Print OverviewDesmoplastic (des-moe-PLAS-tik) small round cell tumors are a rare and aggressive type of cancer that often starts in the belly. But it can happen in other parts of the body too. Desmoplastic small round cell tumors (DSRCT) begin as a growth of cells. They often form on the tissue that lines the inside of the belly and pelvis. That tissue is called the peritoneum. The cancer cells can quickly spread to other organs, such as the liver, lungs and bones. Desmoplastic small round cell tumors are a type of soft tissue sarcoma. Soft tissue sarcoma is a term used to describe a large group of cancers that all start in the tissues that connect, support and surround other body structures. Desmoplastic small round cell tumors can happen to anyone. But they're more common in teen and young adult males. Treatment for this cancer typically involves a few different options. Those options might include surgery, chemotherapy, radiation therapy and targeted therapy.Products & ServicesA Book: Mayo Clinic Family Health BookNewsletter: Mayo Clinic Health Letter — Digital EditionShow more products from Mayo Clinic SymptomsThe symptoms of desmoplastic small round cell tumors depend on where the cancer begins. Most often it begins in the belly. Signs and symptoms of desmoplastic small round cell tumors in the belly include: Swelling in the belly. Belly pain. Constipation. Nausea. Problems urinating. Weight loss. When to see a doctorMake an appointment with a doctor or other healthcare professional if you have any symptoms that worry you. Request an appointment CausesIt's not clear what causes desmoplastic small round cell tumors. In general, cancer begins when a cell develops changes in its DNA. A cell's DNA contains the instructions that tell a cell what to do. The changes tell the cell to multiply quickly. This creates a clump of cells called a tumor. The cancer cells can invade and destroy healthy body tissue. In time, the cancer cells may break away and spread to other parts of the body. Risk factorsHealthcare professionals haven't found many risk factors for desmoplastic small round cell tumors. This cancer can affect anyone. But it's most common in males who are 15 to 35 years old. By Mayo Clinic Staff Desmoplastic small round cell tumors care at Mayo Clinic Request an appointment Diagnosis & treatment Sept. 19, 2026 Print Living with desmoplastic small round cell tumors? Connect with others like you for support and answers to your questions in the Sarcoma support group on Mayo Clinic Connect, a patient community. Sarcoma Discussions What treatments did you have for angiosarcoma? 13 Replies Sat, Sep 19, 2026 chevron-right Diagnosed with sarcoma? Let's share 1104 Replies Sat, Sep 12, 2026 chevron-right FS-DFSP (Fibrosarcomatous dermatofibrosarcoma): Anyone else? 56 Replies Thu, Sep 10, 2026 chevron-right See more discussions Show references Goldblum JR, et al. Other malignant soft tissue tumors, including those of uncertain type. In: Enzinger and Weiss's Soft Tissue Tumors. 7th ed. Elsevier; 2020. Accessed Aug. 5, 2025. Waqar SHB, et al. Changing incidence and survival of desmoplastic small round cell tumor in the USA. Baylor University Medical Center Proceedings. 2022; doi:10.1080/08998280.2022.2049581. Hovsepyan S, et al. Desmoplastic small round cell tumor: From state of the art to future clinical prospects. Expert Review of Anticancer Therapy. 2023; doi:10.1080/14737140.2023.2200171. Giani C, et al. Long-term survivors with desmoplastic small round cell tumor (DSRCT): Results from a retrospective single-institution case series analysis. Cancer Medicine. 2023; doi:10.1002/cam4.5829. Ryan CW, et al. Clinical presentation, diagnostic evaluation, and staging of soft tissue sarcoma. https://www.uptodate.com/contents/search. Accessed Aug. 6, 2025. Related Products & Services A Book: Mayo Clinic Family Health Book Newsletter: Mayo Clinic Health Letter — Digital Edition Show more products and services from Mayo Clinic Desmoplastic small round cell tumorsSymptoms&causesDiagnosis&treatmentDoctors&departmentsCare atMayoClinic Advertisement Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. Advertising & Sponsorship Policy Opportunities Ad Choices Mayo Clinic Press Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press. NEW: Mayo Clinic Guide to Better Sleep Listen to Health Matters Podcast Mayo Clinic on Incontinence The Essential Diabetes Book FREE Mayo Clinic Diet Assessment Mayo Clinic Health Letter - FREE book CON-20248516 Diseases & Conditions Desmoplastic small round cell tumors