On April 21, 2026 Moleculin Biotech, Inc., (Nasdaq: MBRX) ("Moleculin" or the "Company"), reported that an abstract highlighting data on its lead drug candidate, annamycin, has been accepted for poster presentation at the 2026 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting, taking place May 29 – June 2, 2026, in Chicago, Illinois.

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The abstract, titled "Cardiac safety of L-annamycin at high cumulative anthracycline exposure: Pooled analysis," will be presented in a poster session focused on Symptom Science and Palliative Care.

Presentation Details:

Session Type: Poster Session – Symptom Science and Palliative Care
Presentation Date and Time: May 30, 2026, 1:30 PM – 4:30 PM CDT
Location: Poster Board #8
The abstract presents a pooled analysis evaluating the cardiac safety profile of annamycin in patients with high cumulative exposure to anthracyclines, an important consideration given the known risk of cardiotoxicity associated with this class of chemotherapeutic agents.

"We are pleased to have this abstract accepted for presentation at ASCO (Free ASCO Whitepaper), one of the most prestigious oncology conferences globally," said Walter Klemp, Chairman and CEO of Moleculin. "These data further support the potential of annamycin as a differentiated anthracycline with a favorable cardiac safety profile, even at higher cumulative exposure levels. We look forward to sharing these findings with the oncology community."

The ASCO (Free ASCO Whitepaper) Annual Meeting is one of the largest and most influential gatherings of oncology professionals worldwide, featuring cutting-edge research and advances in cancer treatment. For more information, please visit asco.org.

(Press release, Moleculin, APR 21, 2026, View Source [SID1234664616])

On April 21, 2026 Medicenna Therapeutics Corp. ("Medicenna" or the "Company") (TSX: MDNA, OTCQX: MDNAF), a clinical-stage immunotherapy company focused on the development of proprietary Superkines targeting cancer and autoimmune diseases, reported new positive preclinical data from MDNA113, its first-in-class tumor-anchored and conditionally activated anti-PD-1 x IL-2 bifunctional Superkine, at the American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting 2026 in San Diego, California.

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The data demonstrate that MDNA113’s architecture delivers on the promise of a truly differentiated and highly tolerable PD-1 x IL-2 bifunctional. In a head-to-head non-human primate study, MDNA113 was well tolerated at doses up to 50 mg/kg while a representative anti-PD-1 x IL-2α-biased bispecific could not be administered a second dose at a fraction of that exposure due to severe toxicity, including evidence of vascular leak syndrome.

"Taken together, these data demonstrate that MDNA113 is a first-in-class PD-1 x IL-2 bifunctional with exquisite design that delivers superior tolerability and a significantly wider therapeutic window compared with first-generation approaches," said Fahar Merchant, Ph.D., President and CEO of Medicenna. "This is exactly the kind of data we had hoped for on our design thesis: by combining tumor anchoring, dual conditional activation, and a β-enhanced not-α IL-2 Superkine, we can dose at levels comparable to approved anti-PD-1 therapies without the systemic toxicity that has forced competitors to compromise on potency by lowering the dose and attenuating activity of IL-2. With MDNA113, we have fused a blockbuster anti-PD-1 with our IL-2 Superkine, which has already demonstrated promising single-agent activity in immunotherapy-resistant patients, significantly de-risking clinical development. We look forward to advancing MDNA113 toward an IND submission later this year."

PD-1 bispecifics have emerged as a leading next-generation approach to enhancing the efficacy of PD-1 inhibitors, the best-selling class of oncology drugs in the world. The commercial potential of PD-1 x IL-2 bispecifics specifically has been validated by recent multi-billion-dollar transactions.

MDNA113 is built on the Company’s IL-2 and IL-13 Superkine platforms. The β-enhanced not-α IL-2 Superkine at the core of MDNA113 is shared with MDNA11, the Company’s clinical-stage IL-2 Superkine, which has demonstrated durable single-agent anti-tumor activity and a manageable safety profile in the ongoing Phase 1/2 ABILITY-1 study in patients with advanced solid tumors. Unlike competing PD-1 x IL-2 programs that utilize proprietary anti-PD-1 antibodies, MDNA113 incorporates variants of commercially validated, approved human anti-PD-1 antibodies.

MDNA113 is designed to address the safety and dosing limitations that have constrained first-generation molecules in this class by combining a commercially validated anti-PD-1 antibody with Medicenna’s clinically validated IL-2 Superkine, the only next-generation IL-2 with demonstrated durable single-agent anti-tumor activity, in a tumor-targeted, conditionally activated architecture.

