scholarly journals Does the protocol-required uniform margin around the CTV adequately account for setup inaccuracies in whole breast irradiation?

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Jurui Luo ◽  
Zhihai Yin ◽  
Zhen Zhang ◽  
Xiaomao Guo ◽  
Xiaoli Yu ◽  
...  
Keyword(s):  
Intensity Modulated Radiation Therapy ◽  
Patient Characteristics ◽  
Breast Conserving Surgery ◽  
Target Volume ◽  
Tumor Location ◽  
Patient Specific ◽  
Whole Breast Irradiation ◽  
Breast Irradiation ◽  
Setup Errors ◽  
Pre Treatment

Abstract Purpose To use cone-beam computed tomography (CBCT) imaging to determine the impacts of patient characteristics on the magnitude of geometric setup errors and obtain patient-specific planning target volume (PTV) margins from the correlated patient characteristics in whole breast irradiation (WBI). Methods Between January 2019 and December 2019, a total of 97 patients who underwent breast-conserving surgery, followed by intensity-modulated radiation therapy in WBI, were scanned with pre-treatment CBCT for the first three treatment fractions and weekly for the subsequent fractions. Setup errors in the left–right (LR), superior–inferior (SI) and anterior–posterior (AP) directions were recorded and analyzed with patient characteristics—including age, tumor location, body mass index (BMI), chest circumference (CC) and breast volume (BV)—to examine the predictors for setup errors and obtain specific PTV margins. Results A total of 679 CBCT images from 97 patients were acquired for analysis. The mean setup errors for the whole group were 2.32 ± 1.21 mm, 3.71 ± 2.21 mm and 2.75 ± 1.56 mm in the LR, SI and AP directions, respectively. Patients’ BMI, CC and BV were moderately associated with setup errors, especially in the SI directions (R = 0.40, 0.43 and 0.22, respectively). Setup errors in the SI directions for patients with BMI > 23.8 kg/m2, CC > 89 cm and BV > 657 cm3 were 4.56 ± 2.59 mm, 4.77 ± 2.42 mm and 4.30 ± 2.43 mm, respectively, which were significantly greater than those of patients with BMI ≤ 23.8 kg/m2, CC ≤ 89 cm and BV ≤ 657 cm3 (P < 0.05). Correspondingly, the calculated PTV margins in patients with BMI > 23.8 kg/m2, CC > 89 cm and BV > 657 cm3 were 4.25/7.95/4.93 mm, 4.37/7.66/5.24 mm and 4.22/7.54/5.29 mm in the LR/SI/AP directions, respectively, compared with 3.64/4.64/5.09 mm, 3.31/4.50/4.82 mm and 3.29/5.74/4.73 mm for BMI ≤ 23.8 kg/m2, CC ≤ 89 cm and BV ≤ 657 cm3, respectively. Conclusions The magnitude of geometric setup errors was moderately correlated with BMI, CC and BV. It was recommended to set patient-specific PTV margins according to patient characteristics in the absence of daily image-guided treatment setup.

Dosimetric study of three-dimensional conformal radiotherapy, electronic compensator technique, intensity-modulated radiation therapy and volumetric-modulated arc therapy in whole breast irradiation

2017 ◽  
Vol 16 (4) ◽  
pp. 431-443 ◽  
Author(s):  
Chonnipa Nantavithya ◽  
Kitwadee Saksornchai ◽  
Puntiwa Oonsiri ◽  
Kanjana Shotelersuk
Keyword(s):  
Radiation Therapy ◽  
Volumetric Modulated Arc Therapy ◽  
Three Dimensional ◽  
Intensity Modulated Radiation Therapy ◽  
Conformal Radiotherapy ◽  
Target Volume ◽  
Whole Breast Irradiation ◽  
Breast Irradiation ◽  
Lung Dose ◽  
3D Crt

AbstractBackgroundWhole breast irradiation is an essential treatment after breast-conserving surgery (BCS). However, there are some adverse effects from inhomogeneity and dose to adjacent normal tissues.ObjectiveAim of this study was to compare dosimetry among standard technique, three-dimensional conformal radiotherapy (3D-CRT), and advanced techniques, electronic compensator (ECOMP), inverse intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT).MethodsWhole breast irradiation treatment plans of patients who had underwent BCS and whole breast irradiation were re-planned with all four techniques. Clinical target volume was contoured according to the Radiation Therapy Oncology Group atlas for breast only in patients who had negative node or ductal carcinoma in situ and breast with chest wall for patients with positive node. Planning target volume was non-uniformly expanded. Dose prescription was 50 Gy in 25 fractions with 6 MV photon energy.ResultsIn total, 25 patients underwent whole breast irradiation with computed tomography simulation from November 2013 to November 2014 were included. Six patients with positive nodes were re-planned for breast with chest wall irradiation and 19 patients with negative nodes were re-planned for breast only irradiation. Primary outcome, radical dose homogeneity index (HI) of 3D-CRT, ECOMP, IMRT and VMAT were 0·865, 0·889, 0·890 and 0·866, respectively. ECOMP and IMRT showed significant higher HI than 3D-CRT (p-value<0·001). Secondary outcome, conformity index (CI) of advanced technique were significantly better than 3D-CRT. Lung V20, mean ipsilateral lung dose (MILD), mean heart dose (MHD), heart V25, heart V30 of advanced techniques were also lower than 3D-CRT. ECOMP had better mean lung dose (MLD), mean contralateral lung dose (MCLD) and mean contralateral breast dose (MCBD) when compared with 3D-CRT. Monitor units of advanced techniques were significantly higher than 3D-CRT.ConclusionsHI of ECOMP and IMRT were significantly higher than 3D-CRT technique. All advanced techniques showed statistically better in CI. Lung V20, MILD, heart V25 and heart V30 of advanced techniques were lower than 3D-CRT. However, only ECOMP showed decreased MLD, MHD, MCLD and MCBD when compared with 3D-CRT.

