Oral presentation of initial data from the Phase 1/2 TRESR trial at the AACR-NCI-EORTC conference

Results demonstrated favorable and differentiated safety profile, along with promising early activity, for RP-3500 in patients with a range of synthetic-lethal genomic alterations

Gross Proceeds of $101.2 Million Raised in Upsized Follow-on Public Offering

Thomas Civik appointed to Board of Directors as new Chairman

Repare Therapeutics Inc. (“Repare” or the “Company”) (Nasdaq: RPTX), a leading clinical-stage precision oncology company enabled by its proprietary synthetic lethality approach to the discovery and development of novel therapeutics, today reported financial results for the third quarter ended September 30, 2021.

“We are pleased with the progress we’ve made this quarter in our Phase 1 part of the RP-3500 program, including the comprehensive safety data and emerging evidence of activity from the TRESR study which was part of the featured oral presentation at the AACR-NCI-EORTC conference this year,” said Lloyd M. Segal, President and Chief Executive Officer of Repare. “The findings continue to suggest RP-3500 may have broad clinical efficacy in tumors with diverse genetic alterations and provides further clinical proof of concept and validation of our SNIPRx platform. We look forward to providing updates in the future on the potential of RP-3500, both as a monotherapy and in combination with PARP inhibitors.”

Third Quarter 2021 Review and Operational Updates:

• Announced initial monotherapy clinical data from Phase 1/2 TRESR study of RP-3500 in patients with solid tumors at the AACR-NCI-EORTC conference
  • Early data showed RP-3500 appears safe and well tolerated. The most common treatment emergent adverse events in any of the 101 patients treated, expectedly, was grade 1-2 anemia, with only 21.8% of all patients experiencing Grade 3 anemia (no Grade 4). There were no discontinuations related to RP-3500 emergent adverse events and dose interruptions, and reductions or red blood cell transfusions were infrequent on the recommended 3 days on/4 days off weekly regimen.
  • Recommended Phase 2 dose and schedule for further monotherapy RP-3500 evaluation was determined to be 160mg, taken weekly for 3 days on and 4 days off. This schedule assures repeated weekly exposure to RP-3500 at an efficacious dose. The Grade 3 anemia rate at this schedule overall was only 14.5%.
  • Antitumor activity, defined as RECIST based objective responses, was observed in patients with tumors harboring SNIPRX predicted genomic alternations at doses >100mg (ATM, CDK12, BRCA1, BRCA2, RAD51C), across multiple tumor types and included patients after PARP inhibitor failure. Meaningful clinical benefit was observed in 49% of 69 patients with available scans. Those include 12 patients with tumor responses per established international efficacy criteria, 14 patients with ongoing stable disease for at least 16 weeks and an additional 8 patients with stable disease who only had two radiological evaluations, but had demonstrated significant decreases in tumor markers or initial tumor shrinkage of less than 30%. Promising deep molecular responses in circulating tumor DNA (ctDNA) for tumors with STEP² genomic alterations were observed in a subset of patients available for serial ctDNA analysis.
  • Final readouts from patients enrolled in the monotherapy arm of the TRESR trial, as well as initial data from the combination arm testing RP-3500 together with PARP inhibitors, are expected in 2022.
    
    
    
    
• Raised Gross Proceeds of $101.2 Million in Upsized Follow-on Public Offering
  • In November 2021, the Company announced the closing of an upsized unwritten follow-on public offering yielding aggregate gross proceeds of approximately $101.2 million, or net proceeds of approximately $93.9 million, after deducting underwriting commissions and estimated offering expenses of $1.2 million payable by us. All of the shares in the offering were offered by Repare Therapeutics.

• Appointed Thomas Civik to Board of Directors as new Chairman
  • In September 2021, the Company appointed Thomas Civik to its Board of Directors as its Chairman. He replaced Jerel Davis, Ph.D., who remains a Board member.
  • Mr. Civik was most recently President and CEO of Five Prime Therapeutics until its $1.9 billion acquisition by Amgen in April 2021. He has over 25 years of leadership and commercial experience at various companies including Foundation Medicine and Genentech.

• Achieved $0.9 million (¥100 million) research trigger pursuant to the terms of its research services, license and collaboration agreement with Ono Pharmaceutical Co., Ltd
  • On October 13, 2021, upon the occurrence of a specified research trigger, the Company became eligible to receive a portion, amounting to ¥100 million ($0.9 million), of the research service payments provided for in its research services, license and collaboration agreement with Ono Pharmaceutical Co., Ltd., or Ono, ("Ono Agreement") for the research of potential product candidates targeting Polθ. Furthermore, on October 29, the Company and Ono entered into an amendment to the Ono Agreement whereby the Research Term, as defined in the Ono Agreement, was extended by one year.