Key highlights from the presentation:

MDNA113’s masking architecture achieved >10,000-fold attenuation of IL-2R agonism relative to the non-masked parent molecule while preserving full PD-1/PD-L1 blockade, and the masking domain demonstrated stability in serum for at least 8 days, confirming that IL-2 Superkine is effectively shielded from systemic exposure until activated within the tumor microenvironment
MDNA113 demonstrated two independent mechanisms of conditional activation: tumor-associated matrix metalloprotease (MMP) cleavage fully restored IL-2R signaling at the tumor site, and proximity-dependent unmasking upon engagement with PD-1-expressing T cells provided a second activation pathway independent of protease expression, a key differentiator versus competing masked programs that rely solely on MMP cleavage
MDNA113’s IL-13Rα2 tumor-targeting domain drove selective accumulation and prolonged residence at the tumor site for at least 3 days in IL-13Rα2-expressing tumors, with clearance from non-expressing tissue, a tumor-anchoring capability not incorporated by any other PD-1 x IL-2 bispecific in development
In syngeneic mouse tumor models, MDNA113 demonstrated significant tumor growth inhibition with preferential expansion of CD8+ T cells expressing Granzyme B over NK cells and regulatory T cells, and efficacy was compromised with an uncleavable version, confirming conditional activation within the tumor microenvironment is required for therapeutic effect
MDNA113 was well tolerated at doses of 10, 30 and 50 mg/kg in non-human primates with pharmacokinetics consistent with approved anti-PD-1 antibodies, expanded CD8+ T cells without significant regulatory T cell increase, and did not produce dose-limiting adverse findings at any dose level tested
In a head-to-head non-human primate comparison at molar-equivalent doses, an anti-PD-1 x IL-2α-biased bispecific (1.4 mg/kg) exhibited severe toxicity after a single dose, including evidence of vascular leak syndrome, significant body weight loss, decreased serum albumin, elevated blood urea and liver enzymes, and increased white blood cell counts, and could not receive a second dose due to ongoing adverse events
By contrast, MDNA113 was well tolerated at exposures more than 30-fold higher than the single tolerated dose of the α-biased comparator and received repeat dosing without treatment-limiting findings, demonstrating a fundamentally wider therapeutic window than competing first-generation anti-PD-1 x IL-2α-biased bispecifics
A copy of the poster is available on the "Scientific Presentations" page of Medicenna’s website.

About MDNA113

MDNA113 is a novel, first-in-class tumor-targeted and tumor-activated bifunctional anti-PD-1x IL-2 Superkine with exceptionally high affinity for IL-13Rα2 without binding to the functional IL-13Rα1. IL-13Rα2 is overexpressed in a wide range of solid tumors, including "immunologically cold" tumors, with minimal to no expression in normal tissues. IL-13Rα2-expressing tumors also have abundant matrix metalloproteases in the tumor microenvironment that may efficiently activate MDNA113. IL-13Rα2 expression is associated with poor clinical outcomes in multiple tumor types including prostate, pancreatic, ovarian, liver, breast and brain cancer, with an annual worldwide incidence of over 2 million.

(Press release, Medicenna Therapeutics, APR 21, 2026, View Source [SID1234664615])

On April 21, 2026 Karyopharm Therapeutics Inc. (Nasdaq: KPTI), a commercial-stage pharmaceutical company pioneering novel cancer therapies, reported that its late-breaking abstract was accepted for an oral presentation at the 2026 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting, taking place May 29 to June 2 in Chicago. The oral presentation will feature results from the Phase 3 SENTRY trial, a randomized, double-blind, placebo-controlled trial of 60 mg selinexor in combination with ruxolitinib in myelofibrosis.

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Presentation Details:

Title: Selinexor plus ruxolitinib in JAK inhibitor–naïve myelofibrosis: Phase 3 SENTRY trial

Abstract Number: LBA6500

Session Title: Oral Abstract Session – Hematologic Malignancies—Leukemia, Myelodysplastic Syndromes, and Allotransplant

Presentation Time: June 2, 2026, 9:45 a.m. to 12:45 p.m. Central Time

Presenter: Dr. John Mascarenhas, Professor of Medicine at the Icahn School of Medicine at Mount Sinai and Director of the Center of Excellence for Blood Cancers and Myeloid Disorders
Late-breaking abstracts for presentations being held on June 2, 2026 will be released by ASCO (Free ASCO Whitepaper) on Tuesday, June 2, 2026 at 8:00 a.m. Eastern Time / 7:00 a.m. Central Time. A copy of the SENTRY presentation being delivered at ASCO (Free ASCO Whitepaper) on June 2, 2026 will be available following the event under "Publications and Presentations" in the Investor section of the Company’s website.

