GlobeNewswire Inc | Oct 21, 2021 04:05PM EDT

October 21, 2021

AUSTIN, Texas, Oct. 21, 2021 (GLOBE NEWSWIRE) -- Plus Therapeutics, Inc. (Nasdaq:PSTV) (the Company), a clinical-stage pharmaceutical company developing innovative, targeted radiotherapeutics for rare and difficult-to-treat cancers, today announced financial results for the third quarter ended September 30, 2021, and provided an overview of recent business highlights.

In the third quarter, we made meaningful progress executing our strategy to develop novel radiotherapeutics for rare and central nervous system cancers, said Marc H. Hedrick M.D., President and Chief Executive Officer of Plus Therapeutics. We increased the ReSPECT-GBM trial dose by 40%, were accepted to present an update of the ReSPECT-GBM trial data at the 2021 Society for Neuro-Oncology Annual Meeting in November, received clearance from the U.S. Food and Drug Administration for our Investigational New Drug application for leptomeningeal metastases, entered into an additional agreement for the production of our radiopharmaceutical products, and strengthened our leadership team with the appointment of a highly experienced Chief Medical Officer with decades of radiopharmaceutical development experience.

RECENT HIGHLIGHTS

Rhenium-186 NanoLiposome (186RNL), a novel radiotherapy in development for several rare cancer targets

Recurrent Glioblastoma (GBM)

-- The ongoing U.S. multi-center ReSPECT-GBM Phase 1 dose-finding clinical trial is designed to safely and effectively deliver high doses of radiation directly to brain tumors. Thus far, 22 patients with recurrent GBM have been treated in the ReSPECT-GBM trial across eight cohorts. A 40% increase in absorbed radiation doses per tumor in Cohort 8 over Cohort 7 have been achieved without dose-limiting toxicities. Patient recruitment continues at UT Health San Antonio, UT Southwestern in Dallas, and MD Anderson in Houston. Learn more at ClinicalTrials.gov. -- The Company will present interim data from its ReSPECT-GBM clinical trial at the 2021 American Society for Radiation Oncology (ASTRO) Annual Meeting scheduled October 24-27, 2021 and at the 2021 Society for Neuro-Oncology (SNO) Annual Meeting and Education Day scheduled November 18-21, 2021. -- The Company will host a roundtable discussion of the ReSPECT-GBM clinical trial on November 18, 2021 at 4:00 p.m. EST, which will be webcast, with Toral Patel, M.D., Associate Professor, Department of Neurosurgery, UT Southwestern Medical Center, and Andrew J. Brenner, M.D., Ph.D., Professor of Medicine, Neurology, and Neurosurgery at The University of Texas.

Leptomeningeal Metastases (LM)

-- The Company received clearance of its Investigational New Drug (IND) application from the U.S. Food and Drug Administration (FDA) for 186RNL for the treatment of LM. -- The Company expects to initiate patient accrual in a Phase 1 dose escalation trial of 186RNL (ReSPECT-LM) in the fourth quarter of 2021. -- ReSPECT-LM will be a multi-center, sequential cohort, open-label, single dose, dose escalation Phase 1 study of the safety, tolerability, biodistribution, dosimetry, and anti-tumor activity of 186RNL given intraventricularly via an Ommaya reservoir to subjects over 18 years old with LM. The primary endpoints of the study are the incidence and severity of adverse events and serious adverse events and the incidence of dose limiting toxicities. The secondary endpoints are the overall response rate, duration or response, progression free survival, and overall survival. Learn more at ClinicalTrials.gov.

Pediatric Brain Cancer (PBC)

-- The Company intends to submit an IND application to the FDA for 186RNL for the treatment of PBC. The Company expects to initiate patient accrual in a Phase 1 dose escalation trial of 186RNL (ReSPECT-PBC) in 2022.

Drug Manufacturing and Supply Chain

-- During the third quarter of 2021, the Company entered into an agreement with RadioMedix, Inc. for the commercial production of the Companys investigational radiopharmaceuticals. Thus far in 2021, the Company has entered into five collaboration agreements to support its process development and analytical chemistry activities, as well as to strengthen its supply chain in compliance with current good manufacturing practices (GMP) for the manufacture of 186RNL. The Company remains on track to deliver GMP 186RNL by mid-2022.

Corporate

-- During the third quarter of 2021, the Company announced the appointment of Norman LaFrance, M.D. to the position of Chief Medical Officer and Senior Vice President. Dr. LaFrance joins Plus Therapeutics with nearly 40 years of experience as a nuclear medicine physician and as an executive in the pharmaceutical and healthcare industries. Dr. LaFrance area of specialization is radiotherapeutic drug research and development as well as regulatory approval and commercialization of molecular imaging, diagnostic and therapeutic products.

