a fever, are feeling tired, or have bruising or bleeding.

Patients may experience hypogammaglobulinemia, a condition in which the level of immunoglobulins (antibodies) in the blood is low and the risk of infection is increased. It is expected that patients may develop hypogammaglobulinemia with Kymriah, and may need to receive immunoglobulin replacement for an indefinite amount of time following treatment with Kymriah. Patients should tell their healthcare provider about their treatment with Kymriah before receiving a live virus vaccine.

After treatment with Kymriah, patients will be monitored lifelong by their healthcare provider, as they may develop secondary cancers or recurrence of their cancer.

Patients should not drive, operate heavy machinery, or do other dangerous activities for eight weeks after receiving Kymriah because the treatment can cause temporary memory and coordination problems, including sleepiness, confusion, weakness, dizziness, and seizures.

Some of the most common side effects of Kymriah are difficulty breathing, fever (100.4°F/38°C or higher), chills/shaking chills, confusion, severe nausea, vomiting and diarrhea, severe muscle or joint pain, very low blood pressure, dizziness/lightheadedness, and headache. However, these are not all of the possible side effects of Kymriah. Patients should talk to their healthcare provider for medical advice about side effects.

Prior to a female patient starting treatment with Kymriah, their healthcare provider may do a pregnancy test. There is no information available for Kymriah use in pregnant or breast-feeding women. Therefore, Kymriah is not recommended for women who are pregnant or breast feeding. Patients should talk to their healthcare provider about birth control and pregnancy.

Patients should tell their healthcare provider about all the medicines they take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.

After receiving Kymriah, patients should be advised that some commercial HIV tests may cause a false-positive test result. Patients should also be advised not to donate blood, organs, or tissues and cells for transplantation after receiving Kymriah.

Please see the full Prescribing Information for Kymriah, including Boxed WARNING, and Medication Guide at www.Kymriah.com

Disclaimer
This press release contains forward-looking statements within the meaning of the United States Private Securities Litigation Reform Act of 1995. Forward-looking statements can generally be identified by words such as "potential," "can," "will," "plan," "expect," "anticipate," "look forward," "believe," "committed," "investigational," "pipeline," "launch," "under review," "strategy," "underway," "next-generation," or similar terms, or by express or implied discussions regarding potential marketing approvals, new indications or labeling for Kymriah and the other investigational or approved products described in this press release, regarding our ability to scale and sustain commercial manufacturing for Kymriah and such other products, or regarding potential future revenues from Kymriah and such other products. You should not place undue reliance on these statements. Such forward-looking statements are based on our current beliefs and expectations regarding future events, and are subject to significant known and unknown risks and uncertainties. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those set forth in the forward-looking statements. There can be no guarantee that Kymriah or the other investigational or approved products described in this press release will be submitted or approved for sale or for any additional indications or labeling in any market, or at any particular time. Neither can there be any guarantee that Novartis will successfully scale and sustain commercial manufacturing for Kymriah or the other products described in this press release, or successfully sustain a network of treatment centers to offer Kymriah or such other products. Nor can there be any guarantee that Kymriah or such other products will be commercially successful in the future. In particular, our expectations regarding such products could be affected by, among other things, our ability to successfully scale and sustain commercial manufacturing and sustain a network of treatment centers; the uncertainties inherent in research and development, including clinical trial results and additional analysis of existing clinical data; regulatory actions or delays or government regulation generally; global trends toward health care cost containment, including government, payer and general public pricing and reimbursement pressures; our ability to obtain or maintain proprietary intellectual property protection; the particular prescribing preferences of physicians and patients; general political and economic conditions; safety, quality or manufacturing issues; potential or actual data security and data privacy breaches, or disruptions of our information technology systems, and other risks and factors referred to in Novartis AG’s current Form 20-F on file with the US Securities and Exchange Commission. Novartis is providing the information in this press release as of this date and does not undertake any obligation to update any forward-looking statements contained in this press release as a result of new information, future events or otherwise.

