Stemline Therapeutics Announces Exercise of Option to Purchase Additional Shares

NEW YORK, May 23, 2013 (GLOBE NEWSWIRE) -- Stemline Therapeutics, Inc. (Nasdaq:STML), a clinical-stage biopharmaceutical company developing oncology therapeutics that target both cancer stem cells (CSCs) and tumor bulk, today announced that the underwriters have exercised in full their option to purchase an additional 620,689 shares of common stock. The option to purchase additional shares is being exercised in connection with Stemline's previously announced public offering of 4,137,931 shares of common stock at a public offering price of $14.50 per share. As a result of the exercise of the option, the total gross proceeds to Stemline from the offering are expected to be approximately $69,000,000, before deducting underwriting discounts and commissions and other estimated offering expenses. The closing of the option to purchase additional shares is expected to occur on or about May 28, 2013.

Jefferies LLC and Aegis Capital Corp. acted as joint book-running managers for the offering. Roth Capital Partners acted as co-lead manager for the offering.

A registration statement relating to these securities was declared effective by the Securities and Exchange Commission on May 16, 2013.

This offering was made by means of a prospectus. Copies of the prospectus relating to this offering may be obtained by contacting Jefferies LLC, Attention: Equity Syndicate Prospectus Department, 520 Madison Avenue, 12th Floor, New York, NY, 10022, or by telephone at 877-547-6340, or by email at or Aegis Capital Corp., Attention: Prospectus Department, 810 Seventh Avenue, 18th Floor, New York, NY 10019, or by telephone at 212-813-1010, or by email at Investors may also obtain these documents for no charge by visiting the SEC's website at

This press release shall not constitute an offer to sell, or a solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Stemline:

Stemline Therapeutics, Inc. is a clinical-stage biopharmaceutical company developing novel oncology therapeutics that target both cancer stem cells (CSCs) as well as the tumor bulk. Among Stemline's drug candidates are SL-401 and SL-701, both of which have demonstrated clinical activity, including durable complete responses (CRs), and an overall survival (OS) benefit versus historical controls in Phase 1/2 studies of patients with advanced hematological and brain cancer, respectively. For more information about Stemline Therapeutics, visit

CONTACT: Stemline Contact: Mark Jacobson Director, Corporate Development Stemline Therapeutics, Inc. 750 Lexington Avenue Sixth Floor New York, NY 10022 Tel: 646-502-2307 Email: mjacobson@stemline.comSource:Stemline Therapeutics, Inc.