On April 15, 2026 Callio Therapeutics, a biotherapeutics company advancing dual-payload antibody-drug conjugates (ADCs) with a targeted, multi-mechanism approach to cancer treatment, reported a poster presentation on CLIO-8221 at the American Association of Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting 2026 (April 17-22, San Diego). CLIO-8221, currently being evaluated in an ongoing Phase 1 trial, is a first-in-class dual-payload ADC, engineered for targeted delivery of two payload classes, a topoisomerase 1 (Topo1) inhibitor and an ATR inhibitor, to HER2-expressing tumors.

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"CLIO-8221 is the first program from Callio’s dual-payload ADC pipeline to enter the clinic, just one year after our launch, underscoring our commitment to advancing innovative dual-payload ADCs for cancer. By combining two complementary anti-cancer payloads, CLIO-8221 may offer a new treatment option for patients whose cancers are resistant to existing single-payload Topo1 inhibitor-based ADCs," said Jerome Boyd-Kirkup, Ph.D., Chief Scientific Officer of Callio Therapeutics. "Our preclinical studies support the high potency and enhanced tolerability of CLIO-8221, enabled by our next generation linker platform and ADC technologies, and we look forward to presenting these data at AACR (Free AACR Whitepaper)."

At AACR (Free AACR Whitepaper) 2026, Callio Therapeutics will present data that highlight the potential of CLIO-8221 as a therapeutic option for HER2-expressing cancers:

CLIO-8221 is a dual-payload ADC carrying a Topo1 inhibitor and an ATR inhibitor (DAR 4:4 ratio), selected to maximize anti-tumor efficacy and overcome Topo1 inhibitor resistance
CLIO-8221 uses proprietary linker and ADC technologies to reduce systemic toxicity and enable co-delivery of both payloads to drive strong tumor cell killing
CLIO-8221 demonstrated potent anti-tumor activity across varying HER2 expression levels and drove tumor regression after a single dose in both trastuzumab deruxtecan-sensitive and -insensitive models
CLIO-8221 has a broad therapeutic window with no toxicological findings observed at doses up to 70 mg/kg in NHP studies
Poster Presentation:

Title: Development of CLIO-8221: A HER2-targeted dual-payload ADC to address ADC resistance
Session Title: Session PO.ET02.03 – Antibody-Drug Conjugates and Linker Engineering 3
Date & Time: April 21, 2026, 9:00 AM – 12:00 PM PDT
Location: Poster Section 12
Poster Board Number: 5
Poster Number: 4427

A Phase 1 clinical trial (NCT07300943) for CLIO-8221 is ongoing in Australia and the United States, with Callio Therapeutics having received IND clearance from the U.S. Food and Drug Administration in March 2026. The IND is also under review by the China National Medical Products Administration, and the trial is expected to expand to multiple sites in China.

About CLIO-8221

HER2 is a clinically validated target for antibody-drug conjugates (ADCs), with multiple approved therapies demonstrating meaningful benefit across tumor types, however, most patients eventually progress on treatment despite retaining HER2 expression. Mechanistic resistance to cytotoxic payloads has emerged as a key reason for treatment failure. CLIO-8221 is a novel, first-in-class dual-payload ADC targeting HER2, designed to address this challenge.

CLIO-8221 delivers two mechanistically complementary payloads, a topoisomerase 1 (Topo1) inhibitor and an ATR inhibitor, directly to HER2-expressing tumors. While Topo1 inhibitors have shown strong clinical activity, activation of the DNA damage response following Topo1 inhibitor-induced replication stress represents a potential major driver of resistance. By simultaneously inhibiting Topo1 and blocking the DNA damage response through ATR inhibition, CLIO-8221 is engineered to overcome payload insensitivity and sensitize tumors to Topo1 inhibition. Developed using proprietary linker and ADC platform technologies, CLIO-8221 aims to maximize anti-tumor activity while reducing systemic toxicity, offering the potential for deeper and more durable responses in patients who have progressed on existing HER2-targeted therapies.

(Press release, Callio Therapeutics, APR 15, 2026, View Source [SID1234664427])

On April 15, 2026 Tango Therapeutics, Inc. (NASDAQ: TNGX), a clinical-stage biotechnology company committed to discovering and delivering the next generation of precision cancer medicines, reported key leadership appointments, adding three seasoned industry executives to the Company to support the rapid advancement of vopimetostat, a highly potent and selective PRMT5 inhibitor, towards its first potential regulatory approval in pancreatic cancer. Matthew Gall has been appointed Chief Financial Officer, Yen-Ching Chua as Chief Development Operations Officer, and Janice Kapty, PhD as SVP, Corporate Strategy and Project Leadership.

