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Objective To preliminarily evaluate the efficacy and safety of intensity-modulated radiotherapy (IMRT) in the treatment of inoperable stage ⅣA thymoma.Methods A retrospective analysis of 15 patients with inoperable stage ⅣA thymoma receiving IMRT from January 2010 to December 2017 was performed.Among them,9 patients were male and 6 female,aged 31-83 years with a medianof 59 years.The dose of radiotherapy was 50 Gy/60 Gy/70 Gy/ 15-20 fractions for PTV/CTV/GTV.The short-term efficacy,overall survival rate and adverse reactions were analyzed.Results The follow-up rate was 100％.The median follow-up time was 48 months.The short-term partial remission rate was 93％(14/15).The 1-,3-and 5-year overall survival rates were 100％,75％ and 75％,respectively.One patient presented with grade 3 hematological reaction.Four patients died of tumors.Conclusion Preliminary findings demonstrate that IMRT is an efficacious and safe treatment of stage ⅣA thymoma,which can be applied for patients with unresectable thymoma.
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Objective To retrospectively analyze the clinical outcome of radiotherapy for unresectable renal cell carcinoma and renal pelvis and ureter cancer. Methods A total of 29 patients with unresectable renal cell carcinoma or renal pelvis and ureter cancer received radiotherapy from 2006 to 2015. Those patients were 18 males and 11 females aged between 41 and 95 years(median age 76 years). In those patients,17 had renal cell carcinoma and 12 renal pelvis and ureter cancer;14 had hematuria and 7 low back pain. All patients received dose-escalation radiotherapy,with 17 treated by gamma knife treatment and 12 by helical tomotherapy(HT). For the gamma knife treatment, the 50% isodose line was set as the prescribed dose line;the radiation dose was 3 to 5 Gy per fraction, with a total dose of 40-50 Gy around the planning target volume and 60-70 Gy around the gross tumor volume. HT was performed with a dose of 50/60/70 Gy in 15-20 fractions. Results For the primary lesion, the complete response(CR)and partial response (PR)rates were 17%(5/29)and 69%(20/29),respectively,yielding an overall response rate(CR+PR) of 86%. After treatment,93% of patients recovered from hematuria and 100% of patients recovered from low back pain. The 3-and 5-year sample sizes were 15 and 11, respectively. The 3-, and 5-year survival rates were 81%,and 81%,respectively,for renal cell carcinoma,and,69%,and 69%,respectively,for renal pelvis and ureter cancer. During treatment, 25 patients had grade 1-2 digestive system reaction and 20 patients had grade 1-2 bone marrow suppression. The radiation-induced toxicity was reduced by medication. Conclusions Radiotherapy is safe and effective for treating renal cell carcinoma and renal pelvis and ureter cancer. It can improve the local control and overall survival rates. Radiotherapy provides an effective way to treat unresectable renal cell carcinoma and renal pelvis and ureter carcinoma.
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Objective To introduce the therapeutic procedures of helical tomotherapy based total marrow irradiation(HT-TMI), and validate the feasibility of TMI. Methods At 1 week before bone marrow transplantation,12 patients received TMI conditioning regimen at a prescriptive dose of 12 Gy in 3 times,once daily. Patient immobilization, CT simulation, target delineation, plan design and dosimetric verification were implemented in sequence according to the TMI procedures. The dosimetric paramaters of the target and normal tissues were analysed. The correlation between the dose verification and image-guided results was observed. Results Compared with total body irradiation(TBI), TMI could significantly reduce the irradiation dose to normal tissues. The median dose D50of all normal tissues except the oral cavity were lower than 6 Gy,where The D50of lens,brain,lung and liver are (1.8±0.1) Gy, (5.7±0.2) Gy, (5.2±0.2) Gy, and (4.6±0.2) Gy, respectively. Pass rate of γ Index was larger than 95% with 3mm/3% criterian for each section. The positioning error of head and neck was relatively lower than that of pelvis at x-axis,and was higher at z-axis.Conclusions Helical tomotherapy based TMI is a feasible and reasonable approach,which has evident dosimetric advantage.
