This study is a patient registry of people with Desmoplastic Small Round Cell Tumor (DSRCT). A patient registry is a collection of health information about a group of people, and it is usually focused on a specific diagnosis or disease.

The purpose of this registry is to create a database- a collection of information-or better understanding DSRCT. Researchers will use the information from this database to learn more about DSRCT and for current and future research on DSRCT.

Inclusion Criteria:

• Participants must have a diagnosis of desmoplastic small round cell tumor
• Participants may be of any age as long as the appropriate consent and assent may be obtained
• Willing to provide historical and longitudinal clinical data

Exclusion Criteria:

• Participant unwilling to provide consent or share historical and longitudinal clinical data

The study is a registry protocol for patients with DSRCT.

Memorial Sloan Kettering Cancer Center supports the international committee of medical journal editors (ICMJE) and the ethical obligation of responsible sharing of data from clinical trials. The protocol summary, a statistical summary, and informed consent form will be made available on clinicaltrials.gov when required as a condition of Federal awards, other agreements supporting the research and/or as otherwise required. Requests for deidentified individual participant data can be made beginning 12 months after publication and for up to 36 months post publication. Deidentified individual participant data reported in the manuscript will be shared under the terms of a Data Use Agreement and may only be used for approved proposals. Requests may be made to: crdatashare@mskcc.org.