This study is to evaluate the effect of a Contrast Media (CM) on dose calculations and clinical significance in Radiation (Electromagnetic wave) Therapy (RT) plans for head & neck (H&N) and prostate cancer. Pinnacle 8.0 system was used to measure the change of Electron Density (ED) of the tissue for CM. To determine the effect of dose calculation due to CM, we did the RT planning for 30 patients. To compare the ED and dose calculations of RT plans, 3D CRT and IMRT plans were do with pinnacle and Tomotherapy planning system. Mean difference of ED between enhanced and unenhanced CT was less than 4%: H&N Target Volume (TV) 2.1%, parotid 1.9%, SMG 3.6%, tongue 0.9%, spinal cord 0.3%, esophagus 2.6%, mandible 0.1% and prostate TV 0.7%, lymph node 1.1%, bladder 1.2%, rectum 1.5%, small bowel 1.2%, colon 0.6%, penile bulb 0.8%, femoral head -0.2%. The dose difference between RT plan using CM and without CM showed an increase of dose in TV. The rate of increase was less than 2.5% (3D CRT: H&N 0.69~2.51%, prostate 0.04~1.14%, IMRT: H&N 0.58~1.31%, prostate 0.36~1.04%). RT plans using a CM has the insignificant effect on the organs and TV, so this error is allowable clinically. However, the much more accurate plan is possible as to image fusion (CM and without CM images) to ROI contour and when dose calculation, use the without CM image. Using the fusion of 'ROI import' perform calculations on without CM, it will be able to reduce the error (1~3%) caused by the CM.
The pencil beam convolution (PBC) algorithms in radiation treatment planning system have been widely used to calculate the radiation dose. A new photon dose calculation algorithm, referred to as the anisotropic analytical algorithm (AAA), was released for use by the Varian medical system. The aim of this paper was to investigate the difference in dose calculation between the AAA and PBC algorithm using the intensity modulated radiation therapy (IMRT) plan for lung cancer cases that were inhomogeneous in the low density. We quantitatively analyzed the differences in dose using the eclipse planning system (Varian Medical System, Palo Alto, CA) and I'mRT matirxx (IBA, Schwarzenbruck, Germany) equipment to compare the gamma evaluation. 11 patients with lung cancer at various sites were used in this study. We also used the TLD-100 (LiF) to measure the differences in dose between the calculated dose and measured dose in the Alderson Rando phantom. The maximum, mean, minimum dose for the normal tissue did not change significantly. But the volume of the PTV covered by the 95% isodose curve was decreased by 6% in the lung due to the difference in the algorithms. The difference dose between the calculated dose by the PBC algorithms and AAA algorithms and the measured dose with TLD-100 (LiF) in the Alderson Rando phantom was -4.6% and -2.7% respectively. Based on the results of this study, the treatment plan calculated using the AAA algorithms is more accurate in lung sites with a low density when compared to the treatment plan calculated using the PBC algorithms.
Non-small cell lung cancer (NSCLC) with invasion of mediastinal structures is classified as stage IIIB, and has been considered surgically unresectable However, in a selected group of these patients, better results after surgical resection compared to non-surgical group have been reported. The aim of this study is to evaluate the role of surgical resection in treatment of mediastinal T4 NSCLC. Material and Method: Among 1067 patients who underwent surgical intervention for non-small cell lung cancer from Aug 1987 to Dec 2001 in Korea cancer center hospital, 82 patients had an invasion of T4 mediastinal structures (7.7%). Resection was possible in 63patients (63/82 resectability 76.8%). Their medical records in Data Base were reviewed, and they were followed up completely until Jun 2002. Surgical results and prognostic factors of NSCLC invading mediastinal structures were evaluated retrospectively. Result Lung cancer was resected completely in 52 patients (63.4%, 52/82). Lung resection was lobectomy (or more) in 14, pneumonectomy in 49. The mediastinal structures invaded by primary tumor were great vessel (61.9%), heart (19%), vagus nerve (9.5%), esophagus (7.9%), and vertebral body (7.9%). Nodal status was N0 in 11, N1 in 24, and N2 in 28 (44.4%). Neoadjuvant therapy was done in 6 (9.5%, 5 chemotherapy, 1 radiotherapy), and adjuvant therapy was added in 44 (69.8%, 15 chemotherapy, 29 radiotherapy) in resection group (n=63). Complication was occurred in 23 (31.7%), and operative mortality was 9.5% in resection group. Median and 5 year overall survival including operative mortality was 18.1 months and 21.7% in resection group (n=63), 6.2months and 0% in exploration only group (n=19, p=.001), 39 months and 32.9% in N2 (-) resection group (n=35), and 8.8 months and 8.6% in N2 (+) resection group (n=28, p=.007). The difference of overall survival by mediastinal structure was not significant. Conclusion: The operative risk of NSCLC invading mediastinal structures was high but acceptable, and long-term result of resection was favorable in selected group. Aggressive resection is recommended in well selected pateints with good performace and especially N2 (-) NSCLC with mediastinal invasion.
