Profile: Stemline Therapeutics Inc (STML.OQ)
10 Dec 2013
Stemline Therapeutics, Inc. (Stemline), incorporated on August 8, 2003, is a clinical-stage biopharmaceutical company focused on discovering, acquiring, developing and commercializing therapeutics that target both cancer stem cells (CSCs) and tumor bulk. The Company is developing two clinical-stage product candidates, SL-401 and SL-701, for which it holds global marketing rights. The indication for SL-401, a biologic-drug conjugate, is acute myeloid leukemia (AML). The indications for SL-701, a synthetic peptide vaccine, are pediatric and adult brain cancer. It has a platform, StemScreen, for the discovery of CSC-targeted compounds, from which it has discovered or validated several of its clinical and preclinical product candidates. Stemline’s StemScreen consists of StemScreen-1 and StemScreen-2 for the identification of CSC-directed compounds.
SL-301 is a small molecule gamma-secretase inhibitor that inhibits Notch, a pathway expressed by CSCs and tumor bulk of multiple cancer types. SL-101 is a monoclonal antibody-based (mAb -based) compound that targets CD123 and has shown in vitro activity against certain hematologic cancers. SL-201 is a small molecule active against certain hematologic and solid tumor types. SL-601 is a mAb-based compound that targets a cell surface marker on bladder CSCs, which is also expressed on a variety of other solid tumor types. It has also in-licensed certain intellectual property directed to mAb-based therapeutics to validated oncology targets, including Glypican-3, Tie-1, CD133, Frizzled, Smoothened and Patched.
SL-401 - An IL-3R-Directed Compound Targeting Cancer Stem Cells and Tumor Bulk
SL-401 is a clinically active biologic-drug conjugate consisting of human interleukin-3 (IL-3) genetically linked to a truncated version of diphtheria toxin. SL-401 targets the IL-3 receptor (IL-3R), which is overexpressed on both the CSCs and tumor bulk of multiple hematologic cancers, including AML. SL-401 has demonstrated preclinical in vitro and in vivo activity against both leukemia blasts (which includes tumor bulk) and CSCs of a range of human leukemia cell lines and primary leukemia cells from patients.
SL-701 is a clinically active synthetic peptide vaccine that targets several epitopes on CSCs and tumor bulk of brain cancer. In two completed Phase 1/2 clinical trials, SL-701 demonstrated single agent anti-tumor activity in pediatric patients with newly diagnosed brainstem glioma (BSG) and other high-grade gliomas (HGGs) and in adult patients with refractory or recurrent GBM, and other HGGs.
StemScreen-1 is a drug discovery platform designed to identify CSC-targeted compounds based on the isolation of CSCs and evaluation of CSC gene expression profiles. CSCs are isolated from primary tumor tissue or cell lines, and then subjected to gene expression analysis using a variety of technologies, including microarray. A control tissue, such as normal bone marrow is analyzed as a comparator against the gene expression profile of the isolated CSCs. These data are then interfaced with an information base of compounds and their mechanisms of action (that is which gene products and pathways they impact). It has utilized StemScreen-1 to discover a number of its preclinical drug candidates. These include SL-201, SL-301, and SL-601. In addition, SL-401 demonstrated activity against CSCs as determined by both an in vitro colony formation and in vivo animal implantation assay, thereby validating certain StemScreen-1 anti-CSC assays.
StemScreen-2 is a high throughput drug discovery platform it is developing to discover anti-CSC compounds. StemScreen-2 utilizes a cell-based assay that can track and follow CSCs in their natural state during high throughput screening. In particular, StemScreen-2 utilizes a CSC-specific promoter linked to a reporter as a method for identifying and following CSCs in their native environment of surrounding tumor bulk. In this way, StemScreen-2 enables the identification of compound hits, in a high throughput manner, with anti-CSC activity.
The Company competes with Boston Biomedical, Inc., Eclipse Therapeutics, Inc., OncoMed Pharmaceuticals, Inc., Verastem, Inc., Astellas Pharma US, Inc., Boehringer Ingelheim GmbH, Dainippon Sumitomo Pharma Co. Ltd., Geron Corp., GlaxoSmithKline plc, ImmunoCellular Therapeutics, Ltd, Macrogenics Inc., Amgen, Inc., Pfizer Inc., Roche Holding AG, Sanofi U.S. LLC., Cyclacel Pharmaceuticals, Inc., Sunesis Pharmaceuticals Inc., Clavis Pharma ASA, Ambit Biosciences Corporation, Celgene Corporation, Eisai Co. Ltd., Celator Pharmaceuticals, Inc., Merck & Co., Inc., Eisai Co., Inc., Roche Holding AG, Novartis AG and Celldex Therapeutics, Inc.
Stemline Therapeutics Inc
Eleventh Floor, 750 Lexington Av
NEW YORK NY 10022