UPCOMING EVENTS AND MILESTONES

Over the next 12 months, the Company intends to accomplish the following key business objectives:

-- Complete enrollment of the ongoing cohort in the ReSPECT-GBM Phase 1 clinical trial. -- Fully analyze the ReSPECT-GBM Phase 1 clinical trial data and refine its Phase 2/3 clinical trial plans with the FDA. -- Initiate patient accrual in the Phase 1 ReSPECT-LM clinical trial. -- Submit an IND application to the FDA for 186RNL for the treatment of patients with PBC. -- Complete CMC activities for GMP 186RNL and complete CMC related meeting with the FDA.

THIRD QUARTER 2021 FINANCIAL RESULTS

-- As of September 30, 2021, the Companys cash balance was $21.3 million, compared to $8.3 million as of December 31, 2020. -- Total operating expenses for the third quarter of 2021 were $3.5 million, compared to total operating expenses of $1.4 million for the same quarter in 2020. This increase is primarily due to increased research and development expenses in 2021. -- Net loss for the third quarter of 2021 was $3.7 million, or $(0.28) per share, compared to a net loss of $1.7 million, or $(0.39) per share, for the same quarter in 2020. The increase in net loss is primarily due to the aforementioned increase in research and development expenses.

Third Quarter 2021 Results Conference Call

The Company will hold a conference call and live audio webcast at 5:00 p.m. Eastern Time today to discuss its financial results and provide a general business update.

Event: Plus Therapeutics Third Quarter 2021 Results Conference CallDate: Thursday, October 21, 2021Time: 5:00 p.m. Eastern TimeLive 877-876-9173 (toll free); 785-424-1667 (Intl.); Conference ID:Call: PSTVQ321

The webcast can be accessed live via the investor section of the Plus Therapeutics website at ir.plustherapeutics.com/events and will be available for replay beginning two hours after the conclusion of the conference call.

About Plus Therapeutics, Inc.

Plus Therapeutics, Inc. isa clinical-stage pharmaceutical company focused on the development, manufacture, and commercialization of complex and innovative treatments for patients battling cancer and other life-threatening diseases.

Our proprietary nanotechnology platform is currently centered around the enhanced delivery of a variety of drugs using novel liposomal encapsulation technology. Liposomal encapsulation has been extensively explored and undergone significant technical and commercial advances since it was first developed.Our platform is designed to facilitate new delivery approaches and/or formulations of safe and effective, injectable drugs, potentially enhancing the safety, efficacy and convenience for patients and healthcare providers. More information may be found atPlusTherapeutics.comandReSPECT-Trials.com.

Cautionary Statement Regarding Forward-Looking Statements

This press release contains statements that may be deemed forward-looking statements within the meaning of U.S. securities laws. All statements in this press release other than statements of historical fact are forward-looking statements. These forward-looking statements may be identified by future verbs, as well as terms such as designed to, will, plan, can, design, intend, potential, expect, target, focus, and similar expressions or the negatives thereof. Such statements are based upon certain assumptions and assessments made by management in light of their experience and their perception of historical trends, current conditions, expected future developments and other factors they believe to be appropriate. These statements include, without limitation, statements regarding the following: the Companys anticipated expenditures, including research and development, sales and marketing, and general and administrative expenses; anticipated benefits of strategic collaborations and license agreements, intellectual property, FDA approval process and government regulation; the ability of 186RNL to safely and effectively deliver radiation directly to the tumor at high doses; the Companys ability to expand clinical testing of 186RNL to additional sites and additional indications, such as leptomeningeal metastases and pediatric brain cancer; the Companys clinical trials including statements regarding the timing and characteristics of the ReSPECT-LM or the ReSPECT-PBC trials; the potential size of the market for the Companys product candidates; the Companys research and development efforts; the Companys IP strategy; competition; future development and/or expansion of its product candidates and therapies in its markets; its ability to obtain and maintain regulatory approvals including statements regarding the Companys intent to submit any new IND application; expectations as to the Companys future performance; the Companys need for additional financing and the availability thereof; its ability to fully access its equity line with Lincoln Park; any changes to its interest expenses; the Companys ability to continue as a going concern; operating results; and the potential enhancement of the Companys cash position through development, marketing, and licensing arrangements.

The forward-looking statements included in this press release are subject to a number of risks and uncertainties that may cause actual results to differ materially from those discussed in such forward-looking statements. These risks and uncertainties include, but are not limited to: the Companys actual results may differ, including materially, from those anticipated in these forward-looking statements as a result of various factors, including, but not limited to, the following: the early stage of the Companys product candidates and therapies, the results of the Companys research and development activities, including uncertainties relating to the clinical trials of its product candidates and therapies; the Companys liquidity and capital resources and its ability to raise additional cash, the outcome of the Companys partnering/licensing efforts, risks associated with laws or regulatory requirements applicable to it, market conditions, product performance, litigation or potential litigation, and competition within the regenerative medicine field, among others; and additional risks described under the heading Risk Factors in the Companys Securities and Exchange Commission filings, including in the Companys annual and quarterly reports. There may be events in the future that the Company is unable to predict, or over which it has no control, and its business, financial condition, results of operations and prospects may change in the future. The Company assumes no responsibility to update or revise any forward-looking statements to reflect events, trends or circumstances after the date they are made unless the Company has an obligation under U.S. federal securities laws to do so.

