Purpose: Dosimetric analysis and effect of different definitions of prescription point “A” to OAR in high dose rate brachytherapy for cervical cancer. Methods and Materials: This retrospective comparative dosimetric study is based on the data of 25 patients with histologically proven cervical carcinoma treated with HDR (high-dose-rate) brachytherapy. Patients received 21 Gy in three fractions (7.0 Gy X three fractions) to point A (AMAN, revised Manchester definition). Further, the patients were replanned with the new point A (AABS) as per the American Brachytherapy Society/ICRU 89 which is defined on CT images. The data compiled was then compared with the data observed from point A (AMAN). Results: When AMAN normalization method was used, the mean dose to the bladder at 0.1cc, 1cc, 2cc and 5cc obtained was 1121.2±54.5, 1058.7±44.1, 875.0±38.6, 780.5±35.9, and 641.2±29.5 cGy respectively. Likewise, using the ICRU-89 point A (ABS) normalization method, the mean dose to 0.1 cc, 0.2 cc, 1 cc, 2 cc, and 5cc bladder volumes was 1178±156.1,1110.0±130.8, 921.6±111.4, 826.6±101.32, and 673.3±80.9 cGy, respectively. For the rectum, point A (MAN) normalization plans, the mean dose of 0.1 cc, 0.2 cc,1 cc, 2 cc, and 5cc rectum volumes was 680±143.5, 652.53±129.8,574.25±131.1, 530±126.9, and 452.5±121.2cGy, respectively. Likewise, using the A (ABS) plan, the mean dose of 0.1 cc, 0.2cc, 1 cc, 2 cc, and 5cc rectum volume was 707.5±148.1, 678.7±128.7, 596.2±135.6, 551.25±127.44 and 471.25±122.64 cGy respectively. The statistical mean difference of Total Reference Air Kerma rate, V100 (cc), bladder, and rectum, was found significant. Conclusion: The present study attempts to analyze the differences in rectum and bladder dose, as well as the size of the volume enclosed for prescribed Isodose curve following ICRU 38 and ABS-ICRU 89 recommendations about intracavitary cervix cancer treated with brachytherapy. With Manchester system being more static, i.e., lesser variation with geometric changes, it is preferable in comparison to ABS system.
Background: Present study compares two high-dose-rate intracavitary brachytherapy (ICBT) planning methods using two-dimensional orthogonal radiography and three-dimensional computed tomography (3D-CT) with regard to dose to target volume and organs at risk (OAR) in carcinoma cervix. Methodology: ICBT plans for 22-patients were compared using 2D planning and three-dimensional computed tomography (3D-CT) planning techniques. 2D treatment plans were generated using 2D-orthogonal images and dose was prescribed at Point A while 3D-CT plans were generated using 3D-CT images after contouring target volume and organs at risk. In 2D planning rectal and bladder doses were assessed as per ICRU-38 and in 3D planning, 0.1cc, 0.2cc, 0.5cc and 1cc doses of bladder and rectum were evaluated. Doses to target and organ at risks (rectum and bladder) were compared for each planning method. Results: Mean dose received by D90, D95 and D100 was 8.05±1.59Gy, 7.19±1.43Gy and 4.79±0.93Gy respectively. ICRU bladder and rectal point doses were 5.19±1.36Gy and 5.03±0.36Gy respectively. Mean dose received by bladder D0.1cc, D0.2cc, D1cc, D2cc and D5cc was 2.38±0.80, 2.22±.75, 1.85±0.64, 1.51±0.64 and 1.29±.49 times higher than ICRU bladder reference point dose. Similarly mean dose received by rectum D0.1cc, D0.2cc, D1cc, D2cc and D5cc was 1.49±0.27, 1.43±.25, 1.25±0.23, 1.09±0.21 and 0.93±.21 times higher than ICRU rectal reference point dose. Conclusion: This study demonstrates suboptimal target coverage and underestimation of dose to OAR by 2-dimensional radiography when actual dose estimation was done by 3-dimensional brachytherapy planning for the same brachytherapy session.