Third Quarter 2021 Financial Results:

• Cash and cash equivalents, restricted cash and marketable securities: Cash and cash equivalents, restricted cash and marketable securities as of September 30, 2021 were $268.2 million, exclusive of the proceeds from the follow-on public offering.

• Research and development expenses, net of tax credits (Net R&D): Net R&D expenses were $25.4 million and $62.1 million for the three- and nine-month periods ended September 30, 2021, respectively, as compared to $10.1 million and $27.7 million for the three- and nine-month periods ended September 30, 2020, respectively. The increase in R&D expenses for the three and nine-month periods were primarily due to increases in development costs related to the Company’s RP-3500 and RP-6306 programs, as well as increases in personnel related expenses, including share-based compensation.

• General and administrative (G&A) expenses: G&A expenses were $6.6 million and $18.6 million for the three and nine-month periods ended September 30, 2021, respectively, as compared to $4.0 million and $9.6 million for the three and nine-month periods ended September 30, 2020, respectively. The increase in G&A expenses for the three and six-month periods were due to personnel related costs, including share-based compensation, and D&O insurance which increased as a result of the Company’s IPO in June 2020.

• Net loss: Net loss was $30.9 million, or $0.83 per share and $78.6 million, or $2.12 per share, in the three and nine-month periods ended September 30, 2021, respectively, and $13.8 million, or $0.37 per share and $38.2 million, or $2.63 per share in the three and nine-month periods ended September 30, 2020, respectively.

About Repare Therapeutics’ SNIPRx® Platform

Repare’s SNIPRx® platform is a genome-wide CRISPR-based screening approach that utilizes proprietary isogenic cell lines to identify novel and known synthetic lethal gene pairs and the corresponding patients who are most likely to benefit from the Company’s therapies based on the genetic profile of their tumors. Repare’s platform enables the development of precision therapeutics in patients whose tumors contain one or more genomic alterations identified by SNIPRx® screening, in order to selectively target those tumors in patients most likely to achieve clinical benefit from resulting product candidates.

About Repare Therapeutics, Inc.

Repare Therapeutics is a leading clinical-stage precision oncology company enabled by its proprietary synthetic lethality approach to the discovery and development of novel therapeutics. The Company utilizes its genome-wide, CRISPR-enabled SNIPRx® platform to systematically discover and develop highly targeted cancer therapies focused on genomic instability, including DNA damage repair. The Company’s pipeline includes its lead product candidate RP-3500, a potential leading ATR inhibitor currently in Phase 1/2 clinical development, its second clinical candidate, RP-6306, a PKMYT1 inhibitor currently in Phase 1 clinical development, a Polθ inhibitor program, as well as eight other early-stage, pre-clinical programs. For more information, please visit reparerx.com.

SNIPRx® is a registered trademark of Repare Therapeutics Inc.

Forward-Looking Statement

This press release contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. All statements in this press release other than statements of historical facts are “forward-looking statements. These statements may be identified by words such as “aims,” “anticipates,” “believes,” “could,” “estimates,” “expects,” “forecasts,” “goal,” “intends,” “may,” “plans,” “possible,” “potential,” “seeks,” “will” and variations of these words or similar expressions that are intended to identify forward-looking statements, although not all forward-looking statements contain these words. Forward-looking statements in this press release include, but are not limited to, statements regarding the clinical development of the Company’s pipeline and its research and development programs, including the anticipated timing, anticipated patient enrollment, trial outcomes or associated costs of its clinical trials of RP-3500 and RP-6306; and the Company’s ability to advance RP-6306, both as monotherapy and in combination with chemotherapies and other agents, into proof-of-concept trials in 2022. These forward-looking statements are based on the Company’s expectations and assumptions as of the date of this press release. Each of these forward-looking statements involves risks and uncertainties that could cause the Company’s clinical development programs, future results or performance to differ materially from those expressed or implied by the forward-looking statements. Many factors may cause differences between current expectations and actual results, including the impacts of the COVID-19 pandemic on the Company’s business, clinical trials and financial position, unexpected safety or efficacy data observed during preclinical studies or clinical trials, clinical trial site activation or enrollment rates that are lower than expected, changes in expected or existing competition, changes in the regulatory environment, the uncertainties and timing of the regulatory approval process, and unexpected litigation or other disputes. Other factors that may cause the Company’s actual results to differ from those expressed or implied in the forward-looking statements in this press release are identified in the section titled "Risk Factors" in the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2021 filed with the Securities and Exchange Commission (“SEC”) and the Québec Autorité des Marchés Financiers ("AMF") on August 12, 2021, and its other documents subsequently filed with or furnished to the SEC and AMF. The Company expressly disclaims any obligation to update any forward-looking statements contained herein, whether as a result of any new information, future events, changed circumstances or otherwise, except as otherwise required by law.

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