Prospective study to compare the dose distribution and acute toxicity of three-dimentional conformal radiation therapy with intensity-modulated radiation therapy for post-mastectomy radiotherapy in carcinoma breast
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引用次数: 0
Abstract
Though adjuvant radiotherapy has an established role in the treatment of carcinoma breast, there is concern regarding irradiation to heart and lung, more on left sided disease. Intensity Modulated Radiation Therapy (IMRT) modulates the intensity of the radiation beams with better accuracy, sparing surrounding normal organs. But it increases integral dose to normal healthy tissues compared to 3-Dimensional Conformal Radiation Therapy (3DCRT). So, our study was aimed at comparing the dosimetry and acute toxicity profile of 3DCRT and IMRT in post-mastectomy patients. In study arm patients received radiotherapy with IMRT and in control arm with 3DCRT, radiation dose being 50 Gy in 25 fractions for 5 weeks for both the arms. We compared the dosimetric data for Planning Target Volume (PTV) and Organ At-risk (OAR) by both techniques along with acute toxicity profile. Dosimetric parameter of PTV coverage V95 and V107 were significantly better in IMRT than 3DCRT (p-value <0.0001). IMRT showed better homogeneity index (0.14 Gy vs 0.26 Gy) and conformity index was also better for IMRT (0.94 Gy vs 0.74 Gy, p-value 0.0028). The mean value of heart V25 in left sided disease was significantly lower in IMRT than 3DCRT (22.59 and 25.64, p value 0.01). V20 of ipsilateral lung was numerically less in IMRT though not significant (31.44 vs 35.3). But low dose volume was significantly more in IMRT, as seen by higher V5 of heart and ipsilateral lung. To conclude, IMRT has better PTV coverage and better sparing of organs at risk with more homogenous and conformal plans than 3DCRT.
虽然辅助放疗在乳腺癌的治疗中有一定的作用,但对心脏和肺部的放疗,尤其是对左侧疾病的放疗存在担忧。强度调制放射治疗(IMRT)以更好的准确性调节辐射束的强度,不影响周围的正常器官。但与三维适形放射治疗(3DCRT)相比,它增加了对正常健康组织的总剂量。因此,我们的研究旨在比较3DCRT和IMRT对乳房切除术后患者的剂量学和急性毒性。研究组采用IMRT放射治疗,对照组采用3DCRT放射治疗,两组放射剂量均为50 Gy,分25次,持续5周。我们比较了计划靶体积(PTV)和危险器官(OAR)两种技术的剂量学数据以及急性毒性谱。IMRT中PTV覆盖的剂量学参数V95、V107明显优于3DCRT (p值<0.0001)。IMRT表现出更好的均匀性指数(0.14 Gy vs 0.26 Gy)和一致性指数(0.94 Gy vs 0.74 Gy, p值为0.0028)。左侧病变IMRT组心脏V25均值明显低于3DCRT组(22.59、25.64,p值0.01)。同侧肺V20在IMRT中数值较低,但无统计学意义(31.44 vs 35.3)。但在IMRT中,低剂量体积明显增加,表现为心脏和同侧肺V5增高。综上所述,与3DCRT相比,IMRT具有更好的PTV覆盖和更好的保留危险器官的能力,且方案更加均匀和适形。