Five-day accelerated partial breast irradiation (APBI) using intensity modulated radiation therapy (IMRT) in stage 0-II breast cancer: A report of 214 cases with up to 39 month follow-up.

2021 ◽  
Vol 39 (15_suppl) ◽  
pp. e12508-e12508
Author(s):  
Rufus J. Mark ◽  
Valerie Gorman ◽  
Michal Wolski ◽  
Steven McCullough
Keyword(s):  
Breast Cancer ◽  
Intensity Modulated Radiation Therapy ◽  
Target Volume ◽  
Accelerated Partial Breast Irradiation ◽  
Partial Breast Irradiation ◽  
Breast Irradiation ◽  
Skin Reactions ◽  
Cosmetic Results ◽  
Non Invasive

e12508 Background: Randomized trials in stage 0-II breast cancer have proven that APBI given via HDR implant in 5 days is equivalent to whole breast irradiation (WBI) given in 5-6 weeks in regard to breast tumor local recurrence (LR). However, complications have been significant. Recently APBI using non-invasive IMRT given in 5 fractions has been shown in another randomized trial with 10 year follow-up to be equivalent to WBI in 6 weeks, with respect to LR. IMRT was superior in regard to acute effects, late effects, and cosmesis. In the randomized clinical trial of APBI IMRT, the Clinical Target Volume (CTV) was defined by the injection of individual fiducial markers bordering the surgical cavity. We have used the Biozorb fiducial system to localize the CTV for IMRT. We sought to confirm the APBI IMRT results with this simpler less labor intensive fiducial placement system. Methods: Between 2017 and 2021, 214 patients have undergone IMRT targeted to a Biozorb defined CTV with the walls of the surgical cavity sewn to the Biozorb device. Eligible patients were older than age 40, had tumor sizes < 3 cm, negative surgical margins, and negative sentinel node dissections. IMRT dose was 30 Gy given in 5 fractions. Dose Constraints were as follows : V-30 Gy < 105%, Ipsilateral Breast V-15 Gy < 50%, Ipsilateral Lung V-10 Gy < 20%, Contralateral Lung V-5 Gy < 10%, Heart V-3 Gy < 20%, Contralateral Breast Dmax < 2 Gy and Skin Dmax < 27 Gy. The Planning Target Volume (PTV) ranged from 27 to 355 cc with a median of 80 cc. PTV = CTV + 1-2 cm. Results: Follow-up ranged from 1-39 months with a median of 20 months. LR has been 0% (0/214). There have been no skin reactions or seromas. Infection has occurred in one patient (0.5%). Four (1.9%) patients developed pain around the Biozorb site. This resolved on a short courses of steroids in all cases. Cosmetic results as rated by the Surgeon, Radiation Oncologist, and Nurse, were rated excellent in 99.0% (212/214) of cases. Conclusions: Non-invasive APBI with IMRT given qd over 5 days targeted to Biozorb has resulted in LR, complications, and cosmetic results which compare favorably to invasive APBI given bid with HDR implant. At last follow-up, there have been no LR, skin reactions, or significant complications. Cosmesis has been excellent in 99.0% of patients.

scholarly journals Impact of Respiratory Motion on Point Doses for Three Whole-breast Irradiation Techniques after Breast-conserving Surgery

2021 ◽  
Vol 77 (9) ◽  
pp. 959-967
Author(s):  
Keisuke Okumura ◽  
Tsukasa Wakayama ◽  
Taishi Matsuda ◽  
Kenji Matsumoto ◽  
Naritoshi Mukumoto ◽  
...  
Keyword(s):  
Respiratory Motion ◽  
Breast Conserving Surgery ◽  
Whole Breast Irradiation ◽  
Breast Irradiation

scholarly journals Risk factors for radiation pneumonitis caused by whole breast irradiation following breast-conserving surgery

2009 ◽  
Vol 56 (3,4) ◽  
pp. 99-110 ◽  
Author(s):  
Akiko Kubo ◽  
Kyosuke Osaki ◽  
Takashi Kawanaka ◽  
Shunsuke Furutani ◽  
Hitoshi Ikushima ◽  
...  
Keyword(s):  
Risk Factors ◽  
Radiation Pneumonitis ◽  
Breast Conserving Surgery ◽  
Whole Breast Irradiation ◽  
Breast Irradiation

scholarly journals Accelerated Partial Breast Irradiation as an Alternative to Whole-Breast Irradiation in Breast-Conserving Therapy for Early-Stage Breast Cancer

2005 ◽  
Vol 1 (1) ◽  
pp. 59-71
Author(s):  
Timothy M Pawlik ◽  
Henry M Kuerer
Keyword(s):  
Breast Cancer ◽  
Early Stage ◽  
Local Therapy ◽  
Breast Conserving Surgery ◽  
Breast Conserving Therapy ◽  
Early Stage Breast Cancer ◽  
Accelerated Partial Breast Irradiation ◽  
Partial Breast Irradiation ◽  
Whole Breast Irradiation ◽  
Breast Irradiation

Breast-conserving therapy has been established as a standard treatment for women with early-stage breast cancer. Whole-breast irradiation has traditionally been utilized to consolidate local therapy following conservative surgery. Recently, the need for whole-breast irradiation after breast-conserving surgery has become controversial, with some investigators advocating accelerated partial breast irradiation as an alternative. Accelerated partial breast irradiation is delivered over a shorter period and only to a portion of the breast. This review will examine the emerging role of accelerated partial breast irradiation in the treatment of early-stage breast cancer and review the biologic rationale for, techniques of, and limitations of partial breast irradiation following breast-conserving surgery.

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