The management of desmoid tumors.

Purpose: To determine the efficacy of different treatment modalities for desmoid tumors.

Materials And Methods: We reviewed the treatment of 40 patients with histologically confirmed desmoid tumors seen at Duke University Medical Center between 1974 and 1990.

Results: Radiotherapy was administered to 16 patients (Group I)--14 with recurrent disease s/p surgery and in two as initial treatment. The average size of the irradiated lesions was 9.3 +/- 3.9 X 8.4 +/- 3.5 cm. With a median follow-up of 57.5 months and a median administered dose of 5400 cGy (mean 5286 cGy, range 4960-5620 cGy), local control has been obtained in 15/16 patients (94%). Complete regression (5/16), partial regression (5/16), or stable disease (5/16) was produced in 15 patients while one patient failed and was salvaged via gross total resection. Continued regression has been seen up to 60 months after treatment. Fourteen patients underwent primary gross total resection and two underwent subtotal resection (Group II). None received post-operative radiotherapy. Three of 14 patients (21%) recurred after gross total resection. All three were salvaged with subsequent gross total resection. After subtotal resection, 2/2 patients recurred. With a mean follow-up of 52 months, 14 patients are without evidence of disease, one is dead with disease (unrelated cause of death), and one was lost to follow-up after recurrence. Eight patients have been treated with combinations of chemotherapy, NSAIDS, anti-estrogens, and immunotherapy with mixed results (Group III). A subset of seven patients with retroperitoneal disease taken from all three groups had large tumor burden (mean size 17 X 15 cm), an infiltrative nature, as well as a difficult location. The disease was surgically resectable in three patients. One is without evidence of disease 9 years after gross total resection alone. Disease has been stabilized with radiotherapy in the other two patients after multiple unsuccessful surgical resections. Of four patients with unresectable disease, two are dead of disease, one died of unrelated causes with disease, and regression of disease was obtained in the other with Gamma-interferon after unsuccessful treatment with tamoxifen and vincristine, doxorubicin, and cyclophosphamide chemotherapy.

Conclusion: Gross total resection is the indicated initial therapy, if it can be performed without significant disfigurement. Radiotherapy is also excellent for obtaining local control, even in patients with a large burden of recurrent disease. Doses in the range of 50 to 55 Gy give a chance of local control equal to that obtained with higher doses previously reported.