PYX-106

— PYX-201 achieved a confirmed 50% ORR by RECIST 1.1 including one Complete Response and 100% Disease Control Rate in six heavily pretreated HNSCC patients, supporting differentiated mono and front-line combo therapy expansion trials to begin dosing 1Q25 — Overall, 26% ORR across all six Solid Tumor Types of Interest (n=31) with Dose Dependent Responses Observed, Supporting First-In-Concept Mechanism with Novel Extracellular Targeting ADC — New Clinical Trial Collaboration Agreement with Merck (known as MSD outside of the US and Canada) to evaluate the combination of novel extracellular PYX-201 ADC and Merck’s anti-PD-1 therapy, KEYTRUDA® (pembrolizumab) to begin dosing 1Q25 in patients with HNSCC, HR+/HER2- breast, TNBC, and sarcoma — PYX-201 generally well-tolerated with a favorable safety profile — Multiple data updates expected in 2025 — Company to host in-person and virtual investor event today at 4:30 p.m. ET Nov. 20, 2024 -- Pyxis Oncology, Inc. (Nasdaq: PYXS), a clinical stage company focused on developing next generation therapeutics to target difficult-to-treat cancers, today announced positive preliminary data from the ongoing Phase 1 clinical dose escalation study evaluating PYX-201 in multiple types of solid tumors. PYX-201, the Company’s lead clinical drug candidate, is a first-in-concept antibody-drug conjugate (ADC) with a microtubule inhibitor (optimized auristatin) payload that uniquely targets Extradomain-B Fibronectin (EDB+FN), a non-cellular structural component within the tumor extracellular matrix (ECM). "These positive data represent a significant milestone for Pyxis Oncology as our novel ECM-targeting ADC, PYX-201, has demonstrated clinical responses by RECIST 1.1 in six tumor types of interest: HNSCC, ovarian, NSCLC, HR+/HER2- breast, TNBC, and Sarcoma. The breadth and depth of our clinical responses clearly indicate the potential of PYX-201 to provide meaningful clinical benefits to patients with difficult-to-treat cancers," said Lara S. Sullivan, M.D., President and Chief Executive Officer of Pyxis Oncology. "In addition to the monotherapy expansion studies we are launching in 1Q25 in HNSCC, I am thrilled to announce our new Clinical Trial Collaboration Agreement with Merck (known as MSD outside of the US and Canada) to evaluate the combination of PYX-201 and Merck’s anti-PD-1 therapy, KEYTRUDA® (pembrolizumab) in patients with HNSCC, HR+/HER2- breast, TNBC and Sarcoma with first patients expected to dose in 1Q25." In this ongoing open-label, multicenter, dose-escalation Phase 1 trial of PYX-201, 80 patients have been enrolled and dosed across multiple solid tumor types to receive doses of PYX-201 ranging from 0.3 mg/kg up to 8.0 mg/kg. The trial's main objectives are to evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics, and preliminary efficacy of PYX-201. The current identified dose range for PYX-201 is 3.6 mg/kg to 5.4 mg/kg. The number of prior lines of cancer therapies for patients enrolled is a median of 4 lines and up to 10 lines in some patients. The data cutoff date for this data announcement was October 4, 2024. Significant clinical responses were observed in HNSCC. Among evaluable HNSCC patients treated at an identified dose range of PYX-201 from 3.6 – 5.4 mg/kg (n=6), a confirmed 50% objective response rate (ORR) was observed, including one confirmed complete response (CR) and two confirmed partial responses (PR) by RECIST 1.1. "These encouraging preliminary clinical data demonstrate the potential for PYX-201 to yield meaningful responses in heavily pretreated patients with head and neck cancer along with several additional solid tumor types," said Glenn J. Hanna, M.D., Director, Center for Cancer Therapeutic Innovation (Early Drug Development Program) and Center for Salivary and Rare Head and Neck Cancers at Dana-Farber Cancer Institute, and Associate Professor of Medicine, Harvard Medical School. "The patients in the study have endured multiple rounds of therapy before treatment with PYX-201. We believe the quantity and quality of the responses, including a complete response and PYX-201's tolerability profile, highlight its promising potential across multiple indications with high unmet medical need, particularly in head and neck cancer." Clinical Trial Collaboration Agreement with Merck’s KEYTRUDA® (pembrolizumab) The Company additionally announces that it has entered into a Clinical Trial Collaboration Agreement with Merck (known as MSD outside of the US and Canada), for a Pyxis Oncology-sponsored study of PYX-201 in combination with Merck’s anti-PD-1 therapy, KEYTRUDA® (pembrolizumab) in patients with 1L and 2L head and neck squamous cell carcinoma (HNSCC), HR+/HER2- breast cancer, and triple-negative breast cancer (TNBC) and sarcoma. KEYTRUDA® is a registered trademark of Merck Sharp & Dohme LLC, a subsidiary of Merck & Co., Inc., Rahway, NJ, USA. Pyxis Oncology and Merck each retain all commercial rights to their respective compounds, including as monotherapy or as combination therapies. PYX-201 Development Plans in Head and Neck Squamous Cell Carcinoma (HNSCC) PYX-201 and KEYTRUDA® combination dose escalation and expansion