Comparison of the Cosmetic Outcome of Hypofractionated Versus Normofractionated IMRT in Treatment of Breast Cancer

Study Overview
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Brief Summary
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Several multicenter studies have shown the equivalence of hypofractionated radiotherapy and normofractionated radiotherapy after breast-conserving surgery. However, the treatment in these studies was carried out with conventional techniques and not with the modern IMRT. Also the evaluation of quality of life and cosmetic outcome were not standardized. This study is a two-arm prospective study comparing normofractionated and hypofractionated radiotherapy in patients with breast cancer using tangential IMRT techniques. The primary endpoints are acute and chronic cosmetic breast changes. The secondary endpoint is the patients' quality of life. Patients to be included are breast cancer 60 years old patients or older with tumour stages pTis-pT3, pN0-pN1a, M0 after breast-conserving surgery. Patients with right sided breast cancer are stratified to receive a hypofractionated treatment course (40.05 / 2.67Gy in 15 fractions) and the left sided breast cancer a normofractionated irradiation (50/2Gy in 25 fractions). In both arms, patients between 60-69 years are to receive a boost (16 Gy / 2Gy). In both groups, a tangential intensity-modulated radiation technique aiming to achieve optimal dose homogeneity is applied. Since higher single radiation dose to the heart can lead to higher morbidity and/or mortality, patient stratification according to the diseased side was adopted where the left-sided breast cancer patients would receive normofractionated 2Gy single dose. Therefore there is no randomization. For classification and grading of adverse cosmetic events, the Common Toxicity Criteria (CTC-AE V3.0) and the recognized LENT-SOMA scores are to be regularly documented. Quality of life is to be documented with two standardized, validated questionnaires QLQ C30 and BR23 of the EORTC (European Organization for Research and Treatment of Cancer). The questionnaires are to be filled by the patients themselves at different time points during the study period. A sum of grade III fibrosis, grade III telangiectasia and grade II hyperpigmentation of around 20% is expected after 2 years. Therefore, calculation of the required number of cases based on an alpha of 0.05 and a power of 80% with a maximal tolerable toxicity difference of 15% within 2 years results in the need for recruiting 226 patients (113 in each arm) (non-inferiority of hypofractionated therapy).

Official Title
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Comparison of the Cosmetic Outcome of Hypofractionated Versus Normofractionated Intensity Modulated Radiotherapy (IMRT) in Treatment of Breast Cancer: The KOSIMA Trial

Conditions
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Tumors, Breast Cancer

Intervention / Treatment
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* Radiation: intensity modulated radiotherapy (IMRT) for breast cancer


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Histologically confirmed invasive or in situ breast cancer, tumor stage pTis-pT3, pN0-1a, M0 Age ≥ 60 years signed informed consent from the patient Exclusion Criteria: Stage pN1b-PN3, pT4 and / or M1 incomplete surgical resection after mastectomy of the ipsilateral or contralateral breast breast reconstruction with implant or expander insert bilateral breast cancer Lack of compliance or consent Indications for irradiation of the axillary, supraclavicular or parasternal lymph nodes

Ages Eligible for Study
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Minimum Age: 60 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: 1-Hypofractionated IMRT<br>hypofractionated IMRT for right sided breast cancer | Radiation: intensity modulated radiotherapy (IMRT) for breast cancer<br>* right sided breast cancer patients are stratified to receive a hypofractionated treatment course (40.05 / 2.67Gy in 15 fractions) and the left sided breast cancer patients a normofractionated irradiation (50/2Gy in 25 fractions). In both arms, patients between 60-69 years are to receive a boost (16 Gy / 2Gy).<br>* Other names: Arm 1, Arm 2;|
| Active Comparator: 2-Normofractioated IMRT<br>normofractionated IMRT for left sided breast cancer | Radiation: intensity modulated radiotherapy (IMRT) for breast cancer<br>* right sided breast cancer patients are stratified to receive a hypofractionated treatment course (40.05 / 2.67Gy in 15 fractions) and the left sided breast cancer patients a normofractionated irradiation (50/2Gy in 25 fractions). In both arms, patients between 60-69 years are to receive a boost (16 Gy / 2Gy).<br>* Other names: Arm 1, Arm 2;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| acute and chronic cosmetic outcome |  | 2 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| acute and chronic cosmetic outcome, Quality of life |  | 2 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Intensity-Modulated Radiation Therapy (IMRT), Breast cancer, Hypofractionation