SLS SELLAS LIFE SCIENCES GROUP INC Investments/Divestments 8-K Filing 2023 - Lease Extension SELLAS Life Sciences Group, Inc. entered into a Second Amendment to Sublease with Times Square Tower Associates LLC, extending the lease term for certain premises in New York until September 30, 2025.Get access to all SEC 8-K filings of the SELLAS LIFE SCIENCES GROUP INC