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Acute Toxicity of Three Dimensional Conformal Concurrent Chemoradiation with Dose Optimization for External Beam Radiation in Carcinoma Cervix—A Prospective Study

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2016年第3期5卷 204-211页

作者： Sathish Balachandran shyama prem sudha Reddy KS Saravanan Kandasamy Department of Radiotherapy JIPMER Puducherry India Department of Radiotherapy MGMC Puducherry India Department of Medical Physics JIPMER Puducherry India

Aim: To prospectively evaluate the acute toxicity of 3D conformal radiotherapy with dose optimization in patients with carcinoma cervix. Materials and Methods: Carcinoma cervix patients stage IIB to IIIB (n = 30) treated during November 2011 to May 2013 at the institution with 3D conformal chemo-radiation were included in the study. They received weekly Cisplatin 40 mg/m2 for a maximum of 5 cycles. They received 46 Gy/23 fractions, 5 fractions per week of external beam radiation. In these patients dose optimization was done in order to achieve a tumor maximum dose (Dmax) around 105%. Various techniques were used for dose optimization which included the use of sub fields, adjusting the weightages, using wedges and the use of mixed energies. EBRT (External Beam Radiotherapy) was followed by two fractions of high dose rate intracavitary brachytherapy of 9 Gy each. Acute RTOG toxicity was assessed weekly during EBRT and 1 week post EBRT. Results: The median age of the patients was 45 (range: 30 - 55 years). All the patients completed EBRT;63.3% of the patients received all 5 cycles of chemotherapy while 26.6% of the patients received 4 cycles of chemotherapy and 10% of the patients received 3 cycles of chemotherapy. The most predominant toxicity seen was GI toxicity, diarrhea being the most common GI toxicity followed by vomiting. Neutropenia was the most common hematological toxicity. Most patients had grade 0 and grade 1 toxicity. None of the patients had grade 4 toxicity while few had grade 2 and 3 toxicity. Conclusion: 3D conformal concurrent chemo radiotherapy with Dmaxaround 105% reduces acute RTOG toxicity particularly grade 3 and 4 and improves patient compliance for concurrent chemo-radiotherapy.

关键词： 3D Conformal Dose Optimization Acute Radiation Toxicity

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