Sutro Biopharma Reports Third Quarter 2020 Financial Results and Provides Business Highlights and Developments

SOUTH SAN FRANCISCO, Calif., Nov. 5, 2020 /PRNewswire/ -- Sutro Biopharma, Inc. (NASDAQ: STRO), a clinical-stage drug discovery, development and manufacturing company focused on the application of precise protein engineering and rational design to create next-generation cancer and autoimmune therapeutics, today reported its financial results for the quarter ended September 30, 2020 and its recent business highlights and developments.

"The third quarter of 2020 has been an exciting period for Sutro as we are progressing well on the clinical development of our proprietary antibody-drug conjugate (ADC) candidates. In September at the International Gynecologic Cancer Society Annual Meeting (IGCS), we provided interim data from our STRO-002 dose-escalation Phase 1 trial in ovarian patients with improved efficacy outcomes as our data mature with longer follow-up," said Bill Newell, Chief Executive Officer of Sutro Biopharma. "We look forward to providing a further update in December and also to initiate the dose-expansion portion of the trial in a population who are less heavily pretreated. In addition, we will be sharing our updated interim findings from the non-Hodgkin's lymphoma (NHL) cohort of the STRO-001 dose-escalation Phase 1, which has been accepted at the 62nd Annual Meeting of the American Society of Hematology (ASH). Finally, the Sutro team has been diligently working to advance cancer therapeutics and we were honored to receive The World ADC Best New Drug Developer Award for our work in developing clinical programs including STRO-001, STRO-002, and, in partnership with Bristol Meyers Squibb (BMS), CC-99712."

Recent Business Highlights and Developments

STRO-002: Continued progress on our program in STRO-002, folate receptor-alpha (FolR ) targeting ADC for development in ovarian cancer

    --  The dose-escalation portion of the STRO-002 Phase 1 clinical trial
        completed enrollment as of August 31, 2020. Interim data on
        dose-escalation trial in patients with recurrent platinum resistant or
        refractory ovarian cancer was presented at the IGCS in September.
    --  Additional Phase 1 data will be presented by key opinion leader (KOL)
        and management at the KOL Discussion of STRO-002 Data Event on December
        3, 2020.
    --  The dose-expansion portion of the Phase 1 trial is expected to enroll
        patients in the fourth quarter of 2020.

STRO-001: Dose escalation continues in STRO-001, a CD74 targeting ADC for development in B-cell malignancies

    --  STRO-001 is currently in Phase 1 dose-escalation trial enrolling
        patients with lymphoma and multiple myeloma. Dose-escalation in the
        Phase 1 trial is ongoing and the maximum tolerated dose has not yet been
        reached.
    --  Based on the reported data to date in heavily pre-treated patients,
        STRO-001 has been generally well-tolerated with no ocular toxicity
        signals observed.
    --  A dose-expansion portion of the Phase 1 is expected to begin enrolling
        patients in first half of 2021.

ASH Annual Meeting: Additional Phase 1 dose-escalation data for STRO-001 will be presented at ASH by Nirav N. Shah, M.D., Assistant Professor of Medicine at the Medical College of Wisconsin. Presentation will include results from patients with advanced, relapsed/refractory NHL and details are as follows:

    --  Title: Preliminary Results of an Ongoing Phase 1 Dose Escalation Study
        of the Novel Anti-CD74 Antibody Drug Conjugate (ADC), STRO-001, in
        Patients with B-cell Non-Hodgkin Lymphoma
    --  Session Name: 626. Aggressive Lymphoma (Diffuse Large B-Cell and Other
        Aggressive B-Cell Non-Hodgkin Lymphomas) - Results from Prospective
        Clinical Trials: Poster III
    --  Session Date: Monday, December 7, 2020
    --  Session Time: 7:00am-3:30pm PT / 10:00am-6:30pm ET
    --  Abstract: The abstract can be found in the ASH meeting program under
        #3030

Merck collaboration: Cytokine derivative programs are advancing in research development for cancer and autoimmune diseases

    --  Sutro is working with Merck on two research programs to discover new
        therapeutics for cancer and autoimmune diseases and Merck retains the
        right to nominate a third program.
    --  The collaboration is advancing two cytokine-derivative programs through
        lead optimization and in March 2020, Merck extended by one year the
        research term of the collaboration's first program, which included a
        $5.0 million payment to Sutro.

