Phase II Decentralized Pragmatic Trial of Adjuvant Doxorubicin - Trabectedin Chemotherapy in uLMS

To find out if receiving standard chemotherapy (doxorubicin and trabectedin) can extend the cancer-free survival of patients with Stage 1b/2 uterine leiomyosarcoma who had surgery that fully removed the tumor.

Inclusion Criteria: * Patients must have histologically confirmed uterine leiomyosarcoma * Patients must have localized tumors, AJCC stages 1b to 3 according to the AJCC uterine sarcoma staging system (high risk of relapse population) * Patients must have had complete surgical resection of tumor within 3 months prior to initiation of adjuvant chemotherapy, complete surgical resection includes at least a total hysterectomy * Patients must have no evidence of residual disease, as proven by CT Chest-Abdomen-Pelvic within 28 days before randomization (exclude potential metastatic patients) * Patients must have no history of pelvic radiation (hematologic tolerance of chemotherapy is impaired by pelvic radiation) * No prior chemotherapy for the treatment of the uterine leiomyosarcoma * Age ≥18 years. Because no dosing or adverse event data are currently available on the use of doxorubicin in combination with trabectedin in patients \