About the Phase 3 SENTRY Trial

SENTRY (XPORT-MF-034; NCT04562389) is a Phase 3 clinical trial evaluating a once-weekly dose of 60 mg of selinexor in combination with ruxolitinib compared to placebo plus ruxolitinib in JAKi-naïve myelofibrosis patients with platelet counts >100 x 109/L. Patients were randomized 2-to-1 to the selinexor arm. The co-primary endpoints for this trial are spleen volume reduction ≥ 35% (SVR35) at week 24 and the average change in absolute total symptom score (Abs-TSS) over 24 weeks relative to baseline.

About Myelofibrosis

Myelofibrosis is a rare blood cancer that affects approximately 20,000 patients in the United States and 17,000 patients in the European Union1. The disease causes bone marrow fibrosis (scarring in the bone marrow), which makes it difficult for the bone marrow to make healthy blood cells, splenomegaly (enlarged spleen), progressive anemia which often leads to symptoms like fatigue and weakness, and other disease associated symptoms including abdominal discomfort, pain under the left ribs, early satiety, night sweats and bone pain. The only approved class of therapies to treat myelofibrosis are JAK inhibitors, including ruxolitinib.

1. Clarivate/DRG (2023)

About XPOVIO (selinexor)

XPOVIO is a first-in-class, oral exportin 1 (XPO1) inhibitor compound for the treatment of cancer. XPOVIO functions by selectively binding to and inhibiting the nuclear export protein XPO1. XPOVIO is approved in the U.S. and marketed by Karyopharm in multiple oncology indications, including: (i) in combination with VELCADE (bortezomib) and dexamethasone (XVd) in adult patients with multiple myeloma after at least one prior therapy; (ii) in combination with dexamethasone in adult patients with heavily pre-treated multiple myeloma; and (iii) under accelerated approval in adult patients with diffuse large B-cell lymphoma (DLBCL), including DLBCL arising from follicular lymphoma, after at least two lines of systemic therapy. XPOVIO (also known as NEXPOVIO in certain countries) has received regulatory approvals in various indications in a growing number of ex-U.S. territories and countries, including but not limited to the European Union, the United Kingdom, Mainland China, Taiwan, Hong Kong, Australia, South Korea, Singapore, Israel, and Canada. XPOVIO/NEXPOVIO is marketed in these respective ex-U.S. territories by Karyopharm’s partners: Antengene, Menarini, Neopharm, and FORUS. Selinexor is also being investigated in several other mid- and late-stage clinical trials across multiple high unmet need cancer indications, including in myelofibrosis and endometrial cancer.

For more information about Karyopharm’s products or clinical trials, please contact the Medical Information department at: Tel: +1 (888) 209-9326; Email: [email protected]

XPOVIO (selinexor) is a prescription medicine approved:

In combination with bortezomib and dexamethasone for the treatment of adult patients with multiple myeloma who have received at least one prior therapy (XVd).

In combination with dexamethasone for the treatment of adult patients with relapsed or refractory multiple myeloma who have received at least four prior therapies and whose disease is refractory to at least two proteasome inhibitors, at least two immunomodulatory agents, and an anti‐CD38 monoclonal antibody (Xd).

For the treatment of adult patients with relapsed or refractory diffuse large B‐cell lymphoma (DLBCL), not otherwise specified, including DLBCL arising from follicular lymphoma, after at least two lines of systemic therapy. This indication is approved under accelerated approval based on response rate. Continued approval for this indication may be contingent upon verification and description of clinical benefit in confirmatory trial(s).
SELECT IMPORTANT SAFETY INFORMATION

Warnings and Precautions

Thrombocytopenia: Monitor platelet counts throughout treatment. Manage with dose interruption and/or reduction and supportive care.

Neutropenia: Monitor neutrophil counts throughout treatment. Manage with dose interruption and/or reduction and granulocyte colony‐stimulating factors.

Gastrointestinal Toxicity: Nausea, vomiting, diarrhea, anorexia, and weight loss may occur. Provide antiemetic prophylaxis. Manage with dose interruption and/or reduction, antiemetics, and supportive care.

Hyponatremia: Monitor serum sodium levels throughout treatment. Correct for concurrent hyperglycemia and high serum paraprotein levels. Manage with dose interruption, reduction, or discontinuation, and supportive care.

Serious Infection: Monitor for infection and treat promptly.

Neurological Toxicity: Advise patients to refrain from driving and engaging in hazardous occupations or activities until neurological toxicity resolves. Optimize hydration status and concomitant medications to avoid dizziness or mental status changes.

