Syros Pharmaceuticals (NASDAQ:SYRS), a biopharmaceutical company committed to advancing new standards of care for the frontline treatment of hematologic malignancies, today announced that it will discontinue enrollment in the SELECT-AML-1 Phase 2 clinical trial evaluating the triplet regimen of tamibarotene in combination with venetoclax and azacitidine compared to the doublet regimen of venetoclax and azacitidine in newly diagnosed, unfit patients with acute myeloid leukemia (AML) and RARA gene overexpression. This decision is based on the results of a prespecified interim analysis of the trial.

Data from 51 patients enrolled in SELECT-AML-1 were reviewed on August 9, 2024. This review included a prespecified non-binding futility analysis conducted on the first 40 randomized patients after the fortieth randomized patient received approximately three months of study drug or discontinued treatment. A similar complete response (CR)/complete response with incomplete hematologic recovery (CRi) rate was observed in the triplet arm (n=20; 65%, CI: 40.8-84.6) and the doublet arm (n=20; 70%, CI: 45.7-88.1). As a result, the probability for success of the SELECT-AML-1 study to demonstrate superiority at the final analysis in 80 randomized patients was considered low, and Syros made the decision to discontinue further enrollment. There were no new safety signals associated with the use of tamibarotene in combination with venetoclax and azacitidine. Patients currently enrolled in SELECT-AML-1 will have the opportunity to remain on study at the discretion of study investigators. Syros plans to present data from SELECT-AML-1 at the 12th Annual Meeting of the Society of Hematologic Oncology (SOHO) in September 2024.

“We are disappointed by this unexpected outcome, especially for people living with AML," said David A. Roth, M.D., Chief Medical Officer of Syros. “In our prior Phase 2 clinical trial, the doublet combination of tamibarotene and azacitidine delivered a 61% CR/CRi rate in newly diagnosed AML patients with RARA overexpression. This supports our conviction in pursuing a doublet strategy in higher-risk MDS, where we are comparing tamibarotene and azacitidine to azacitidine alone. We remain steadfast in our commitment to delivering tamibarotene for the treatment of HR-MDS and look forward to sharing pivotal data from SELECT-MDS-1 by mid-fourth quarter."

Syros continues to evaluate tamibarotene, an oral, selective, retinoic acid receptor alpha (RARα) agonist, in combination with azacitidine in the SELECT-MDS-1 Phase 3 clinical trial in newly diagnosed higher-risk myelodysplastic syndrome (MDS) patients with RARA gene overexpression. The SELECT-MDS-1 trial passed a prespecified futility analysis in the first quarter of 2024 and is continuing as planned, with pivotal CR data expected by the middle of the fourth quarter of 2024.

About Syros Pharmaceuticals

Syros is committed to developing new standards of care for the frontline treatment of patients with hematologic malignancies. Driven by the motivation to help patients with blood disorders that have largely eluded other targeted approaches, Syros is developing tamibarotene, an oral selective RARα agonist in frontline patients with higher-risk myelodysplastic syndrome with RARA gene overexpression. For more information, visit www.syros.com and follow us on X (@SyrosPharma) and LinkedIn.

Cautionary Note Regarding Forward-Looking Statements

This press release contains forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995, including without limitation statements regarding Syros’ clinical development plans, the progression of its clinical trials, the timing to report clinical data, and the ability to commercialize tamibarotene and deliver benefit to patients. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “hope,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “target,” “should,” “would,” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Actual results or events could differ materially from the plans, intentions and expectations disclosed in these forward-looking statements as a result of various important factors, including Syros’ ability to: advance the development of its programs under the timelines it projects in current and future clinical trials; demonstrate in any current and future clinical trials the requisite safety, efficacy and combinability of its drug candidates; sustain the response rates and durability of response seen to date with its drug candidates; successfully develop a diagnostic test to identify patients with the RARA biomarker; obtain and maintain patent protection for its drug candidates and the freedom to operate under third party intellectual property; obtain and maintain necessary regulatory approvals; identify, enter into and maintain collaboration agreements with third parties; manage competition; manage expenses; raise the substantial additional capital needed to achieve its business objectives; attract and retain qualified personnel; and successfully execute on its business strategies; risks described under the caption “Risk Factors” in Syros’ Annual Report on Form 10-K for the year ended December 31, 2023 and Quarterly Report on Form 10-Q for the quarters ended March 31, 2024 and June 30, 2024, each of which is on file with the Securities and Exchange Commission; and risks described in other filings that Syros makes with the Securities and Exchange Commission in the future.

Syros Contact Karen Hunady Director of Corporate Communications & Investor Relations 1-857-327-7321 khunady@syros.com

Investor Contact Amanda Isacoff Precision AQ 212-362-1200 amanda.isacoff@precisionaq.com

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