Osteosarcoma (OS) and leiomyosarcoma (LMS) are exceedingly rare cancers, both subtypes of sarcoma, that arise in bone and smooth muscle respectively. There has been a failure to improve survival rates or decrease treatment-related morbidity in OS/LMS due to insufficient characterization of the genomic landscape, resulting in a lack of targeted therapeutic approaches, diagnostic methods, and preventive strategies. There is an urgent need for a large, shared database of clinical and genomic data in OS and LMS. Yet, because of the rarity of these tumor types as well as other challenges in patient recruitment and the genomic characterization of these tumors, to date it has been difficult to generate this data. The overarching goal of this proposal is to engage adult and pediatric participants with OS and LMS as partners to generate a shared database of clinical, genomic, molecular, and patient-reported data. This should accelerate discoveries that drive novel treatment strategies, new clinical trials, and new standards of care. The Count Me In PE-CGS U2C Research Center will leverage our experience in patient engagement, genome characterization, computational analysis, and behavioral research to create and launch two patient-partnered projects to generate this clinicogenomic data. We will build two websites with patients in the OS and LMS communities—the Osteosarcoma Project (OSproject) and the Leiomyosarcoma Project (LMSproject)—and consent 3,000 patients over the course of the study. We will collect medical records, patient-reported data, archival tumor tissue samples, and saliva and blood for genomic analysis. We will generate clinically annotated genomic data from at least 750 tumor specimens, 500 circulating tumor DNA specimens, and corresponding germline specimens and share the de-identified data widely. At the same time, we will study and optimize the approach to patient engagement in cancer research, particularly among rural and minority participants and participants across a range of literacy levels, ages, and stages in development. To accomplish these goals, we will build on a well-established interdisciplinary team from the Broad Institute and Dana-Farber Cancer Institute with members who have pioneered these approaches. Our leadership (Wagle, Janeway) and Units are comprised of experts in patient-partnered cancer research (Wagle, Painter), sarcoma clinical and translational research (Janeway, George, Crompton, Raut), genome characterization, analysis, and clinical interpretation (Gabriel, Getz, Van Allen, Wagle, Janeway), computational biology/data science (Getz, Van Allen, Philippakis), and behavioral science (Mack, Rebbeck). Our Center will uncover the key clinicogenomic features of OS/LMS, integrate them into a single comprehensive database with a goal of accelerating research and improving the lives of these patients. In doing so, we also aim to present a general approach to patient-partnered research that can be disseminated broadly and applied to other tumors types and patient communities.

Rare cancers comprise over 25% of tumors in U.S. adults, but due to low incidence and geographically dispersed patient populations, they are challenging to study, leading to significant unmet clinical needs. This proposal will form a Research Center that will directly engage patients with two such rare cancers – osteosarcoma and leiomyosarcoma – as partners in research in order to generate a large shared database of clinical, genomic, molecular, and patient reported data. We hope that this work can accelerate discoveries that drive novel treatment strategies, new clinical trials, and new standards of care, and also serve as a model for patient- partnered research in other cancer types and patient communities.