BMS collaboration: Phase 1 trial for CC-99712, an ADC targeting BCMA, is continuing to enroll with 3.0 mg/kg in the last reported dose level

    --  Since initiation in the second half of 2019, BMS has been enrolling
        patients in a Phase 1 dose escalation/expansion trial to assess
        treatment of relapsed and refractory multiple myeloma. The last reported
        dose level was 3.0 mg/kg with dose escalation expected to continue.
    --  BMS is responsible for the worldwide clinical development and
        commercialization of CC-99712. Sutro is entitled to development and
        regulatory milestone payments and tiered royalties on sales ranging from
        mid to high single digit percentages.

EMD Serono collaboration: IND for M1231, MUC1-EGFR bispecific ADC, is on track in 2021 for the treatment of solid tumors

    --  EMD Serono is projected to commence first-in-human studies of M1231 in
        non-small cell lung cancer (NSCLC) and esophageal squamous cell
        carcinoma in the first quarter of 2021.
    --  Sutro earned a milestone payment during the third quarter of 2020 for
        the successful delivery of GMP clinical supply for Phase 1 clinical
        trial testing of M1231, a bispecific ADC manufactured using XpressCF+
        technology.
    --  Sutro is responsible for manufacturing early clinical supply of the
        bispecific ADC and is eligible for development and regulatory milestones
        and royalties.

Vaxcyte relationship: Demonstrates the power of Sutro's cell-free technology

    --  Under a license from Sutro, Vaxcyte has the right to use the
        XpressCF(®) and XpressCF+(TM) platforms to discover and develop vaccine
        candidates for the treatment or prophylaxis of infectious diseases.
    --  Vaxcyte is progressing their broader spectrum pneumococcal conjugate
        vaccine (VAX-24) through the late stages of preclinical development and
        is targeting an IND filing and clinical study initiation during the
        second half of 2021.
    --  Sutro is eligible to receive four percent (4%) royalties on worldwide
        net sales of any licensed vaccine candidates for human health use. Sutro
        retains the right to discover and develop vaccines for treatment or
        prophylaxis of any disease not caused by an infectious pathogen,
        including cancer.
    --  In June 2020, Vaxcyte closed its initial public offering of its common
        stock. Sutro owns approximately 1.6 million shares of Vaxcyte common
        stock as of September 30, 2020.

Industry Recognition: Recipient of Best New Drug Developer Award at the 7(th) Annual World ADC Awards

    --  The award recognizes the work on STRO-001 and STRO-002, both currently
        in Phase 1 studies, and CC-99712, which is under investigation in a
        Phase 1 trial by collaboration partner BMS.
    --  Sutro's proprietary rapid and precise protein engineering platform
        allows for the design and manufacturing of homogeneous molecules,
        yielding potentially best-in-class ADCs and other therapeutics. Two
        additional candidates from this platform are projected to enter the
        clinic in 2021.

Third Quarter 2020 Financial Highlights

Cash, Cash Equivalents and Marketable Securities

As of September 30, 2020, Sutro had cash, cash equivalents and marketable securities of $202.4 million, as compared to $133.5 million as of December 31, 2019, which represents a net cash increase of $68.9 million during the 2020 nine-month period. The cash, cash equivalents and marketable securities balance noted above does not include the value associated with Sutro's holdings of approximately 1.6 million shares of Vaxcyte common stock, which are subject to a lock-up agreement that expires in December 2020. As of September 30, 2020, the fair value of the Vaxcyte common stock held by Sutro was $78.8 million.

Net Income due to Unrealized Gain on Vaxcyte Common Stock

Sutro recorded net income of $17.1 million and $27.4 million for the three and nine months ended September 30, 2020, respectively, due primarily to an unrealized gain related to its Vaxcyte common stock of $78.6 million during 2020. The unrealized gain consisted of $78.8 million from the change in estimated fair value of Vaxcyte common stock, partially offset by approximately $0.2 million in adjustments related to revaluations of certain Vaxcyte equity items. Vaxcyte common stock held by Sutro will be measured at fair value based on the closing price of Vaxcyte's common stock on the last trading day of each reporting period, with any unrealized gains and losses recorded in Sutro's statements of operations.

