https://www.classaction.org/news/woman-claims-giostar-misrepresented-efficacy-of-stem-cell-treatment-for-cancer-other-diseases Woman Claims Misrepresented Efficacy of Stem Cell Treatment for Cancer, Other Diseases. A proposed class action lawsuit alleges the companies and individuals behind Stem cell have fraudulently touted both the efficacy of using stem cells to treat a number of blood-related diseases and their own apparent qualifications and affiliations within the medical community.