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Genocea Reports Second Quarter 2018 Financial and Operating Results

August 2, 2018

Neoantigen vaccine program GEN-009 Phase 1/2a clinical trial underway ATLAS™ platform continues to stand apart from in silico methods of neoantigen identificationConference call today at 9:00 am ET

CAMBRIDGE, Mass., Aug. 02, 2018 (GLOBE NEWSWIRE) -- Genocea Biosciences, Inc. (NASDAQ: GNCA), a biopharmaceutical company developing neoantigen cancer immunotherapies, today reported its financial and operating results for the second quarter ended June 30, 2018.

“We’re proud to announce that we have just initiated the Phase 1/2a clinical trial for GEN-009, our lead neoantigen vaccine candidate,” said Chip Clark, president and chief executive officer of Genocea. “We continue to expect to report the early immunogenicity data from the first patient cohort in the first half of 2019 and remain hopeful these data will provide additional evidence that our ATLAS platform identifies what we call true neoantigens, which we expect to enable more immunogenic and, ultimately, more efficacious vaccines.” Mr. Clark concluded, “This is an exciting time at Genocea, as we believe we are well positioned to help transform cancer treatment.”

Recent Milestones & Events

-- April 2018: Genocea scientists presented data at the 2018 Annual Meeting of the American Association for Cancer Research (AACR) further highlighting the advantages of its ATLAS platform over in silico methods in identifying both neoantigens for vaccine inclusion and “inhibitory” neoantigens for exclusion and detailing the development of a novel model to study the mechanism of inhibitory antigens identified by ATLAS. -- April 2018: Genocea filed an Investigational New Drug (IND) application with the U.S. Food and Drug Administration (FDA) to begin clinical development of GEN-009. -- May 2018: Genocea announced the acceptance of the GEN-009 IND by the FDA. Genocea is currently conducting a Phase 1/2a clinical trial for GEN-009 in patients with a variety of tumor types and expects to report top-line immune response data from the initial patient cohort in the first half of 2019.

Second Quarter 2018 Financial Results

-- Cash Position: As of June 30, 2018, cash and cash equivalents were $44.2 million compared to $12.3 million as of December 31, 2017. -- Research and Development (R&D) Expenses: R&D expenses were $5.3 million for the quarter ended June 30, 2018, compared to $11.4 million for the same period in 2017. This decrease was largely due to reduced headcount, external development, lab, clinical, and other R&D costs. -- General and Administrative (G&A) Expenses: G&A expenses were $4.5 million for the quarter ended June 30, 2018, compared to $3.6 million for the same period in 2017. This increase was primarily due to increased consulting and professional services costs, offset by reduced compensation and benefits costs. -- Other Income (Expense): Other Income for the quarter ended June 30, 2018 was $5.4 million compared to Other Expense of $0.4 million for the same period in 2017. Other Income for the second quarter of 2018 is primarily comprised of the non-cash change in fair value of warrants to purchase shares of Genocea common stock. -- Net Loss: Net loss was $4.4 million for the quarter ended June 30, 2018, compared to a net loss of $15.4 million for quarter ended June 30, 2017.

Financial Guidance Genocea’s financial guidance is unchanged; the company continues to expect that its existing cash and cash equivalents are sufficient to support its operating expenses and capital expenditure requirements into the fourth quarter of 2019.

During the second quarter, under its existing at-the-market equity offering program (ATM), Genocea sold an aggregate of 3.5 million shares of its common stock, receiving approximately $2.9 million in net proceeds after deducting commissions.

Also during the second quarter, Genocea amended its loan and security agreement with Hercules Capital, Inc., to provide up to $14.0 million in debt financing in the form of a term loan. The previous agreement, entered into in 2014, had provided up to $27.0 million in debt financing. This amended loan agreement provides for interest-only payments until June 1, 2019; this date may be extended should certain performance milestones be met.

Genocea continues to explore strategic alternatives for GEN-003, its Phase 3-ready investigational immunotherapy for the treatment of genital herpes.

