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Objective: To evaluate the benefit of radiotherapy planning, involving the use of surgical clips in conservative treatment of earlystage breast cancer. Methods: Retrospective cohort. Twelve (12) breast cancer female patients were retrospectively evaluated. These women had undergone breast-conserving treatment in which the tumor bed had been demarcated with titanium 200 surgical clips to guide breast boost radiotherapy. Volumes were calculated. Radiotherapy planning in the same patient with boost dose guided by metal clips was compared to planning guided by surgical scar or by imaging tests prior to surgical treatment. Results: A reduction of 36.7% in total volume of the irradiated breast (p=0.022), a reduction of 55.7% in boost volume (p=0.001), a reduction of 35.9% (p=0.001) in the breast volume receiving the prescribed boost dose and a reduction of 4.5% (p=0.014) in the maximum dose applied to the lung were shown. Conclusions: Clip placement in surgical bed following conservative treatment for breast cancer determined a reduction of 36.7% in irradiated breast volume and use of a lower dose of irradiation.
Objetivo: Avaliar o benefício do planejamento radioterápico, envolvendo o uso de clipes cirúrgicos em tratamento conservador de estágio inicial de câncer de mama. Métodos: coorte retrospectiva. Doze (12) pacientes do sexo feminino com câncer de mama foram avaliadas retrospectivamente. Estas mulheres foram submetidas a tratamento conservador da mama em que o leito do tumor foi demarcado com grampos cirúrgicos de titânio 200 para orientar a radioterapia de mama. Os volumes foram calculados. O planejamento de radioterapia no mesmo paciente com dose de reforço guiada por clipes metálicos foi comparado ao planejamento guiado por cicatriz cirúrgica ou por exames de imagem antes do tratamento cirúrgico. Resultados: Foram observadas uma redução de 36,7% no volume total da mama irradiada (p = 0,022), uma redução de 55,7% no volume do reforço (p = 0,001), uma redução de 35,9% (p = 0,001) no volume mamário recebendo a dose de reforço prescrita e uma redução de 4,5% (p = 0,014) na dose máxima aplicada ao pulmão. Conclusões: A colocação do clipe no leito cirúrgico após tratamento conservador para câncer de mama determinou uma redução de 36,7% no volume mamário irradiado e o uso de menor dose de irradiação
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Objective To analyze the displacement of titanium clips for tumor bed localization after breast-conserving surgery for breast cancer and its influential factors.Methods A retrospective analysis was performed on the cone-beam computed tomography (CT) images of 14 patients with breast cancer who received radiotherapy after breast-conserving surgery from April to October,2016.The relative position of the chest wall and the errors of the titanium clips in radiotherapy were measured.A Pearson correlation analysis was used to analyze the correlation of the displacement of titanium clips with the relative position of titanium clips,the breast volume,the vertical distance between the titanium clips and the tangential line of the chest wall,and the maximum thickness of the breast.Results The system errors of the chest wall in left-right,superior-inferior,and anterior-posterior directions were 4.42,3.44,and 5.13 mm,respectively,and the random errors were 3.55,3.07,and 4.54 mm,respectively.The titanium clips had a large displacement relative to the chest wall,mainly in the left-right direction.The maximum system error was 4.39 mm and the random error was 2.42 mm.The displacement of titanium clips was not significantly correlated with the breast volume and the maximum thickness of the breast (P>0.05).However,the relative position of titanium clips in superior-inferior direction was significantly correlated with the displacement of the lowest,the most lateral,the most anterior,and the most posterior titanium clips (P<0.05).As to the uppermost clips,there was a significant difference in displacement between the clips close to the chest wall and the clips far from the chest wall (P=0.02).Conclusions Due to large setup error and displacement of titanium clips during radiotherapy,simultaneous integrated boost is not suitable for patients with breast cancer who are immobilized by vacuum cushion and received radiotherapy.The unstable immobilization may be the major influential factor for the displacement of titanium clips.
