Sutro Biopharma Announces Update from STRO-002, Luveltamab Tazevibulin (Luvelta), Phase 1 Dose-Expansion Study and Registrational Plans in Advanced Ovarian Cancer

2023-01-09

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- Results from the STRO-002 (luvelta) Phase 1 dose-expansion study demonstrate that FolRα-selected patients experienced meaningful clinical benefit, with 43.8% ORR, median DOR of 5.4 months, and median PFS of 6.6 months at the higher starting dose of 5.2mg/kg -

- Meaningful clinical benefit was observed in FolRα-selected patients, defined as TPS>25%, which is potentially 80% of the advanced ovarian cancer patient population -

- Safety profile is generally consistent with prior data with asymptomatic neutropenia being the primary adverse event; no new safety signals were observed -

- Use of prophylactic pegfilgrastim reduced dose delays and neutropenia -

- Sutro plans to initiate Phase 2/3 registration-directed study called REFRaME in second quarter of 2023 -

SOUTH SAN FRANCISCO, CA, USA I January 09, 2023 I Sutro Biopharma, Inc. (Sutro or the Company) (NASDAQ: STRO), a clinical-stage oncology company pioneering site-specific and novel-format antibody drug conjugates (ADCs), today announced results from a Phase 1 dose-expansion study of STRO-002 (luvelta), a novel Folate receptor alpha (FolRα)-targeting ADC and interim safety data from exploratory cohort C, a cohort of 15 patients with advanced ovarian cancer treated at the higher dose of luvelta, (5.2mg/kg), along with prophylactic pegfilgrastim. Additionally, the company provided details on the design of the registration-directed Phase 2/3 study, REFRaME, to start in the second quarter of 2023.

Results demonstrated that luvelta provided substantial clinical benefit in FolRα-selected patients, defined by Tumor Proportion Score (TPS) of >25%, with a 37.5% overall response rate (ORR), median duration of response (median DOR) of 5.5 months, and median progression free survival (median PFS) of 6.1 months, regardless of starting dose. Results also demonstrated the higher starting dose of 5.2 mg/kg providing greater patient benefit compared to the lower dose of 4.3mg/kg. FolRα-selected patients account for approximately 80% of the patient population in advanced ovarian cancer, as represented in the patient stratification in the Phase 1 study.

Consistent with prior luvelta data, the primary adverse event from the dose-expansion cohort was predominantly asymptomatic neutropenia, with no meaningful ocular toxicity signals or complications reported.

In cohort C, an additional 15 patients with advanced ovarian cancer were enrolled and treated with prophylactic pegfilgrastim on Day 8 after each 5.2 mg/kg administration of luvelta. Initial data on neutropenia and dose delays were available on the first 10 patients, which showed that patients in cohort C experienced substantial decreases in neutropenia and potential increases in dose intensity, due to decreased dose delays.

“Today, patients with this form of heavily pre-treated ovarian cancer have extremely limited treatment options available to them, and unfortunately, experience poor outcomes,” said Dr. R. Wendel Naumann, Professor and Director of Gynecologic Oncology Research and Associate Medical Director of Clinical Trials at the Levine Cancer Institute, Atrium Health in Charlotte, North Carolina, and a co-lead principal investigator in the STRO-002-GM1 studies. “To date, luvelta continues to demonstrate encouraging efficacy data, which was further supported by results from the dose-expansion cohort. The safety profile was shown to be manageable and notably devoid of ocular complications across a broad spectrum of patients with FolRα-selected ovarian cancer.”

Commented Bill Newell, Chief Executive Officer of Sutro: “We are pleased with our Phase 1 dose-expansion efficacy data, which are generally consistent with previously reported results and demonstrate luvelta’s potential in a difficult-to-treat patient population. Through the addition of cohort C, we were able to evaluate patients at the higher dose of luvelta at 5.2mg/kg with the use of prophylactic pegfilgrastim and determined that the rates of asymptomatic neutropenia and dose delays could be diminished. Our meeting with the FDA in 2022 provided a framework for our path forward on the registration-directed Phase 2/3 trial for platinum resistant ovarian cancer patients, called REFRaME, which we plan to initiate in the second quarter of 2023.”

Summary of Results from Phase 1 Dose-Expansion Study

Planned Phase 2/3 Study Details

As discussed with the U.S. Food and Drug Administration (FDA), the Phase 2/3 REFRaME study is planned to begin with a randomized, run-in dose confirmation phase. In this phase of the trial, 25 patients will be evaluated at the 5.2 mg/kg dose with pegfilgrastim delivered prophylactically for two cycles followed by a step-down dose to 4.3 mg/kg. The other 25 patients will be evaluated from the start at the 4.3 mg/kg dose without prophylactic pegfilgrastim. Following this 50-patient phase of the study, additional patients will be randomized between these two luvelta dose levels, and standard of care (chemotherapy). Upon agreement with FDA on the go-forward dose versus standard of care, the dose level of luvelta not chosen will be dropped. Upon having data on approximately 110 patients in the selected dose of luvelta arm, Sutro Sutro will look to apply for accelerated approval based on ORR as the primary endpoint. At the end of the Phase 3 portion of the trial, full approval can be sought based on PFS as the primary endpoint comparing the luvelta arm (n=160) and the standard of care arm (n=160).

About Sutro Biopharma

Sutro Biopharma, Inc., headquartered in South San Francisco, is a clinical-stage oncology company pioneering site-specific and novel-format antibody drug conjugates (ADCs). Sutro has two wholly owned ADCs in the clinic—STRO-002, a folate receptor alpha (FolRα)-targeting ADC folate receptor alpha (FolRα)-targeting ADC, in clinical studies for ovarian and endometrial cancers; and STRO-001, a CD74-targeting ADC CD74-targeting ADC, in clinical studies for B-cell malignancies. Additionally, Sutro is collaborating with Bristol Myers Squibb (BMS) on CC-99712, a BCMA-targeting ADC in the clinic for patients with multiple myeloma; with Merck KGaA, Darmstadt, Germany, known as EMD Serono in the U.S. and Canada (EMD Serono), on M1231, a MUC1-EGFR bispecific ADC in clinical studies for patients with solid tumors, particularly non-small cell lung cancer (NSCLC) and esophageal squamous cell carcinoma; with Merck, known as MSD outside of the United States and Canada, on MK-1484, a selective IL-2 agonist IL-2 agonist in clinical studies as a monotherapy and in combination with pembrolizumab for the treatment of solid tumors; and with Astellas Pharma (Astellas) on novel modality, immunostimulatory antibody-drug conjugates (iADCs). Sutro’s platform technology also enabled the spin out of Vaxcyte and the creation of VAX-24, a 24-valent pneumococcal conjugate vaccine in clinical studies for the prevention of invasive pneumococcal disease. Sutro’s rational design and precise protein engineering has enabled six product candidates in the clinic. Follow Sutro on Twitter, @Sutrobio, and at www.sutrobio.com to learn more about our passion for changing the future of oncology.

SOURCE: Sutro Biopharma