Conference CallGenocea will host a conference call and webcast today at 9:00 a.m. ET. The conference call may be accessed by dialing (800) 347-6311 (domestic) or (323) 994-2131 (international) and referring to conference ID number 3544411. A live webcast of the conference call will be available online from the investor relations section of the Company’s website at http://ir.genocea.com. A webcast replay of the conference call will be available on the Genocea website beginning approximately two hours after the event and will be archived for 90 days.

About Genocea Biosciences, Inc.Genocea’s mission is to help conquer cancer by designing and delivering targeted vaccines and immunotherapies. While traditional immunotherapy discovery methods have largely used predictive methods to propose T cell targets, or antigens, Genocea has developed ATLAS™, its proprietary technology platform, to identify clinically relevant antigens of T cells based on actual human immune responses. Genocea is using ATLAS in immuno-oncology applications to develop cancer vaccines and immunotherapies. Genocea is currently studying the safety, immunogenicity, and efficacy of its lead neoantigen cancer vaccine, GEN-009, in a Phase 1/2a clinical trial. For more information, please visit www.genocea.com.

Forward-Looking Statements This press release includes forward-looking statements, including statements relating to the expected clinical development of GEN-009, the rate of cash utilized by Genocea in its business, and the period for which existing cash will be able to fund such operation, within the meaning of the Private Securities Litigation Reform Act. Such forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those expressed or implied in such statements. Genocea cautions that these forward-looking statements are subject to numerous assumptions, risks and uncertainties that change over time. Applicable risks and uncertainties include those identified under the heading “Risk Factors” included in Genocea’s Annual Report on Form 10-K for the year ended December 31, 2017 and any subsequent SEC filings. These forward-looking statements speak only as of the date of this press release and Genocea assumes no duty to update forward-looking statements, except as may be required by law.

GENOCEA BIOSCIENCES, INC.CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED)(In thousands)

June 30, 2018 December 31, 2017 ------------- ---------- Cash and cash equivalents $ 44,215 $ 12,273 Other assets 4,825 5,215 Total assets $ 49,040 $ 17,488 - ------ ---- - ------ - Debt, current and long-term $ 14,468 $ 14,311 Accounts payable 1,656 3,516 Accrued expenses and other liabilities 3,136 5,711 Warrant liability 15,915 — -------- ---- -------- - Total liabilities 35,175 23,538 Stockholders’ equity (deficit) 13,865 (6,050 ) Total liabilities and stockholders’ equity (deficit) $ 49,040 $ 17,488 - ------ ---- - ------ -

GENOCEA BIOSCIENCES, INC.CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)(In thousands, except per share amounts)

Three Months Ended Six Months Ended June 30 June 30 2018 2017 2018 2017 -------- - --------- - --------- - --------- - Operating expenses: Research and development $ 5,316 11,427 12,591 21,169 General and administrative 4,472 3,571 7,581 7,205 Total operating expenses 9,788 14,998 20,172 28,374 - ------ - - ------- - - ------- - - ------- - Loss from operations (9,788 ) (14,998 ) (20,172 ) (28,374 ) Other income (expense): Change in fair value of warrants 5,498 — 199 — Interest expense, net (241 ) (370 ) (442 ) (728 ) Other income (expense) 93 (7 ) 87 (8 ) Total other income (expense) 5,350 (377 ) (156 ) (736 ) Net loss $ (4,438 ) $ (15,375 ) $ (20,328 ) $ (29,110 ) - ------ - - ------- - - ------- - - ------- - Other comprehensive loss: Unrealized gain on available-for-sale securities — 3 — — - ------ - - ------- - - ------- - - ------- - Comprehensive loss $ (4,438 ) $ (15,372 ) $ (20,328 ) $ (29,110 ) - ------ - - ------- - - ------- - Net loss per share - basic and diluted $ (0.05 ) $ (0.54 ) $ (0.26 ) $ (1.02 ) - ------ - - ------- - - ------- - - ------- - Weighted-average number of common shares used in 85,538 28,541 78,428 28,519 computing net loss per share - ------ - - ------- - - ------- - - ------- -

Contact: Jennifer LaVin 617-715-6687jennifer.lavin@genocea.com

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