 EL SEGUNDO, Calif.--BUSINESS WIRE--NantKwest, Inc. NASDAQ: NK, a clinical-stage, natural killer cell-based therapeutics company, today announced its participation in the virtual 32nd Annual Piper Sandler Healthcare conference, which takes place December 1-3, 2020. NantKwest Executive Chairman Patrick Soon-Shiong, M.D., and Chief Executive Officer Rich Adcock will participate in institutional investor meetings on Tuesday, December 1; meetings may be requested through Piper Sandler. Additiona 