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Objective To evaluate the dosimetric effects of target volume delineation with metal clip and seroma,alone or in combination,on external-beam partial breast irradiation (EB-PBI) based on four-dimensional computed tomography (4DCT).Methods Twenty female patients undergoing EB-PBI from 2009 to 2013 were enrolled as subjects.The gross tumor volumes (GTVs),GTVC,GTVS,and GTVC+S,were delineated on 4DCT images at 10 phases using metal clip,seroma,and both of them,respectively.The GTVS on 4DCT images at 10 phases were fused to generate the internal gross tumor volumes (IGTVS),IGTVC,IGTVS,and IGTVC+S.The planning target volumes (PTVS),PTVC,PTVS,and PTVC+S,were obtained via expansion of margin by 15 mm.The three-dimensional conformal radiotherapy plans were made by one physician based on PTVC,PTVS,and PTVC+S on end-inhalation images.The target volume,homogeneity index (HI),conformity index (CI),and doses to organs at risk were compared between the three groups.Results The C+S group had the largest IGTV,PTV,and the ratio of PTV to diseased breast volume,which was followed by the C group and the S group (all P＜ 0.05).The S group had significantly lower doses to the ipsilateral normal breast and lung than the C group and the C+S group (all P＜0.05).There were no significant differences in HI or CI between the three groups (all P＞ 0.05).Conclusions The volume variation caused by target volume dehneation on 4DCT images based on different references has little impact on dose distribution in target volume.However,it has substantial impact on radiation doses to the ipsilateral normal breast and lung.
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PURPOSE: To evaluate the movement of surgical clips implanted in breast tumor bed during normal breathing. MATERIALS AND METHODS: Seven patients receiving breast post-operative radiotherapy were selected for this study. Each patient was simulated in a common treatment position. Fluoroscopic images were recorded every 0.033 s, 30 frames per 1 second, for 10 seconds in anterior to posterior (AP), lateral, and tangential direction except one patient's images which were recorded as a rate of 15 frames per second. The movement of surgical clips was recorded and measured, thereby calculated maximal displacement of each clip in AP, lateral, tangential, and superior to inferior (SI) direction. For the comparison, we also measured the movement of diaphragm in SI direction. RESULTS: From AP direction's images, average movement of surgical clips in lateral and SI direction was 0.8+/-0.5 mm and 0.9+/-0.2 mm and maximal movement was 1.9 mm and 1.2 mm. Surgical clips in lateral direction's images were averagely moved 1.3+/-0.7 mm and 1.3+/-0.5 mm in AP and SI direction with 2.6 mm and 2.6 mm maximal movement in each direction. In tangential direction's images, average movement of surgical clips and maximal movement was 1.2+/-0.5 mm and 2.4 mm in tangential direction and 0.9+/-0.4 mm and 1.7 mm in SI direction. Diaphragm was averagely moved 14.0+/-2.4 mm and 18.8 mm maximally in SI direction. CONCLUSION: The movement of clips caused by breathing was not as significant as the movement of diaphragm. And all surgical clip movements were within 3 mm in all directions. These results suggest that for breast radiotherapy, it may not necessary to use breath-holding technique or devices to control breath.
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Humanos , Neoplasias da Mama , Mama , Diafragma , Radioterapia , Respiração , Instrumentos CirúrgicosRESUMO
PURPOSE: To evaluate the role of surgical clips and scars in determining electron boost field for early stage breast cancer undergoing conserving surgery and postoperative radiotherapy and to provide an optimal method in drawing the boost field. MATERIALS AND METHODS: Twenty patients who had 4~7 surgical clips in the excision cavity were selected for this study. The depth informations were obtained to determine electron energy by measuring the distance from the skin to chest wall (SCD) and to the clip implanted in the most posterior area of tumor bed. Three different electron fields were outlined on a simulation film. The radiological tumor bed was determined by connecting all the clips implanted during surgery. Clinical field (CF) was drawn by adding 3 cm margin around surgical scar. Surgical field (SF) was drawn by adding 2 cm margin around surgical clips and an ideal field (IF) was outlined by adding 2 cm margin around both scar and clips. These fields were digitized into our planning system to measure the area of each separate field. The areas of the three different electron boost fields were compared. Finally, surgical clips were contoured on axial CT images and dose volume histogram was plotted to investigate 3-dimensional coverage of the clips. RESULTS: The average depth difference between SCD and the maximal clip location was 0.7+/-0.56 cm. Greater difference of 5 mm or more was seen in 12 patients. The average shift between the borders of scar and clips were 1.7, 1.2, 1.2, and 0.9 cm in superior, inferior, medial, and lateral directions, respectively. The area of the CF was larger than SF and IF in 6/20 patients. In 15/20 patients, the area difference between SF and IF was less than 5%. One to three clips were seen outside the CF in 15/20 patients. In addition, dosimetrically inadequate coverage of clips (less than 80% of prescribed dose) were observed in 17/20 patients when CF was used as the boost field. CONCLUSION: The electron field determined from clinical scar underestimates the tumor bed in superior-inferior direction significantly and thereby underdosing the tissue at risk. The electron field obtained from surgical clips alone dose not cover the entire scar properly. As a consequence, our technique, which combines the surgical clips and clinical scars in determining electron boost field, was proved to be effective in minimizing the geographical miss as well as normal tissue complications.