study in 1L and 2L HNSCC with preliminary clinical data readout expected in the second half of 2025; PYX-201 monotherapy study in 2L and 3L HNSCC patients who are platinum and PD-1 inhibitor experienced, with preliminary clinical data readout expected in the second half of 2025; and PYX-201 monotherapy study in 2L and 3L HNSCC patients who are EGFR and PD-1 inhibitor experienced, with preliminary clinical data readout expected in first half of 2026. Encouraging confirmed and unconfirmed responses were observed in five additional solid tumor types: ovarian cancer, non-small cell lung cancer (NSCLC), HR+/HER2- breast cancer, triple-negative breast cancer (TNBC), and sarcoma. PYX-201 Development Plan in Additional Tumor Types Exploratory PYX-201 Phase 1 monotherapy expansion cohorts are planned in ovarian cancer, NSCLC, HR+/HER2- breast cancer, TNBC, and sarcoma, with preliminary clinical data expected in the second half of 2025. PYX-201 and KEYTRUDA® combination study in HR+/HER2- breast cancer, TNBC, and sarcoma with preliminary clinical data expected in the second half of 2025 and the first half of 2026. Preclinical studies of PYX-201 in combination with other agents in ovarian cancer and NSCLC to commence in 2025 to be followed by clinical studies with preliminary clinical data expected in 2026. PYX-201 demonstrated favorable preliminary tolerability profile data with low incidence of dose discontinuation, interruptions or delays due to treatment-related adverse events (TRAE). Low incidence of Grade 3 or Grade 4 payload-related TRAEs within the identified dose range reinforce PYX-201’s differentiated construct enabling enhanced molecular stability and differential expression of Extradomain-B (EDB) in tumor tissue with negligible expression in normal tissues. The low incidence of Grade 1 or Grade 2 adverse events points to an attractive safety, given that it has been well tolerated and suitable for both monotherapy and combination therapy development. With respect to PK data, PYX-201 demonstrated increased stability in circulation, which we believe is due to its proprietary design of site-specific conjugation chemistry as compared to certain approved val-cit-monomethyl auristatin E (MMAE) ADCs with non-site-specific conjugation chemistry. "PYX-201 is an innovative investigational therapy designed with a unique extracellular mechanism of action, unlike any other ADC currently on the market or in development. These initial clinical data, demonstrating tumor shrinkage across a broad range of solid tumors with a differentiated safety profile indicate a significant opportunity to further develop PYX-201 across a variety of tumor types in both the mono and combo therapy settings," said Anthony Tolcher, M.D., FRCPC, FACP, Founder and Chief Executive Officer of NEXT Oncology and PYX-201 Study Investigator. "Additionally, the encouraging safety data support the potential for PYX-201 to be safely combined with other agents, including checkpoint inhibitors, to drive further patient responses." Additional details and analyses beyond what have been included in this press release will be presented during the Company's preliminary PYX-201 Phase 1 data investor event today. Pyxis Oncology will host a virtual and in-person investor event to discuss the preliminary Phase 1 data today, Wednesday, November 20, 2024, at 4:30 p.m. ET at Venue 42 by Convene, located at 5 Times Square in New York City. Anyone interested in attending the live event should RSVP to pyxis.oncology.data.event. Pyxis Oncology’s members of executive management team will be joined by the following physician thought leaders to discuss preliminary data from the Phase 1 trial: Anthony Tolcher, M.D., FRCPC, FACP, Founder and Chief Executive Officer, NEXT Oncology Glenn J. Hanna, M.D., Director, Center for Cancer Therapeutic Innovation (Early Drug Development Program) and Center for Salivary and Rare Head and Neck Cancers at Dana-Farber Cancer Institute, and Associate Professor of Medicine, Harvard Medical School Pyxis Oncology, Inc. is a clinical stage company focused on defeating difficult-to-treat cancers. The company is efficiently building next generation therapeutics that hold the potential for mono and combination therapies. PYX-201, an antibody-drug conjugate (ADC) that uniquely targets EDB+FN, a non-cellular structural component of the tumor extracellular matrix, and PYX-106, a fully human Siglec-15-targeting antibody designed to block suppression of T-cell proliferation and function, are being evaluated in ongoing Phase 1 clinical studies in multiple types of solid tumors. Pyxis Oncology’s therapeutic candidates are designed to directly kill tumor cells and to address the underlying pathologies created by cancer that enable its uncontrollable proliferation and immune evasion. Pyxis Oncology’s ADC and immuno-oncology (IO) programs employ novel and emerging strategies to target a broad range of solid tumors resistant to current standards of care. To learn more, visit www.pyxisoncology.com or follow us on X (formerly known as Twitter) and LinkedIn. The content above comes from the network. if any infringement, please contact us to modify.