Yoon, Ho Young;Kim, Hyoung-Il;Lee, Sang Hoon;Kim, Choong Bai
Journal of Gastric Cancer
/
v.8
no.2
/
pp.97-103
/
2008
Purpose: Radical surgery is the standard therapy for patients with resectable cardia cancer. In the case of type II disease with esophageal invasion, a transhiatal extended radical total gastrectomy is needed or a gastroesophagectomy through an abdomino-thoracotomy, depending on the extent of the esophageal invasion. We analyzed the indications and outcome of left colon interposition as an esophageal substitution. Materials and Methods: Between 1 January 1994 and 31 December 2006, 10 patients underwent left colon interposition after gastroesophagectomy through an abdomino-thoracotomy or the tanshiatal approach for type II cardia cancer at the Department of surgery, Yonsei University College of Medicine. The outcomes of these patients were reviewed and compared, with those who underwent a Roux-en-Y, by gender and age matched analysis, retrospectively. Results: There were nine males and one female with a mean age of 52.5 (range, 16~72). The operation time was $449.00{\pm}87.39minutes$. The mean distance between the proximal resection margin and the cancer was $6.56{\pm}3.65cm$; the maximum size of the tumor was $9.90{\pm}3.97cm$. These measures differed significantly from patients who underwent Roux-en-Y. The patients had a double primary cancer in the cardia and esophagus. There were no events of colon necrosis. However, a pneumothorax occurred in one patient (10%) and a proximal anastomotic stricture occurred in one patient. There were no reports of heartburn, regurgitation, thoracic or epigastric fullness, and one patient even gained weight, 16 kg. Conclusion: Colon interposition after esophagogastrectomy was safe and effective and should be considered as an additional surgical option for locally advanced type II cardia cancer patients with esophageal invasion.
Kim, Cheol-Min;Song, Jun-Young;Kim, Ja Hyung;Kim, Ki Soo;Hong, Soo-Jong
Clinical and Experimental Pediatrics
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v.45
no.9
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pp.1134-1140
/
2002
Purpose : Childhood accidents have been increasing recently. Accidents rank as the leading cause of childhood mortality and morbidity. We performed this study to evaluate the causes of childhood accidents. Methods : The authors analysed retrospectively the medical records of 6,410 cases of childhood accidental injuries who visited the emergency room of Asan Medical Center from January 1990 to December 1999. Results : The most common type of accidents was trauma which accounted for 5,038 cases of the total accidents, followed by falls, burns, foreign body aspiration, and poisoning. The most common age of foreign body aspiration was under two years old and the male to female ratio was 2 to 1. The most common site of foreign body aspiration was the esophagus and the stomach, followed by the respiratory tract. In airways, the right and left main bronchus were the most common site for foreign body aspiration and were accompanied by the highest mortality. The most common foreign body in the gastrointestinal tract and respiratory tract were coins and peanuts, respectively. Conclusion : The most common cause of accidents was trauma, followed by falls, burns, foreign body aspiration, and poisoning. The incidence of foreign body aspiration and poisoning is increasing in infants. In cases of foreign bodies in airways, proper management is needed because of the high mortality rate.