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Objective To explore the efficacy and security of helical tomotherapy (radical radiotherapy) combined with targeted therapy for stage Ⅳ non-small cell lung cancer (NSCLC).Methods The data of 19 patients with stage Ⅳ NSCLC were retrospectively analyzed.The efficacy and security were observed by SPSS 20.0 statistical software.Results Among 19 patients, there were 6 cases complete remission (CR), 8 cases partial remission (PR), 4 cases stable disease (SD), 2 cases progressive disease (PD).The response (CR+PR) rate was 73.7 ％ (14/19).The 1-and 2-year local control rates were 73.7 ％, 47.4 ％,respectively.The 1-year progression-free survival rate was 31.6 ％.The median survival time was 13 months, and the 1-and 2-year overall survival rates were 52.6 ％, 26.3 ％, respectively.The median survival time of females, non-smokers or targeted therapy synchronous radiotherapy was longer than that of male, smokers or targeted therapy sequential radiotherapy, respectively (21 months vs 8 months, P =0.014;21 months vs 6 months, P =0.007;18 months vs 6 months, P =0.026).There were no significant differences of age, number of metastatical organs or targeted drug categories between two groups (P ＞ 0.05).All patients could tolerate the adverse reactions without treatment-related death.Conclusion The effect of helical tomotherapy combined with targeted therapy for stage Ⅳ NSCLC is desirable.
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Objective To compare the tumor sizes of primary lesions in pancreatic cancer based on CT scan and postoperative pathological analysis and measure the extent of filtration under a microscope,and to determine the CTV in radiotherapy target delineation.Methods A total of 19 patients with pancreatic cancer who were admitted to PLA General Hospital and Air Force General Hospital,PLA from 2013 to 2014 were analyzed.In 15 patients,the maximum diameters of tumor cross-section were measured based on the images of preoperative multi-slice spiral CT and postoperative gross samples,respectively.In 19 patients,the extent of tumor infiltration was measured on pathological sections under a microscope and the actual extent of infiltration was calculated.The paired t-test was applied to analyze the differences in the results of different measurement methods.Results In the 15 patients,the maximum tumor diameters measured with gross samples and CT scan were 33.6 mm and 30.1 mm,respectively (P=0.000),and the median and mean of the differences were 3.1 mm (1.2-8.0 mm) and 3.6±2.0 mm,respectively (95％ CI 1.2-6.0).In the 19 patients,the maximum actual infiltration distance and the maximum distance measured were 3.50 mm and 3.19 mm,respectively (P=0.000),and the median and mean of the differences were 0.31 mm (0.15-0.50 mm) and 0.30±0.09 mm,respectively.The maximum distance between the margin of primary lesions and the infiltrating lesions was 5.21 mm,with a median of 3.34 mm (2.19-5.21 mm) and a mean of 3.50± 0.88 mm (95％ CI 2.19-5.06).Conclusions Contrast-enhanced CT scan underestimates the actual size of primary lesions in pancreatic cancer,and an extension of 5 mm outside gross tumor volume (GTV) as CTV may not be sufficient.It is recommended to extend another 1-3 mm outside GTV as CTV.