Embryo‐Fetal Toxicity: Can cause fetal harm. Advise females of reproductive potential and males with a female partner of reproductive potential, of the potential risk to a fetus and use of effective contraception.

Cataract: Cataracts may develop or progress. Treatment of cataracts usually requires surgical removal of the cataract.
Adverse Reactions

The most common adverse reactions (≥20%) in patients with multiple myeloma who receive XVd are fatigue, nausea, decreased appetite, diarrhea, peripheral neuropathy, upper respiratory tract infection, decreased weight, cataract and vomiting. Grade 3‐4 laboratory abnormalities (≥10%) are thrombocytopenia, lymphopenia, hypophosphatemia, anemia, hyponatremia and neutropenia. In the BOSTON trial, fatal adverse reactions occurred in 6% of patients within 30 days of last treatment. Serious adverse reactions occurred in 52% of patients. Treatment discontinuation rate due to adverse reactions was 19%.

The most common adverse reactions (≥20%) in patients with multiple myeloma who receive Xd are thrombocytopenia, fatigue, nausea, anemia, decreased appetite, decreased weight, diarrhea, vomiting, hyponatremia, neutropenia, leukopenia, constipation, dyspnea and upper respiratory tract infection. In the STORM trial, fatal adverse reactions occurred in 9% of patients. Serious adverse reactions occurred in 58% of patients. Treatment discontinuation rate due to adverse reactions was 27%.

The most common adverse reactions (incidence ≥20%) in patients with DLBCL, excluding laboratory abnormalities, are fatigue, nausea, diarrhea, appetite decrease, weight decrease, constipation, vomiting, and pyrexia. Grade 3‐4 laboratory abnormalities (≥15%) are thrombocytopenia, lymphopenia, neutropenia, anemia, and hyponatremia. In the SADAL trial, fatal adverse reactions occurred in 3.7% of patients within 30 days, and 5% of patients within 60 days of last treatment; the most frequent fatal adverse reactions was infection (4.5% of patients). Serious adverse reactions occurred in 46% of patients; the most frequent serious adverse reaction was infection (21% of patients). Discontinuation due to adverse reactions occurred in 17% of patients.
Use In Specific Populations

Lactation: Advise not to breastfeed.

For additional product information, including full prescribing information, please visit www.XPOVIO.com.

To report SUSPECTED ADVERSE REACTIONS, contact Karyopharm Therapeutics Inc. at 1‐888‐209‐9326 or FDA at 1‐800‐FDA‐1088 or www.fda.gov/medwatch.

(Press release, Karyopharm, APR 21, 2026, View Source [SID1234664614])

On April 21, 2026 ImmunityBio, Inc. (NASDAQ: IBRX), a commercial-stage immunotherapy company, reported that ANKTIVA (nogapendekin alfa inbakicept) is now commercially available in Saudi Arabia. Initial patients have been identified for treatment across both approved bladder and lung cancer indications in the Kingdom:

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In combination with Bacillus Calmette-Guérin (BCG) for the treatment of adult patients with BCG-unresponsive non-muscle invasive bladder cancer (NMIBC) carcinoma in situ (CIS), with or without papillary disease; and
In combination with an immune checkpoint inhibitor for the treatment of adult patients with metastatic non-small cell lung cancer (NSCLC), as authorized by the Saudi Food and Drug Authority (SFDA)
ANKTIVA is being distributed through ImmunityBio’s partnerships with Biopharma and Cigalah Healthcare, leading healthcare distribution companies in the Middle East, with support from the company’s wholly owned subsidiary in Saudi Arabia.

"Thanks to our strategic partnership with Biopharma and Cigalah Healthcare, and despite a fluid situation in the region, we have been able to bring this innovative cancer treatment to patients ahead of the deadline we announced in February," said Richard Adcock, President and CEO of ImmunityBio. "We continue to work with the same level of diligence and commitment to expand access to ANKTIVA for eligible patients across the Middle East and North Africa."

The Middle East and North Africa (MENA) region faces one of the most rapidly growing burdens of cancer globally, including bladder and lung cancers, underscoring the need for additional treatment options. Lung cancer today is among the most common cancers in Saudi Arabia, while the incidence of bladder cancer is elevated in several countries across the region. 1 2

"We are pleased to support the introduction of this immunotherapy to physicians and their patients in Saudi Arabia," said Tamer Eissa, General Manager, Biopharma. "We look forward to expanding access across the region."

