On October 19, 2018 SELLAS Life Sciences Group Inc., (Nasdaq: SLS) (SELLAS or the Company), a clinical-stage biopharmaceutical company focused on novel cancer immunotherapies for a broad range of cancer indications, reported that the independent Data Safety Monitoring Board (DSMB) unanimously concluded that the final data from the Phase 2b study of trastuzumab (TZ, Herceptin) +/- nelipepimut-S (NPS, NeuVax) in HER2 1+/2+ breast cancer patients confirms the previously announced findings from the interim analysis of this study (Press release, Sellas Life Sciences, OCT 19, 2018, View Source [SID1234529976]). The DSMB concluded that there was an incremental improvement in the outcomes and statistics with a longer median follow-up (more than 7 months; 26.1 months at final vs. 18.8 months at interim analysis). The final analysis showed no new safety signals and continued to show no difference in cardiotoxicity between TZ + NPS compared to TZ alone. Finally, the DSMB confirmed that the final analysis continues to identify patients with triple negative breast cancer (TNBC) as the key target patient population for development of the NPS + TZ combination in the adjuvant setting in early-stage HER2 1+/2+ breast cancer patients.

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On March 28, 2018, based on a pre-specified interim analysis and the positive TNBC results, the DSMB had recommended to expeditiously seek regulatory guidance by the U.S. Food and Drug Administration (FDA) for further development of the combination of NPS + TZ in TNBC, a population with large unmet medical need.

SELLAS will host a conference call at 8:00 a.m. ET on October 22, 2018, following the oral presentation at the ESMO (Free ESMO Whitepaper) 2018 Annual Meeting of the interim and updated final clinical data from its Phase 2b trial of the combination of trastuzumab (Herceptin) +/- nelipepimut-S (NPS, NeuVax) targeting HER2 low-expressing breast cancer patient cohorts. Management and invited Key Opinion Leaders, Dr. Elizabeth Mittendorf, MD, PhD and Dr. George Peoples, MD, FACS, will participate in the conference call.

Conference Call Details for Monday, October 22, 2018 at 8:00 a.m. ET:

To participate in the conference call, please dial (866) 416-7995 (domestic) or +1 (409) 217-8225 (international) and refer to conference ID 5571389. A live webcast of the call can be accessed under "Events & Presentations" in the Investors section of the Company’s website at www.sellaslifesciences.com.

An archived webcast recording will be available on the SELLAS website beginning approximately two hours after the call.

Details for the ESMO (Free ESMO Whitepaper) presentation are as follows:
Title:Pre-specified interim analysis of a randomized phase 2b trial of trastuzumab + nelipepimut-S (NeuVax) vs trastuzumab for the prevention of recurrence demonstrates benefit in triple negative (HER2 low-expressing) breast cancer patients
Date and Time: 22 October, 2018; 11:54 am Central European Time (5:54 am ET)
Location: Hall A2 – Room 18; Messe Munich Congress Venue, Munich, Germany

Herceptin is a registered trademark of Genentech, Inc. and is not a trademark of SELLAS. The manufacturer of this brand is not affiliated with and does not endorse SELLAS or its products.

About ESMO (Free ESMO Whitepaper)

The European Society for Medical Oncology (ESMO) (Free ESMO Whitepaper) is Europe’s leading non-profit medical oncology organization. ESMO (Free ESMO Whitepaper) is a membership-based society, comprising of 500 expert committee members and 18,000 oncology professionals. ESMO (Free ESMO Whitepaper) organizes a large number of meetings to provide its members and the community with the resources they need and also plays a major role in public policy and European affairs. The ESMO (Free ESMO Whitepaper) 2018 Annual Meeting represents a multi-professional platform for oncology education and exchange, and for immense international visibility for scientific research, and will be held under the tagline "Securing access to optimal cancer care."