- Preliminary data from the first-in-patient Phase 1 dose escalation trial of PYX-201 to be announced at upcoming virtual and in-person event in New York City on Wednesday, November 20, 2024, at 4:30 p.m. ET - Preliminary data from the Phase 1 trial of PYX-106 is expected to be reported by year-end 2024 - Expected cash runway into 2H 2026 BOSTON, Mass., Nov. 12, 2024 (GLOBE NEWSWIRE) -- Pyxis Oncology, Inc. (Nasdaq: PYXS), a clinical stage company focused on developing next generation therapeutics to target difficult-to-treat cancers, today reported financial results for the third quarter ended September 30, 2024, and provided a corporate update. The Company ended the third quarter of 2024 with $146.3 million in cash, cash equivalents, restricted cash, and short-term investments, which is expected to provide a cash runway into the second half of 2026 and enable the Company to fund the next phase of PYX-201 clinical development. “At Pyxis Oncology, our team has been working diligently to deliver preliminary data from our first-in-patient clinical trial of PYX-201. Investigator enthusiasm around our novel mechanism of action, along with our clinical development team’s operational execution, has kept us on track to provide the preliminary clinical findings from our ongoing dose escalation study,” said Lara S. Sullivan, M.D., President and CEO of Pyxis Oncology. Dr. Sullivan continued, “We have now enrolled 80 patients in the PYX-201 trial across multiple tumor types, and I am thrilled to present the Phase 1 dose escalation data next Wednesday in New York City at our first-ever Pyxis Oncology Investor Event.” Recent Clinical Program Updates PYX-201 PYX-201 is an antibody-drug conjugate (ADC) that is designed to uniquely target Extradomain-B Fibronectin (EDB+FN), which is believed to be a key structural component of the tumor extracellular matrix. PYX-201 is the Company’s lead clinical program being evaluated in an ongoing Phase 1 trial in multiple types of solid tumors. To date, 80 subjects have been dosed with PYX-201 in this Phase 1 trial. Dose escalation and safety monitoring remain ongoing for the trial.The Company will present preliminary data from the Phase 1 dose escalation trial of PYX-201, including efficacy, safety, and pharmacokinetics (PK). The Company will provide an update on future development plans at a Company hosted investor event in New York City on Wednesday, November 20, 2024, at 4:30 p.m. ET. Additional information about the event can be found here. PYX-106 PYX-106, a fully human Siglec-15-targeting antibody designed to block suppression of T-cell proliferation and function, is being evaluated in an ongoing Phase 1 clinical study in multiple types of solid tumors. Dose escalation of PYX-106 and safety monitoring is ongoing with 45 subjects dosed to date in the Phase 1 trial.The Company expects to report preliminary data from the Phase 1 trial of PYX-106, including PK/pharmacodynamic results, by year-end 2024. Third Quarter 2024 Financial Results As of September 30, 2024, Pyxis Oncology had cash and cash equivalents, including restricted cash and short-term investments of $146.3 million. The Company believes that its current cash, cash equivalents, and short-term investments will be sufficient to fund its operations into the second half of 2026.Research and development expenses were $17.7 million for the quarter ended September 30, 2024, compared to $14.7 million for the quarter ended September 30, 2023. The period-over-period increase was primarily due to increased clinical trial-related expenses, including manufacturing of drug product and drug substance for our ongoing Phase 1 clinical trials of PYX-201 and PYX-106.General and administrative expenses were $6.0 million for the quarter ended September 30, 2024, compared to $10.7 million for the quarter ended September 30, 2023. The period-over-period decline was primarily due to lower legal, professional and consulting fees.Net loss was $21.2 million, or ($0.35) per common share, for the quarter ended September 30, 2024, compared to $23.0 million, or ($0.56) per common share, for the quarter ended September 30, 2023. Net losses for the quarters ended September 30, 2024, and 2023 included $3.0 million and $5.2 million, respectively, related to non-cash stock-based compensation expense.As of November 12, 2024, the outstanding number of shares of common stock of Pyxis Oncology was 59,465,729. About Pyxis Oncology, Inc.Pyxis Oncology, Inc. is a clinical stage company focused on defeating difficult-to-treat cancers. The company is efficiently building next generation therapeutics that hold the potential for mono and combination therapies. PYX-201, an antibody-drug conjugate (ADC) that uniquely targets EDB+FN, a non-cellular structural component of the tumor extracellular matrix, and PYX-106, a