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"Building on our longstanding scientific leadership and recent clinical progress, Tango has a unique opportunity with vopimetostat to bring a potentially paradigm-shifting treatment to patients with pancreatic and other cancers," said Malte Peters, MD, President and Chief Executive Officer. "In order to support our goal and drive Tango’s next phase of growth, we have strengthened our development, corporate strategy and finance leadership to accelerate and support our efforts in late-stage development and potential commercialization. I extend my gratitude to our prior Chief Financial Officer, Daniella Beckman, for her many contributions to Tango since its inception, including taking the Company public and leading multiple capital raises. We wish her well in future endeavors. We look forward to presenting key clinical data this year, including initial data from our combination trial with Revolution Medicines, Inc.’s RAS(ON) inhibitors."

Matthew Gall has been appointed Chief Financial Officer effective April 15, succeeding Daniella Beckman. Mr. Gall is a seasoned biotechnology executive with extensive finance, corporate development, strategic transaction and capital raising experience. Previously, he was Chief Financial Officer at Kalaris Therapeutics and iTeos Therapeutics, and held finance, business development and corporate strategy roles at Sarepta Therapeutics, Celgene Corporation and Gilead Sciences.

Yen-Ching Chua has been appointed Chief Development Operations Officer effective June 1, overseeing clinical operations including data management, as well as quality, clinical compliance and clinical sourcing. She brings deep global experience, having previously led clinical and development operations across complex global portfolios at Novocure, Debiopharm International, MorphoSys and Novartis.

In addition, Janice Kapty, PhD has been appointed SVP, Corporate Strategy and Project Leadership, effective April 15. In this role, she will be responsible for portfolio strategy, oversee the project management organization, and ensure strong project leadership for vopimetostat and portfolio therapies, including TNG456. Previously, Dr. Kapty led drug development teams at Arvinas, MorphoSys, Constellation Pharmaceuticals, Bristol Myers Squibb and Celgene Corporation.

(Press release, Tango Therapeutics, APR 15, 2026, View Source [SID1234664426])

On April 15, 2026 Boehringer Ingelheim and Zai Lab (NASDAQ: ZLAB; HKEX: 9688) reported a clinical collaboration focused on pioneering a dual DLL3-targeting combination. The Phase Ib/II study will assess the safety, tolerability, and initial clinical activity of combining obrixtamig, Boehringer Ingelheim’s DLL3/CD3 T-cell engager, with zocilurtatug pelitecan (zoci; formerly ZL‑1310), Zai Lab’s DLL3-targeting ADC. The study will enroll patients with poorly differentiated NECs and extensive stage SCLC (ES-SCLC); diseases where patients urgently need more effective treatment options.

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"The strategy to engage the immune system with a specific T‑cell engager and deliver a potent cytotoxic payload with a DLL3‑targeting ADC, aligns with our immuno‑oncology strategy and our drive to advance smart combinations for hard‑to‑treat cancers," said Itziar Canamasas, Ph.D., Global Head of Oncology at Boehringer Ingelheim. "It’s another step in our mission to expand effective options for people with DLL3‑expressing cancers."

"Zoci has shown encouraging activity and good tolerability in SCLC," said Rafael G. Amado, M.D., President, Head of Global Research and Development at Zai Lab. "We have rapidly advanced zoci into pivotal stage and are pursuing opportunities to explore multiple combination approaches in SCLC and other NECs. This collaboration with Boehringer Ingelheim offers a compelling DLL3‑targeting strategy with the potential to benefit patients who urgently need better treatments."

Obrixtamig is Boehringer Ingelheim’s investigational bispecific DLL3/CD3 T‑cell engager, designed to direct the body’s own immune cells to attack DLL3‑expressing cancer cells, a hallmark of SCLC and certain NECs. In the global Phase I first‑line ES‑SCLC study DAREON‑8, in combination with chemotherapy and atezolizumab, obrixtamig showed encouraging signs of early clinical efficacy and a manageable safety profile1. Obrixtamig is being evaluated across multiple global studies and is advancing into a global Phase III trial (DAREON‑Lung‑1, NCT07472517). The molecule has received FDA Fast Track Designation and Orphan Drug Designation from both the FDA and the European Commission for neuroendocrine carcinomas.

Zocilurtatug pelitecan is Zai Lab’s DLL3targeting ADC engineered to deliver a potent cytotoxic payload to DLL3positive tumor cells in ES-SCLC. Updated global Phase I results in previously treated ES-SCLC show strong and durable responses, including in patients with brain metastases, along with a favorable safety profile. On this basis, the program has advanced into a global Phase III registrational study. In addition to SCLC, zoci is being evaluated in NECs. Zoci has received FDA Orphan Drug Designation and FDA Fast Track Designation for the treatment of SCLC.

Under the terms of the agreement, Zai Lab will supply its DLL3‑targeting ADC for the study, while Boehringer Ingelheim will sponsor and oversee day‑to‑day clinical operations. Each company retains the rights to its respective assets.