Revenue

Revenue was $17.8 million and $34.4 million for the three and nine months ended September 30, 2020, respectively, compared to $12.3 million and $31.4 million for the same periods in 2019, related principally to the Merck, BMS, and EMD Serono collaborations. Future collaboration revenue from Merck, BMS, and EMD Serono, and from any future collaboration partners, will fluctuate as a result of the amount and timing of revenue recognition of upfront, milestones and other collaboration agreement payments.

Operating Expenses

Total operating expenses for the three and nine months ended September 30, 2020, were $28.4 million and $80.7 million, respectively, compared to $25.0 million and $72.1 million for the same periods in 2019, including non-cash stock-based compensation of $8.8 million and $7.6 million, and depreciation and amortization expense of $3.1 million and $3.6 million, in the nine months ended September 30, 2020 and 2019, respectively. Total operating expenses for the third quarter of 2020 were comprised of research and development expenses of $19.4 million and general and administrative expenses of $9.1 million, which are expected to increase in future periods as Sutro's internal product candidates advance in clinical development and additional general and administrative expenses are incurred as a public company.

About Sutro Biopharma

Sutro Biopharma, Inc., located in South San Francisco, is a clinical-stage drug discovery, development and manufacturing company. Using precise protein engineering and rational design, Sutro is advancing next-generation oncology therapeutics.

Sutro's proprietary and integrated cell-free protein synthesis platform XpressCF® and site-specific conjugation platform, XpressCF+(TM), led to the discovery of STRO-001 and STRO-002, Sutro's first two internally-developed ADCs. STRO-001 is a CD74-targeting ADC currently being investigated in a Phase 1 clinical trial of patients with advanced B-cell malignancies, including multiple myeloma and non-Hodgkin lymphoma. STRO-001 was granted Orphan Drug Designation by the FDA for multiple myeloma in October 2018. STRO-002 is a folate receptor alpha (FolR )-targeting ADC, currently being investigated in a Phase 1 clinical trial of patients with ovarian and endometrial cancers. This is the second product candidate to be evaluated in clinical trials resulting from Sutro's XpressCF® and XpressCF+(TM) technology platforms. A third program, CC-99712 (BCMA-targeting ADC), which is part of Sutro's collaboration with Bristol Myers Squibb (formerly Celgene Corporation), is enrolling patients for its Phase 1 clinical trial of patients with multiple myeloma. Sutro's proprietary technology was responsible for the discovery and manufacturing of CC-99712, for which Bristol Myers Squibb has worldwide development and commercialization rights. Sutro is entitled to development and regulatory milestone payments and tiered royalties from Bristol Myers Squibb for this BCMA ADC. Sutro is dedicated to transforming the lives of cancer patients by creating medicines with improved therapeutic profiles for areas of unmet need.

To date, Sutro has designed cytokine-based immuno-oncology therapies, ADCs, vaccines and bispecific antibodies primarily directed at clinically-validated targets for which the current standard of care is suboptimal.

Sutro's platform allows it to accelerate discovery and development of potential first-in-class and best-in-class molecules through rapid and systematic evaluation of protein structure-activity relationships to create optimized homogeneous product candidates.

In addition to developing its own oncology pipeline, Sutro is collaborating with select pharmaceutical and biotech companies to discover and develop novel, next-generation therapeutics. As the pace of clinical development accelerates, Sutro and its partners are developing therapeutics designed to more efficiently kill tumors without harming healthy cells.

Additional multimedia content from Sutro regarding STRO-001 and STRO-002 can be found here and here.

Follow Sutro on Twitter, @Sutrobio, and at www.sutrobio.com to learn more about our passion for changing the future of oncology.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995, including, but not limited to, anticipated preclinical and clinical development activities, timing of announcements of clinical results, potential benefits of the company's product candidates and platform and potential market opportunities for the company's product candidates. All statements other than statements of historical fact are statements that could be deemed forward-looking statements. Although the company believes that the expectations reflected in such forward-looking statements are reasonable, the company cannot guarantee future events, results, actions, levels of activity, performance or achievements, and the timing and results of biotechnology development and potential regulatory approval is inherently uncertain. Forward-looking statements are subject to risks and uncertainties that may cause the company's actual activities or results to differ significantly from those expressed in any forward-looking statement, including risks and uncertainties related to the company's ability to advance its product candidates, the receipt and timing of potential regulatory designations, approvals and commercialization of product candidates, the impact of the COVID-19 pandemic on the Company's business, clinical trial sites, supply chain and manufacturing facilities, the Company's ability to maintain and recognize the benefits of certain designations received by product candidates, the timing and results of preclinical and clinical trials, the company's ability to fund development activities and achieve development goals, the company's ability to protect intellectual property, the value of the Company's holdings of Vaxcyte common stock, and the Company's commercial collaborations with third parties and other risks and uncertainties described under the heading "Risk Factors" in documents the company files from time to time with the Securities and Exchange Commission. These forward-looking statements speak only as of the date of this press release, and the company undertakes no obligation to revise or update any forward-looking statements to reflect events or circumstances after the date hereof.