Purpose of study: To evaluate the efficacy and safety of oral pilocarpine concomitantly with radiation treatment for the prevention of radiation induced xerostomia in Head and Neck cancer patients. Material and methods: A prospective randomized study was carried out on 60 histopathological proven squamous cell cancer patients of Head and neck region. All patients received a total radiation dose of 66Gy /33 fraction/6.2 weeks (2Gy/fraction, 5 days/ week) on Telecobalt machine with or without concurrent chemotherapy. The concurrent chemotherapy eligible patients received, weekly chemotherapy courses using cisplatin 30 mg/m2. Patients in the study group received oral pilocarpine 5.0 mg three times a day starting 3 days prior to start of radiotherapy and continued for 3 months post radiotherapy. Patients were evaluated on subjective basis based on Zimmerman Questionnaire and EORTC QLQ HN 35. The statistical analysis was done by Paired sample T test. Results: The average Zimmerman Xerostomia score for all parameters combined was as follows: First assessment -100mm vs 100mm; Second assessment -50mm vs 45mm; Third assessment -59mm vs 52mm; Fourth assessment -64mm vs 57mm, Fifth assessment -71mm vs 68. As per QLQ-HN 35 questionnaire used for assessment of quality of life of patients in both groups, we observed that better scores were obtained in the pilocarpine group in comparison to control group. Conclusion: In the present study, the effectiveness of Pilocarpine given during and 3 months post radiotherapy was observed in terms of better compliance during radiation treatment. Most of the patients had less subjective symptoms with lesser grades of toxicities observed during various phases of assessment post RT.
Aim: To compare the effect of two RT schedules for thoracic palliation in advanced NSCLC patients (30 Gy in 10 fractions over two weeks and 27 Gy in 6 fractions over three weeks, 2 fractions per week) on pulmonary symptoms, radiological response of the primary thoracic tumour, pulmonary functions and acute toxicities. Material and method: A hospital based quantitative prospective follow-up study. Total 104 advanced NSCLC patients were randomized into two fractionation arms. Evaluation was done pretreatment and 4 weeks after end of RT. Symptoms palliation and radiological response to RT & radiation pneumonitis were assessed by using RTOG 4-point scale and Revised (RECIST) guideline version 1.1 respectively. Radiotherapy was given by Cobalt-60 teletherapy machine. Results: Total 96 patients were evaluated for symptom palliation, radiological response and acute toxicities. The percentage of patients achieving symptom palliation was slightly higher in the control arm. At 1st month of follow-up, 16.67% & 18.75% patients in Study & control arm showed PR. Post-RT mean FVC and FEV1 showed a tendency for improvement in both mean FVC and FEV1 in compare to baseline. Treatment was well tolerated both arms. Grade I nausea and vomiting developed in 43% and 37.5% patients in Study and Control Arm respectively. 58% & 39% patients developed Grade 1 radiation pneumonitis as cough & dyspnea in study and control arms respectively. Grade 2 radiation pneumonitis was developed in 2 patient of study arm at 3rd week of follow-up but they lost follow up. Around 31% patients developed Grade1 esophagitis as dysphagia in both arms at 1 week of follow-up which was reduced up to 7% by 2nd week. A very few patients developed grade1 skin reaction as dermatitis in 1st week of treatment. The difference in symptom palliation, radiological response, pulmonary functions and acute toxicities in both arms was not statistically significant. Conclusion: The two RT fractionation schedules showed equal efficacy in terms of symptoms palliation, radiological response of the primary thoracic tumor, pulmonary functions and acute toxicities. Thus the 27 Gy/6 fractionation arm appears preferable compared to 30 Gy/10 arm to minimize the patients’ visits and load on the machines.
Ovarian involvement in multiple myeloma is extremely rare. This paper reports a case of a 50-year-old female who presented with lower back and chest pain of one-month duration. Computed tomography imaging showed lytic lesions in the sternum, ribs, thoracic and lumbar vertebrae with a right adnexal mass. On pathological examination, plasmacytoma was confirmed from the adnexal mass. Bone marrow examination revealed plasma cell infiltration in bone marrow with positive light chain IgG lambda type in serum and raised microglobulin. She was finally diagnosed as a case of IgG lambda myeloma with ovarian plasmacytomas (RISS II).
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