Proton Beam Radiation Therapy and Cisplatin in Treating Patients With Stage IB, Stage II, Stage III, or Stage IVA Cervical Cancer and Positive Lymph Nodes

RATIONALE: Specialized radiation therapy, such as proton beam radiotherapy, that delivers a high dose of radiation directly to the tumor may kill more tumor cells and cause less damage to normal tissue. Drugs used in chemotherapy, such as cisplatin, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Giving radiation therapy with chemotherapy may kill more tumor cells. PURPOSE: This phase II trial is studying how well giving proton beam radiation therapy together with cisplatin works in treating patients with stage IB, stage II, stage III, or stage IVA cervical cancer and positive lymph nodes.