Actinium Announces New Clinical Trial to Study Effect of Actimab-A on Minimal Residual Disease in Postremission AML Patients

On June 28, 2018 Actinium Pharmaceuticals, Inc. (NYSE AMERICAN:ATNM) ("Actinium" or "the Company"), reported that Dr. Joseph Jurcic, Director of the Hematologic Malignancies Section and Professor of Medicine at Columbia University Medical Center, has initiated Actimab-A MRD, a new clinical trial for patients with AML who are in remission but have detectable minimal residual disease (MRD) (Press release, Actinium Pharmaceuticals, JUN 28, 2018, View Source [SID1234527514]). The trial will study the safety/tolerability of Actimab-A in the postremission consolidation setting and include dose finding analyses. The trial will also study the impact of Actimab-A on minimal residual disease (MRD) as well as progression-free (PFS) and overall survival (OS) rates. The investigational new drug (IND) application for this trial has been cleared by the FDA.

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Together with Dr. Jurcic, Actinium will host a webcast to discuss the planned trial, participation information is as follows:

Date: July 10, 2018
Time: 8:00 AM ET
Registration Link: View Source
Telephone participation: U.S./Canada Toll Free: (855) 427-0225 or (718) 865-8336
Conference ID: 2540

Dr. Joseph Jurcic said, "Although patients with AML can achieve complete remissions with induction therapy, the rate of relapse remains high resulting in high mortality rates. Strong evidence exists that minimal residual disease is a major driver of disease relapse and clearly demonstrates the need for improved consolidation therapies that can effectively target MRD. Based on the clinical profile of Actimab-A to date, I am excited to study this therapy for use as a consolidation therapy. It will be a significant advancement for AML patients if this trial shows the ability to target MRD and reduce relapse rates."

There are an estimated 21,000 patients diagnosed with AML annually in the United States and over 350,000 cases of AML worldwide. According to the National Cancer Institute, 5-year survival for AML patients under age 65 is 45% while 5-year survival for patients over 65 is 6% with the median age of diagnosis of AML patients being 68. With curative intent induction chemotherapy, 45% – 65% of patients can achieve complete remission but up to 80% of patients will relapse despite postremission consolidation treatment. Currently, non-transplant-based consolidation therapies consist mainly of chemotherapy such as high-dose Cytarabine. The presence of MRD has been shown to be associated with higher rates of relapse and earlier relapse in multiple studies. Recently, the FDA approved a therapy for patients with a certain type of B-cell leukemia who are in remission but have detectable MRD.

Dr. Mark Berger, Actinium’s Chief Medical Officer said, "Actimab-A has many points of differentiation that I feel make it well suited to address MRD treatment as consolidation therapy. Given that patients receive chemotherapy as induction therapy, I believe it is important to develop a non-chemotherapy based consolidation therapy that has fewer toxicities and side effects than chemotherapy. This is particularly important for older patients, who do not have the same ability to tolerate high dose therapies as young patients, and who are the majority of patients with AML. We believe our ARC or Antibody Radiation Conjugate approach enables precision targeting of residual AML cells and potentially provide a means by which MRD can be eliminated and relapse rates lowered. We look forward to working with Dr. Jurcic to execute this important trial for AML patients."

Sandesh Seth, Actinium’s Chairman and CEO said, "We are excited by the continued expansion of our CD33 program and intend to solidify our position as the best-in-class CD33 targeting therapy by demonstrating its potential in multiple diseases and multiple indications. Expansion into the consolidation setting is an important achievement towards this end. Further, the application of our therapy for MRD, strategically aligns us with the forefront of scientific exploration in a clinical setting. We believe the breadth of our CD33 program is unmatched given that we are now studying our ARC not only in multiple AML settings including induction, consolidation and in relapsed/refractory disease but also in multiple myeloma as a therapeutic, and in MDS as targeted conditioning to enable a bone marrow transplant. With this important trial poised to start and clinical data expected from our ongoing trials, we are confident in our ability to realize the intrinsic value of this program and advance these trials to benefit the greatest number of patients."

About Actimab-A
Actimab-A is an antibody radio-conjugate (ARC) comprised of the anti-CD33 monoclonal antibody lintuzumab labeled with the radioisotope actinium-225. CD33 is a marker expressed on AML cells of virtually all affected patients. Actimab-A has been studied in over 100 patients to date and is the only CD33 targeting agent being studied in a broad range of diseases in which the CD33 antigen is expressed, including AML, myelodysplastic syndrome (MDS) and multiple myeloma.

Actinium-225 is highly differentiated radioisotope that emits high amounts of energy through the release of four alpha-particles that can cause double-stranded breaks in DNA with known resistance mechanisms to Actinium-225. Given the limited distance of its energy in the body, it is potentially sparing of non-targeted cells leading to better tolerability and less toxicities.