(Press release, Boehringer Ingelheim, APR 15, 2026, View Source [SID1234664425])

On April 15, 2026 Calidi Biotherapeutics, Inc. (NYSE American: CLDI) ("Calidi" or the "Company"), a biotechnology company pioneering the development of targeted genetic medicines, reported it will participate in RedChip’s upcoming virtual investor conference, "Biotech Resurgence: Platforms and Pipelines of Today’s Innovators," taking place April 16, 2026, from 9:30 a.m. to 4:00 p.m. E.T.

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The full-day event will spotlight publicly traded companies advancing innovation across biotechnology, therapeutics, medical devices, diagnostics, and digital health. The conference will provide investors with direct access to executive leadership teams developing next-generation healthcare platforms, advancing clinical pipelines, and scaling commercial healthcare solutions.

Registration is free and open to the public: View Source

RedTail is Calidi’s systemically delivered virotherapy platform designed to selectively target tumors, remodel the tumor microenvironment (TME), and enable high-level expression of therapeutic genetic payloads directly at the tumor site while limiting peripheral exposure. CLD-401, the lead candidate derived from the RedTail platform, is engineered to express high levels of IL-15 superagonist (IL-15 SA), a known T and NK-cell activator, in the TME. The Company expects to file an IND for CLD-401 by the end of 2026. Additionally, Calidi is expanding the RedTail platform to enable in situ expression of T-cell engagers (TCEs) in solid tumors, including in combination with T-cell activating payloads such as IL15 SA. This strategy is intended to support localized T-cell engagement within the TME following systemic administration. The Company is developing CLD-501, a RedTail virus that expresses high levels of a TROP2-targeting TCE and IL-15SA in the TME.

"I look forward to discussing the advances we’ve made with the RedTail platform and the path to IND filing expected this year for CLD-401" said Eric Poma, PhD, Chief Executive Officer of Calidi. "We continue to expand what the RedTail platform can do with new payload, a novel approach to in situ T-cell engagers, and ongoing lead discovery in indications outside of oncology."

The Company continues to expand the functionality of the RedTail platform and is also actively pursuing strategic partnerships to accelerate clinical development and broaden the impact of its RedTail platform.

(Press release, Calidi Biotherapeutics, APR 15, 2026, View Source [SID1234664424])

On April 15, 2026 Arima Genomics, Inc., a company leveraging whole-genome sequence and structure information to advance cancer therapy selection, reported that it will present new data at the American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting 2026, taking place April 17-22, 2026, in San Diego, California. The five presentations will highlight the power of Arima’s Hi-C sequencing-based approach to detect clinically relevant structural variants and uncover important drivers of cancer across solid tumors. Together, they reflect Arima’s vision for expanding cancer genomics beyond sequence alone.

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"Structural variants are an important driver of cancer biology, and Arima is focused on bringing that dimension into cancer genomics," said Anthony Schmitt, PhD, Senior Vice President of Science at Arima Genomics. "The data we will present at AACR (Free AACR Whitepaper) reflect the breadth of that opportunity across solid tumors."

The presentations include data demonstrating Arima’s ability to detect structural variants in lung and gastrointestinal tumors, showing concordance with traditional methods while also identifying variants those methods may miss. That capability, demonstrated across multiple studies, underpins Arima’s Aventa FusionPlus clinical assay. Additional presentations demonstrate the ability to detect and predict the functional impact of enhancer hijacking rearrangements and extrachromosomal DNA (ecDNA) amplifications in non-small cell lung cancer (NSCLC). A fifth presentation extends Arima’s work in fusion and rearrangement detection into gynecologic carcinosarcoma through analysis of aberrations involving genes potentially linked to homologous recombination deficiency (HRD). Together, the AACR (Free AACR Whitepaper) data show the range of biological and clinical questions that a structural variant-focused approach can address.

"These studies show how Arima’s technology provides a new lens with which to view the cancer genome in a way that no other technology can," said Tom Willis, PhD, Chief Executive Officer of Arima Genomics. "We are already putting this approach to work for patients through our Aventa clinical tests, while continuing to build the evidence and applications that support a more complete view of cancer."

List of Poster Presentations

April 20, 2026, 2:00-5:00 PM

Detection and functional assessment of extrachromosomal DNA amplifications in FFPE lung tumor specimens using Hi-C sequencing

Poster Number: 3259
Location: Section 22
Discovery and functional characterization of enhancer hijacking oncogene rearrangements in NSCLC using Hi-C sequencing of FFPE tumors

Poster Number: 3747
Location: Section 41
Fusions and rearrangement detection in gastrointestinal and lung tumors leveraging low-pass whole-genome sequencing based Hi-C chemistry

Poster Number: 3817
Location: Section 44
Genome wide testing of archived ovarian and uterine carcinosarcoma FFPE tissue using FusionPlus Hi-C to determine HRD status

Poster Number: 3970
Location: Section 49
April 21, 2026, 2:00-5:00 PM

Actionable fusions and rearrangements can be efficiently identified by Hi-C whole genome sequencing in lung tumors

Poster Number: 6521
Location: Section 43

(Press release, Arima Genomics, APR 15, 2026, View Source [SID1234664423])