fully human Siglec-15-targeting antibody designed to block suppression of T-cell proliferation and function, are being evaluated in ongoing Phase 1 clinical studies in multiple types of solid tumors. Pyxis Oncology’s therapeutic candidates are designed to directly kill tumor cells and to address the underlying pathologies created by cancer that enable its uncontrollable proliferation and immune evasion. Pyxis Oncology’s ADC and immuno-oncology (IO) programs employ novel and emerging strategies to target a broad range of solid tumors resistant to current standards of care. To learn more, visit www.pyxisoncology.com or follow us on Twitter and LinkedIn. Forward-Looking StatementsThis press release contains forward-looking statements for the purposes of the safe harbor provisions under The Private Securities Litigation Reform Act of 1995 and other federal securities laws. These statements are often identified by the use of words such as “anticipate,” “believe,” “can,” “continue,” “could,” “estimate,” “expect,” “intend,” “likely,” “may,” “might,” “objective,” “ongoing,” “plan,” “potential,” “predict,” “project,” “should,” “to be,” “will,” “would,” or the negative or plural of these words, or similar expressions or variations, although not all forward-looking statements contain these words. We cannot assure you that the events and circumstances reflected in the forward-looking statements will be achieved or occur and actual results could differ materially from those expressed or implied by these forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those identified herein, and those discussed in the section titled “Risk Factors” set forth in Part II, Item 1A. of the Company’s Quarterly Report on Form 10-Q filed with SEC on November 12, 2024, and our other filings, each of which is on file with the Securities and Exchange Commission. These risks are not exhaustive. New risk factors emerge from time to time, and it is not possible for our management to predict all risk factors, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements. In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date hereof and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain, and investors are cautioned not to unduly rely upon these statements. Except as required by law, we undertake no obligation to update any forward-looking statements to reflect events or circumstances after the date of such statements. Pyxis Oncology ContactPamela ConnealyCFO and COOir@pyxisoncology.com PYXIS ONCOLOGY, INC. Condensed Consolidated Statements of Operations and Comprehensive Loss(In thousands, except share and per share amounts)(Unaudited) Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Revenues Royalty revenues $— $— $8,146 $— Sale of royalty rights — — 8,000 — Total revenues — — 16,146 — Costs and operating expenses: Cost of revenues — — 475 — Research and development 17,741 14,687 44,723 37,979 General and administrative 6,013 10,667 20,339 26,450 Total costs and operating expenses 23,754 25,354 65,537 64,429 Loss from operations (23,754) (25,354) (49,391) (64,429)Other income, net: Interest and investment income 1,846 1,707 5,419 5,036 Sublease income 705 598 2,212 1,200 Total other income, net 2,551 2,305 7,631 6,236 Net loss $(21,203) $(23,049) $(41,760) $(58,193)Net loss per common share - basic and diluted $(0.35) $(0.56) $(0.73) $(1.52)Weighted average shares of common stock outstanding - basic and diluted 60,715,041 41,331,806 57,511,997 38,379,401 PYXIS ONCOLOGY, INC. Condensed Consolidated Balance Sheets(In thousands, except per share amounts)(Unaudited) September 30, 2024 December 31, 2023 Assets Current assets: Cash and cash equivalents $12,056 $9,664 Marketable debt securities, short-term 132,762 109,634 Restricted cash 1,472 1,472 Prepaid expenses and other current assets 2,578 3,834 Total current assets 148,868 124,604 Property and equipment, net 10,396 11,872 Intangible assets, net 23,619 24,308 Right-of-use asset 12,428 12,942 Total assets $195,311 $173,726 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable $4,870 $3,896 Accrued expenses and other current liabilities 14,057 12,971 Operating lease liabilities, current portion 1,393 1,232 Deferred revenues — 7,660 Total current liabilities 20,320 25,759 Operating lease liabilities, net of current portion 19,030 20,099 Financing lease liabilities, net of current portion 117 — Deferred tax liability, net 2,164 2,164 Total liabilities 41,631 48,022 Commitments and contingencies Stockholders’ equity: Preferred stock, par value $0.001 per share — — Common stock, par value $0.001 per share 59 45 Additional paid-in capital 481,255 411,821 Accumulated other comprehensive income 351 63 Accumulated deficit (327,985) (286,225)Total stockholders’ equity 153,680 125,704 Total liabilities and stockholders’ equity $195,311 $173,726