Purpose: Ingested foreign bodies are removed by endoscopy, surgery or spontaneous passage, however, the decision of therapeutic modality chosen depends on the type, size, shape and location of the ingested foreign bodies. Therefore, this study was conducted to investigate the rate and characteristics of foreign bodies that were passed spontaneously out of the intestine. Methods: One hundred and sixty patients who visited Samsung Medical Center for treatment of gastrointestinal foreign bodies between January 2001 to July 2007 were enrolled in this study. Related data was colleted by reviewing the medical records of patients with proven foreign bodies retrospectively, as well as by conducting phone interviews with the parents of the patients. All cases were classified based on the nature and location of the ingested foreign body, as well as whether it was treated by spontaneous passage. Results: Of the 160 cases involving the passage of foreign bodies in children were included in this study (95 boys and 65 girls), endoscopic removals, operative removals or spontaneous passages were conducted in 80, 3 and 77 patients, respectively. The spontaneous passage rates for each type of object were as follows; coins (36.5%), bead and baduk stones (83.3%), long and sharp materials (52.6%), magnets (69.2%) and disc batteries (50.0%). In cases involving round-shaped foreign bodies, such as coins, the diverse spontaneous passage rates were more diverse. When foreign bodies were stuck below esophagus, similar sized coins and baduk stones had spontaneous passage rates greater than 80% regardless of age. Conclusion: It is better for clinicians to wait for spontaneous passage to occur in cases involving coins or round-shaped foreign bodies that are located at or below the stomach.
Purpose: The aim of this study was to determine how much acid exposure would occur in the proximal esophagus, both in normal and in patients with abnormal distal esophageal acid exposure. Methods: Fourty-six patients with suspected GER were classified into two groups, 24 patients with pathological distal reflux (group I); 22 patients with normal distal reflux (group II). The ambulatory dual-probe esophageal pH monitoring was performed for 18-24hr. The abnormal reflux was defined when the percent of time that pH was below 4.0 exceeded the 95th percentile of normal value. Results: The siginficant differences between distal and proximal esophageal pH recordings in group I persisted for all parameters except for the longest episode, but didn't persist in group II. At the distal esophageal site, the median percent time with pH<4.0 in group I was 19.3 and significantly higher than at proximal site. Half of patients with pathological distal reflux also had proximal acid reflux. Correlation coefficients between the distal and proximal esophageal sites in group I of the number of reflux episodes and time of the longest episode were 0.451 and 0.646 respectively. Conclusion: The 50 percent of patients with pathological distal acid reflux also had abnormal acid exposure in the proximal esophageal site. Therefore, we recommand simultaneous pH recordings from dual probe esophageal sites in children with gastroesophageal reflux.
Kim, Kyung Chan;Seo, Chang Gyun;Park, Sun Hyo;Choi, Won-Il;Han, Seung Beom;Jeon, Young June;Park, Jong-Wook;Jeon, Chang-Ho
Tuberculosis and Respiratory Diseases
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v.56
no.2
/
pp.159-168
/
2004
Background : In recent years, numerous human tumor specific antigens such as melanoma antigen gene(MAGE) that is recognized by autologous cytotoxic T lymphocytes have been identified. MAGE is expressed in many human malignancies in various organs, such as lung, breast, stomach, esophagus and leukemia. Therefore MAGE has been studied widely for tumor diagnosis and immunotherapy. But, so far there were no clinical studies evaluating the role of MAGE in pleural effusion. We investigated the expression of MAGE in the patients with exudative pleural effusion for it's diagnostic utility and the results were compared with those of cytologic examinations. Methods : Diagnostic thoracentesis was performed in 44 consecutive patients with exudative pleural effusion during 6 months. We examined the expression of MAGE and cytology with the obtained pleural effusion. Expression of MAGE was interpreted by means of a commercial kit using RT-PCR method. Enrolled patients were divided into two groups such as malignant and benign and we analyzed its' sensitivity and specificity. Results : There were no significant differences between two groups in age, sex, white blood cell counts in pleural fluid, pleural fluid/serum protein ratio and pleural fluid/serum LDH ratio. The sensitivity and specificity of MAGE were 72.2% and 96.2% respectively and the positive predictive value and negative predictive value of MAGE were also 92.9% and 83.3% respectively. The sensitivity and negative predictive value of cytologic examinations were 66.7% and 81.3% respectively. There were no significant differences between sensitivities of MAGE and cytologic examinations but false positive result of MAGE was found in 1 case of tuberculous pleurisy. Conclusion : MAGE is a sensitive and specific marker for the differential diagnosis between benign and malignant effusion in patients with exudative pleural effusion. And MAGE would provide the equal sensitivity compared with that of cytologic examination in patients with malignant pleural effusion if 5mL of the pleural fluid is examined.