PLUS THERAPEUTICS, INC. CONSOLIDATED CONDENSED BALANCE SHEETS(UNAUDITED)(in thousands, except share and par value data)

September30, December31, 2021 2020Assets Current assets: Cash and cash equivalents $ 21,280 $ 8,346 Other current assets 817 829 Total current assets 22,097 9,175 Property and equipment, net 1,646 1,820 Operating lease right-of-use assets 559 636 Goodwill 372 372 Intangible assets, net 60 86 Other assets 16 16 Total assets $ 24,750 $ 12,105 Liabilities and Stockholders? Equity Current liabilities: Accounts payable and accrued expenses $ 2,630 $ 2,081 Operating lease liability 106 123 Term loan obligations, net of discount 6,752 6,335 Total current liabilities 9,488 8,539 Noncurrent operating lease liability 504 528 Warrant liability 3 7 Total liabilities 9,995 9,074 Stockholders? equity: Preferred stock, $0.001 par value; 5,000,000shares authorized; 1,952 and 1,954 shares ? ? issued and outstanding at September 30, 2021and December 31, 2020, respectivelyCommon stock, $0.001 par value; 100,000,000shares authorized; 15,360,025 and 6,749,028 15 7 shares issued and outstanding at September30, 2021 and December 31, 2020, respectivelyAdditional paid-in capital 457,495 436,535 Accumulated deficit (442,755 ) (433,511 )Total stockholders? equity 14,755 3,031 Total liabilities and stockholders? equity $ 24,750 $ 12,105

PLUS THERAPEUTICS, INC. CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (UNAUDITED)(in thousands, except share and per share data)

For the Three Months Ended For the Nine Months Ended September30, September30, 2021 2020 2021 2020 Development revenues:Governmentcontracts and $ ? $ ? $ ? $ 303 otherOperating expenses:Research and 1,491 336 3,724 1,604 developmentIn processresearch anddevelopment ? ? ? 781 acquired fromNanoTxGeneral and 1,990 1,060 4,811 4,107 administrativeLoss ondisposal of 18 ? 18 ? property andequipmentTotaloperating 3,499 1,396 8,553 6,492 expensesLoss from (3,499 ) (1,396 ) (8,553 ) (6,189 )operations Other income (expense):Interest 5 2 13 47 incomeInterest (232 ) (253 ) (708 ) (854 )expenseChange in fairvalue of 2 (81 ) 4 2,342 warrantsTotal otherincome (225 ) (332 ) (691 ) 1,535 (expense)Net loss $ (3,724 ) $ (1,728 ) $ (9,244 ) $ (4,654 ) Net loss pershare, basic $ (0.28 ) $ (0.39 ) $ (0.84 ) $ (1.13 )and dilutedBasic anddilutedweightedaverage sharesused incalculating 13,264,230 4,402,221 10,961,284 4,113,928 net loss pershareattributableto commonstockholders

PLUS THERAPEUTICS, INC.CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS(UNAUDITED)(in thousands)

For the Nine Months Ended September30, 2021 2020 Cash flows used in operating activities: Net loss $ (9,244 ) $ (4,654 )Adjustments to reconcile net loss to net cash used in operating activities:Depreciation and amortization 266 273 Amortization of deferred financing costs and debt 417 428 discountLoss on disposal of property and equipment 18 ? In process research and development acquired from ? 781 NanoTx TherapeuticsNoncash lease expenses 36 2 Change in fair value of warrants (4 ) (2,342 )Stock-based compensation expense 425 149 Increases (decreases) in cash caused by changes in operating assets and liabilities:Accounts receivable ? 1,169 Other current assets 12 516 Other assets ? 54 Accounts payable and accrued expenses 418 (1,586 )Net cash used in operating activities (7,656 ) (5,210 )Cash flows used in investing activities: Purchases of property and equipment (134 ) (37 )Proceeds from sale of property and equipment 50 ? In process research and development acquired from ? (400 )NanoTx TherapeuticsNet cash used in investing activities (84 ) (437 )Cash flows provided by (used in) financing activities:Principal payments of long-term obligations - (5,307 )Payment of financing lease liability (8 ) (93 )Proceeds from exercise of warrants 2,017 1,081 Proceeds from sale of common stock, net 18,665 ? Net cash provided by (used in) financing 20,674 (4,319 )activitiesNet increase (decrease) in cash and cash 12,934 (9,966 )equivalentsCash and cash equivalents at beginning of period 8,346 17,592 Cash and cash equivalents at end of period 21,280 7,626

Investor ContactPeter VozzoICR Westwicke(443) 377-4767 Peter.Vozzo@westwicke.com

Media ContactTerri ClevengerICR Westwicke(203) 856-4326Terri.Clevenger@westwicke.com