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Objective To preliminarily evaluate the feasibility,therapeutic effect and normal tissue complications of stereotactic γ-ray body radiation therapy for patients with asynchronous bilateral renal cell carcinoma.Methods Nine patients with inoperable asynchronous bilateral renal cell carcinoma with a median time from the resection of the primary focus and discovery of the contralateral focus underwent stereotactic γ-ray body radiotherapy with OUR-QGD stereotactic γ-ray whole body therapeutic planning system.50％ isodose line,as the prescription dose line,was to cover the planning target volume (PTV) and the 70％ isodose line was to cover the gross target volume (GTV).Radiotherapy was delivered,with a single dose of 3-5 Gy per fraction,one fraction per day,5 fractions per week,and totally 10-17 fractions.The PTV edge total dose was 36-51 Gy,and the GTV edge total dose was 60-85 Gy.The patients were followed up for a median time of 24 months to evaluate the local control rate and overall survival rate.Results Of the 9 patients,1 presented complete remission (11.1％) and 4 partial remission (44.5％),with a total effective rate of 55.6％.The 1-,3-,and 5-year local control rates were 64.8％,43.2％,and 43.2％ respectively.The 1-,3-,and 5-year overall survival rates were 66.7％,53.3％,and 35.6％ respectively.Four patients (44.4％) had acute radiation reaction:2 cases with grade l leukocytopenia and 2 cases with grade 1 gastrointestinal reactions.Two patients showed grade 2 late radiation-induced reaction in gastrointestinal system.The Karnofsky score was significantly increased and the renal function was normal after radiotherapy.Conclusions Stereotactic γ-ray body radiation therapy is safe and effective in the treatment of asynchronous bilateral renal cell carcinoma.
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Fourteen patients with pancreatic carcinoma were selected. Two treatment plans were designed for each patient, including gamma knife and Tomotherapy. The dose characteristics were evaluated by DVH and were compared. The results showed that the gamma knife plan had the higher maximal and mean target dose than Tomotherapy. Body gamma knife can increase the target dose significantly, and decrease the OAR dose. Tomotherapy had excellent dose-target conformality, and it can control doses of duodenum and stomach easily, but it had larger low dose region.
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Humans , Pancreatic Neoplasms , Radiotherapy , Radiosurgery , Methods , Radiotherapy Dosage , Radiotherapy Planning, Computer-Assisted , MethodsABSTRACT
Objective To evaluate the efficacy and side effects of whole body γ/-knife in patients with limited pancreatic carcinoma. Methods 111 patients with limited pancreatic carcinoma treated with the Stereotactie Gamma Ray Whole-Body Therapeutic System (Whole Body T-knife) were retrospectively an-alyzed. Patients were supine, fixed with a stereotactic body frame and vacuum bag, and then simulated by low-speed computed tomography. GTV, CTV and PTV were defined on the contrast-enhanced CT scans. It was required that 50% isedose line covered 100% of PTV and 70% isedose line covered more than 80% of GTV. The prescription dose was defined as 50% isodose. All patients were treated 5 fractions per week. The fractionated dose was 3-4 Gy for pancreatic head carcinoma, and 4-5 Gy for pancreatic body/tail carcino-ma. Irradiation of 40-51 Gy and 60-70 Gy were delivered to PTV and GTV margins, respectively. Re-suits The complete response rate, partial response rate and overall response rate of the primary tumors were 29.7%, 42.3% and 72.1%, respectively. The follow-up rate was 95.5%. The number of patients fol-lowed-up at 1-,2- and 3-year was 105,89 and 60. The 1-, 2- and 3-year overall survival rates were 49.3%,24.5% and 18.1%. For patients with stage Ⅰ/Ⅱ disease,the number of patients followed-up at 1-,2-,3-,4-and 5-year was 55,44,29,16 and 11 ;The 1-, 2-, 3-,4- and 5-year overall survival rates were 68%,34%, 30%, 21% and 17%, respectively. For patients with stage Ⅲ disease,the number of patients fol-lowed-up at 1-,2- and 3-year was 50,45 and 31 ;The 1-, 2- and 3-year overall survival rates were 28%,14% and 4%, respectively (χ~2=16.67, P=0.000). The acute side effects including nausea, vomiting and diarrhea were 71.2% of RTOG grade 1 -2 and 3.6% of RTOG grade 3. No treatment delay occurred.Conclusions With fractionated dose of 3-5 Gy,5 fractions per week and 40-51 Gy as total dose to PTV,whole body γ-knife is safe and effective to treat limited pancreatic carcinoma. The local control and overall survival could be improved.