Actimab-A has been granted Orphan Drug Designation from both the U.S. Food and Drug Administration and the European Medicines Agency for newly diagnosed AML in patients age 60 and above.

Corvus Pharmaceuticals Announces Publication of Preclinical Study Results Demonstrating CPI-444 Antitumor Activity as Monotherapy and in Combination with Anti-PD-1 Therapy in Cancer Immunology, Immunotherapy

On June 28, 2018 Corvus Pharmaceuticals, Inc. (NASDAQ:CRVS), a clinical-stage biopharmaceutical company focused on the development and commercialization of precisely targeted oncology therapies, reported publication of results of preclinical studies of CPI-444 conducted by researchers at Johns Hopkins University School of Medicine (Press release, Corvus Pharmaceuticals, JUN 28, 2018, View Source;p=RssLanding&cat=news&id=2356398 [SID1234527496]). The data showed that CPI-444 administered as monotherapy suppressed tumor growth and improved survival in animal tumor models, and CPI-444 administered in combination with anti-PD-1 therapy dramatically improved antitumor immune responses over either agent used alone. The results were published online this month in the journal Cancer Immunology, Immunotherapy (CII), in a publication titled "Inhibition of the adenosine A2a receptor modulates expression of T cell coinhibitory receptors and improves effector function for enhanced checkpoint blockade and ACT (adoptive cellular therapy) in murine cancer models," and can be accessed here.

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CPI-444, Corvus’ lead product candidate, is a selective and potent inhibitor of the adenosine A2A receptor. It is currently being evaluated in early-stage clinical trials in patients with various solid tumors as a single agent and in combination with Genentech’s atezolizumab, an anti-PD-L1 antibody.

"These newly published studies add to the growing scientific and clinical evidence of the importance of the adenosine pathway in modulating immune responses in cancer. The results provide further evidence that the A2A receptor may serve as a crucial regulator of immune response, and confirms the potential of CPI-444 in cancer therapy," said Richard A. Miller, M.D., an oncologist and co-founder, president and chief executive officer of Corvus. "CPI-444 has been studied in more than 250 patients to date both as a monotherapy and in combination with an anti-PD-L1 antibody. To our knowledge, it is the only A2A receptor antagonist to reproducibly show anti-tumor activity as a monotherapy in preclinical and clinical studies. We are currently enrolling patients in a Phase 1/1b trial in renal cell cancer and in a Phase 1b/2 trial in non-small cell lung cancer."

Results of the preclinical studies conducted by researchers at the Sidney Kimmel Comprehensive Cancer Research Center and Bloomberg~Kimmel Institute for Cancer Immunotherapy at Johns Hopkins University School of Medicine, showed that CPI-444:

Administered as monotherapy suppressed tumor growth and improved survival in two animal models of colon tumors — CT26, which is very resistant to checkpoint blockade, and MC38.
Enhanced the efficacy of anti-PD-1 immunotherapy. The combination therapy dramatically improved tumor regression and animal survival in both the CT26 and MC38 colon tumor models. The effect was particularly marked in the CT26 tumor model, which showed a 70 percent cure rate.
Dramatically enhanced immune responses in models of tumor immunity, augmented immune memory responses to viral antigens, and enhanced adoptive cellular therapy (ACT) in an animal model of melanoma.
Suppressed the expression of multiple checkpoint pathways, including PD-1, LAG-3, TIM-3 and CTLA-4, on both CD8 positive and T reg cells (which play an important role in regulating antitumor immune responses). The most significant effects were seen in tumor-draining lymph nodes.
Increased the function of killer T cells (CD8+) in tumor infiltrating cells.
ABOUT CPI-444
CPI-444 is a small molecule, oral, checkpoint inhibitor designed to disable a tumor’s ability to subvert attack by the immune system by blocking the binding of adenosine in the tumor microenvironment to the A2A receptor. Adenosine, a metabolite of ATP (adenosine tri-phosphate), is produced within the tumor microenvironment where it may bind to the adenosine A2A receptor present on immune cells and block their activity. CD39 and CD73 are enzymes on the surface of tumor cells and immune cells. These enzymes work in concert to convert ATP to adenosine. In vitro and preclinical studies have shown that dual blockade of CD73 and the A2A receptor may be synergistic.