Investor Contact
Annie Chang
Sutro Biopharma, Inc.
(650) 801-5728
ajchang@sutrobio.com

Media Contact
David Schull
Russo Partners
(212) 845-4271
david.schull@russopartnersllc.com


                                                                       
            
              Sutro Biopharma, Inc.


                                                          
            
              Selected Statements of Operations Financial Data


                                                                            
            
              (Unaudited)


                                                         
            
              (In thousands, except share and per share amounts)




                                           
          
           Three Months Ended                            Nine Months Ended


                                             
          
           September 30,             
            
              September 30,



                                            2020                                   2019                                         2020             2019




     Revenues                                   $
         17,823                                           $
            12,277             $
          34,444     $
          31,431




     Operating expenses



     Research and development                          19,361                                                     16,897                     54,223             48,220



     General and administrative                         9,079                                                      8,115                     26,435             23,897




     Total operating expenses                          28,440                                                     25,012                     80,658             72,117




     Loss from operations                            (10,617)                                                  (12,735)                  (46,214)          (40,686)



     Interest income                                      295                                                        964                      1,320              3,264


      Unrealized gain on equity securities              29,778                                                                               78,638


      Interest and other expense, net                  (2,317)                                                   (1,141)                   (6,328)           (3,533)




     Net income (loss)                          $
         17,139                                         $
            (12,912)            $
          27,416   $
          (40,955)



      Net income (loss) per share, basic           $
         0.46                                           $
            (0.56)              $
          0.91     $
          (1.79)



      Net income (loss) per share, diluted         $
         0.45                                           $
            (0.56)              $
          0.90     $
          (1.79)


                                                   
              
                Sutro Biopharma, Inc.


                                                 
        
                Selected Balance Sheet Financial Data


                                                        
              
                (Unaudited)


                                                      
              
                (In thousands)




                                                     September 30,                                       December 31,


                                                          2020 (1)                                           2019 (2)




     
                Assets


      Cash, cash equivalents and
       marketable securities                                             $
              202,360                          $
      133,473


      Investment in equity
       securities                                                                     78,872



     Accounts receivable                                                              7,483                                6,298


      Property and equipment, net                                                     11,945                                9,633



     Other assets                                                                     6,577                                6,966



                   Total Assets                                          $
              307,237                          $
      156,370



                   Liabilities and Stockholders'
                    Equity


      Accounts payable and other
       liabilities                                                        $
              14,638                           $
      13,045



     Deferred revenue                                                                24,069                               35,660



     Debt                                                                            24,411                                9,876




     Total liabilities                                                               63,118                               58,581



      Total stockholders' equity                                                     244,119                               97,789



                   Total Liabilities and
                    Stockholders' Equity                                 $
              307,237                          $
      156,370


              
                (1)              The
                                               condensed
                                               balance
                                               sheet as of
                                               September
                                               30, 2020
                                               was derived
                                               from the
                                               unaudited
                                               financial
                                               statements
                                               included in
                                               the
                                               Company's
                                               Quarterly
                                               Report on
                                               Form 10-Q
                                               for the
                                               quarter
                                               ended
                                               September
                                               30, 2020,
                                               filed with
                                               the
                                               Securities
                                               and
                                               Exchange
                                               Commission
                                               on November
                                               5, 2020.



              
                (2)              The
                                               condensed
                                               balance
                                               sheet as of
                                               December
                                               31, 2019
                                               was derived
                                               from the
                                               audited
                                               financial
                                               statements
                                               included in
                                               the
                                               Company's
                                               Annual
                                               Report on
                                               Form 10-K
                                               for the
                                               year ended
                                               December
                                               31, 2019,
                                               filed with
                                               the
                                               Securities
                                               and
                                               Exchange
                                               Commission
                                               on March
                                               16, 2020.

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SOURCE Sutro Biopharma