"This milestone represents an important step in expanding access to ANKTIVA for patients in Saudi Arabia," said Patrick Soon-Shiong, M.D., Founder, Executive Chairman and Global Chief Scientific and Medical Officer at ImmunityBio. "We are encouraged by the growing body of clinical data and experience supporting its use across multiple indications and remain committed to working with physicians to bring this immunotherapy to appropriate patients in need around the globe."

ANKTIVA received U.S. Food and Drug Administration approval in April 2024 in combination with BCG for the treatment of BCG-unresponsive NMIBC CIS, with or without papillary tumors. It has subsequently received regulatory authorizations in multiple regions, including the United Kingdom (MHRA, July 2025), the European Union (European Commission, February 2026), Macau Special Administration Region of China (ISAF, March 2026), and Saudi Arabia (SFDA, January 2026); in addition, the SFDA approved ANKTIVA in combination with a checkpoint inhibitor for the treatment of metastatic non-small cell lung cancer.

Saudi Arabia Indication and Usage

BCG-unresponsive non-muscle invasive bladder cancer (NMIBC) carcinoma in situ:

ANKTIVA in combination with Bacillus Calmette-Guérin (BCG) is indicated for the treatment of adult patients with high-risk BCG-unresponsive non-muscle invasive bladder cancer (NMIBC) of carcinoma in situ (CIS) with or without papillary disease.

Non-small cell lung cancer (NSCLC):

ANKTIVA is indicated in combination with immune checkpoint inhibitors for the treatment of adult patients with metastatic NSCLC with disease progression on or after standard of care (immune checkpoint inhibitors alone or in combination with chemotherapy).

This indication is approved under accelerated approval based on the increase of ALC associated with overall survival in single arm study. Continued approval for this indication may be contingent upon verification and description of clinical benefit in confirmatory clinical trials.

U.S. IMPORTANT SAFETY INFORMATION

INDICATION AND USAGE: ANKTIVA is an interleukin-15 (IL-15) receptor agonist indicated with Bacillus Calmette-Guérin (BCG) for the treatment of adult patients with BCG-unresponsive non-muscle invasive bladder cancer (NMIBC) with carcinoma in situ (CIS) with or without papillary tumors.

WARNINGS AND PRECAUTIONS: Risk of Metastatic Bladder Cancer with Delayed Cystectomy. Delaying cystectomy can lead to the development of muscle-invasive or metastatic bladder cancer, which can be lethal. If patients with CIS do not have a complete response to treatment after a second induction course of ANKTIVA with BCG, reconsider cystectomy.

DOSAGE AND ADMINISTRATION: For Intravesical Use Only. Do not administer by subcutaneous or intravenous routes.

Please see the complete Indication and Important Safety Information and Prescribing Information for ANKTIVA at Anktiva.com.

(Press release, ImmunityBio, APR 21, 2026, View Source [SID1234664613])

On April 21, 2026 Immuneering Corporation (Nasdaq: IMRX), a late-stage clinical oncology company focused on keeping cancer patients alive and helping them thrive, reported that updated data from the Phase 2a clinical trial evaluating atebimetinib (IMM-1-104) in combination with modified gemcitabine/nab-paclitaxel (mGnP) in first-line pancreatic cancer patients will be presented as an oral presentation at the 2026 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting, taking place May 29 – June 2, 2026, in Chicago, IL.

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The oral presentation will highlight data from an expanded cohort totaling 55 first-line patients, which includes the initial cohort of 34 patients that the company previously reported plus an additional 21 patients.

"We are excited to present new survival data from an expanded cohort of 55 first-line pancreatic cancer patients treated with atebimetinib in combination with mGnP in an oral presentation at ASCO (Free ASCO Whitepaper)," said Ben Zeskind, Ph.D., CEO of Immuneering. "Atebimetinib was designed with three distinct mechanisms to promote survival: shrinking tumors durably, preserving body mass, and maximizing tolerability. We believe these mechanisms have the potential to both yield the best survival in the first-line setting, and to give patients the best chance of reaching and benefitting from second-line treatment. We look forward to sharing this updated dataset in first-line pancreatic cancer patients as we pursue our mission to help patients survive and thrive."

Oral Presentation Details:
Title: Results from a phase 2a study of atebimetinib in combination with mGnP in advanced or metastatic pancreatic cancer
Session Type/Title: Rapid Oral Abstract Session – Gastrointestinal Cancer – Gastroesophageal, Pancreatic, and Hepatobiliary
Abstract Number: 4013
Date and Time: June 1, 2026, 1:15 p.m. – 2:45 p.m. CDT
Presenter: Peter Vu, MD, MHA

(Press release, Immuneering, APR 21, 2026, View Source [SID1234664612])