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Humanos , Neoplasias da Mama , Mama , Cicatriz , Radioterapia , Pele , Instrumentos Cirúrgicos , Parede TorácicaRESUMO
PURPOSE: To evaluate total laryngectomy for the surgical salvage after a unsuccessful chemoradiation therapy treatment for advanced laryngeal squamous cell carcinoma. METHODS: Twelve total laryngectomies were performed from March, 2001 to December, 2002 for recurrence salvage using the linear stapler for pharyngeal closure. The organ preservation protocol for advanced laryngeal cancer consists in weekly cysplatin concomitant to the radiation therapy. The age ranged from 42 to 64 and 11 patients were men. A new clinical stage analysis was performed with telelaryngoscopy, suspension laryngoscopy under general anesthesia and computed tomography. The recurrences should be restricted to the endolarynx. The linear stapler was applied longitudinally in the vallecula between the pharynx and larynx as close as possible to the thyroid cartilage alae. The primary placement of the phonatory prosthesis was performed in 11 patients after the pharyngeal closure. All the patients were discharged from the 4th to the 10th postoperative day and the oral intake was started in the 10th postoperative day. The pharyngeal and esophageal contrasted radiography was performed from the 21th to the30th postoperative day in order to evaluate the pharyngeal pouch. RESULTS: The stapler placement delayed no more than five minutes. There was no report of infection, pharyngocutaneous fistulae, dysphagia complaint and pharyngoesophageal narrowing on the radiographic examination. The phonatory prosthesis was succfully used for the speech rehabilitation. CONCLUSION: The use of the stapler is technically easy to perform and it does not increase the rate of fistulae and dysphagia in patients underwent salvage laryngectomy after radiation therapy. The surgical time is reduced and the primary phonatory rehabilitation with tracheoesophageal prosthesis is feasible.
OBJETIVO: Avaliar a laringectomia total para resgate de recidiva após tratamento por radioterapia e quimioterapia concomitante por carcinoma epidermóide avançado de laringe. MÉTODOS: Entre março de 2001 e dezembro de 2002, foram realizadas 12 laringectomias totais de resgate de recidiva com uso do grampeador linear. O protocolo de preservação de órgão para casos de câncer avançado de laringe consiste no uso de cisplatina semanal concomitante à radioterapia. A idade variou de 42 a 64 anos e onze pacientes eram do sexo masculino. Realizou-se novo estadiamento por telelaringoscopia, laringoscopia de suspensão e tomografia computadorizada. Os tumores recidivados eram restritos à endolaringe. O grampeador linear foi aplicado longitudinalmente na região da valécula, entre a faringe e a laringe, o mais próximo possível da asa da cartilagem tireóidea. A colocação primária de prótese fonatória foi realizada em 11 pacientes após o fechamento da faringe. Todos os pacientes obtiveram alta hospitalar entre o 4º e o 7º dia de pós-operatório e a dieta oral foi iniciada no 10º dia. Realizou-se radiografia contrastada de faringe e esôfago entre o 21º e o 30º dia para avaliar a bolsa faríngea. RESULTADOS: A aplicação do grampeador durou menos que cinco minutos. Não houve infecção, fístula faringo-cutânea, queixa de disfagia nem estreitamento ao estudo radiográfico. Os pacientes obtiveram sucesso na reabilitação fonatória a prótese. CONCLUSÃO: O uso do grampeador é tecnicamente fácil e não aumenta a incidência de fístula ou de disfagia em pacientes submetidos a laringectomia de resgate pós-radioterapia. O tempo cirúrgico é reduzido e não há prejuízo na reabilitação fonatória primária com uso de prótese traqueo-esofágica.