SOUTH SAN FRANCISCO, CA--(Marketwire - September 08, 2008) - Cytokinetics, Incorporated (NASDAQ: CYTK) announced that data from its ongoing Phase I/II clinical trial of ispinesib were presented in a poster at the 2008 American Society of Clinical Oncology (ASCO) Breast Cancer Symposium held on September 5-7, 2008 in Washington, DC.