The purpose of this study was to evacuate the effect of different types of Poly(lactic-co-glycolic acid) (PLGA) scaffolds on the formation of human auricular and septal cartilages. All of the scaffolds were formed in a tubular shape for potential application for artificial trachea or esophagus with either 110,000 g/mol PLGA. 220,000 g/mol PLGA. or a combination of both. In order to maintain the tubular shape in vivo, two methods were used. One method was inserting polyethylene tube at the center of scaffolds made of 110,000 g/mol PLGA. The other method involved combination of the two different molecular weight PLGA's. The inner surface of tubular shaped scaffold made with 110,000 g/mol PLGA was coated with 220,000 9/mol PLGA to give more mechanical rigidity. Elastic cartilage was taken from the ear of a patient aged under 20 nears old and hyaline cartilage was taken from the nasal septum. The chondrocytes were then isolated. After second passage, the chondrocytes were seeded on the PLGA scaffolds followed by in vitro culture for one week. The cells-PLGA scaffold complex were implanted subcutaneously on the back of nude mice for 8 weeks. The tissue engineered cartilages were separated from nude mice and examined histologically after staining with the Hematoxylin Eosin. The morphology of the scaffolds were examined by scanning electron microscopy. The pores were well formed and uniformly distributed in the various PLGA scaffolds. After 8 weeks in vivo culture, cartilage was well formed with 110,000 g/mol PLGA. however lumen had collapsed. In contrast. a minimal amount of neocartilage was formed with 220,000 g/mol PLGA, while the architecture of scaffold and lumen were well preserved. Elastic cartilage formed more neocartilage than hyaline. Hyaline and elastic neocartilage were well formed on 110,000 g/mol PLGA with the polyethylene tube, exhibiting mature chondrocytes and preservation of the tubular shape. It was found that 110,000 g/mol PLGA was more appropriate for cartilage formation but higher molecular weight polymer was necessary to maintain the three dimensional shape of the scaffold.
Purpose :We peformed the retrospective analysis to find the outcome of external beam radiotherapy alone in advanced esophageal cancer patients. Methods and Materials : One hundred and six Patients treated with external beam radiotherapy alone between July 1990 and December 1996 were analyzed retrospectively. We limited the site of the lesions to the thoracic esophagus and cell type to the squamous cell carcinoma. Follow-up was completed in 100 patients (94$\%$) and ranged from 1 month to 92 months (median; 6 months). Results :The median age was 62 years old and male to female ratio was 104 2. Fifty-three percent was the middle thorax lesion and curative radiotherapy was peformed in 83$\%$. Mean tumor dose delivered with curative aim was 58.6 Gy (55$\~$70.8 Gy) and median duration of the radiation therapy was 53 days. The median survival of all patients was 6 months and )-year and 2-year overall survival rate was 27$\%$ and 12$\%$, respectively, Improvement of dysphagia was obtained in most patients except for 7 patients who underwent feeding gastrostomy. The complete response rate immediately after radiation therapy was 32$\%$ (34/106). The median survival and 2-year survival rate of the complete responder was 14 months and 30$\%$ respectively, while those of the nonresponder was 4 months and 0$\%$ respectively (p=0.000). The median survival and 2-year survival rate of the patients who could tolerate regular diet was 9 months and 16$\%$ while those of the patients who could not tolerate regular diet was 3 months and 0$\%$, respectively (p=0.004). The survival difference between the patients with S cm or less tumor length and those with more than 5 cm tumor length was marginally statistically significant (u=0,06). However, the survival difference according to the periesophageal invasion or mediastinal tyrnphadenopathy in the chest CT imaging study was not statistically significant in this study. In a multivariate analysis, the statistically significant covariates to the survival were complete response to radiotherapy, tumor length, and initial degree of dysphagia in a decreasing order. The complication was observed in 10 patients (9$\%$). Conclusion :The survival outcome for advanced esophageal cancer patients treated by external beam radiotherapy alone was very poor. In the treatment of these patients, the brachytherapy and chemotherapy should be added to improve the treatment outcome.
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