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Introduction The International Federation of Gynecology and Obstetrics (FIGO) changed the staging system for cervical cancer in 2018 and formally allowed cross-sectional imaging for staging purposes. Stage IB is now divided into three substages based on tumor size (IB1 < 2 cm, IB2 2-4 cm and IB3 > 4 cm). The presence of lymph nodes in the pelvis or para-aortic region will upstage the patient to stage IIIC. The purpose of this study was to evaluate the extent of stage migration using the FIGO 2018 staging system for cervical cancer and validate the new staging system by assessing the survival outcomes. Methods An Institutional Review Board-approved and Health Insurance Portability and Accountability Act-compliant retrospective analysis was performed on 158 patients from the cervical cancer database at the University of Mississippi Medical Center, USA. Patients had been treated between January 2010 and December 2018, and they were all staged according to the FIGO 2009 staging system previously. We collected data regarding tumor size, lymph node presence, and extent of metastatic disease in the pretreatment CT, positron emission tomography (PET), or MRI scans and restaged the patients using the FIGO 2018 system. The extent of stage migration was evaluated using the new staging system. We analyzed the three-year overall survival (OS) using both FIGO 2009 and 2018 staging systems for validation purposes. Kaplan-Meier analyses were performed using SPSS version 24. Results Fifty-nine percent of the patients were upstaged when they were restaged using the FIGO 2018 staging system. In the current 2018 staging system, Stage IB3 accounted for 4%, and Stage IIIC accounted for 48% of the patient cohort, while other stages accounted for the rest. The median overall survival of the entire cohort was 20.5 months. There was a change in the survival curves using FIGO 2018 stages compared to those of FIGO 2009. There was a numerical improvement in three-year OS in stages IB and III among the two staging systems; however, it was not statistically significant. Interestingly, the three-year overall survival of Stage IIIC patients was better when compared to Stages III A& B combined (61% vs. 25%, p=0.017). Conclusion The increased availability of cross-sectional imaging across the world has led to recent changes in the FIGO staging system for cervical cancer, which allowed imaging in staging. We identified a significant stage migration in our patient cohort with the FIGO 2018 staging system, but no difference in the three-year overall survival was observed. Local tumor extent may be a worse prognostic indicator than nodal metastasis among stage III patients.

Introduction Stereotactic body radiation therapy (SBRT) is an effective treatment for early-stage non-small cell lung cancer (NSCLC) patients who are either medically inoperable or who decline surgery. SBRT improves tumor control and overall survival (OS) in medically inoperable, early-stage, NSCLC patients. In this study, we investigated the effectiveness of two different SBRT doses commonly used and present our institutional experience. Purpose To determine the clinical outcomes between two treatment regiments (50 Gray [Gy] vs. 55 Gy in five fractions) among Stage I NSCLC patients treated with SBRT at a state academic medical center. Methods We performed a retrospective analysis of 114 patients with Stage I (T1-2 N0 M0) NSCLC treated at a state academic medical center between October 2009 and April 2019. Survival analyses with treatment regimens of 50 Gy and 55 Gy in five fractions were conducted to detect any improvement in outcomes associated with the higher dose. The primary endpoints of this study included OS, local control (LC), and disease-free survival (DFS). Log-rank test and the Kaplan-Meier method were used to analyze the survival curves of the two treatment doses. The SPSS v.24.0 (IBM Corp., Armonk, NY, USA) was used for statistical analyses. Results The 114 early-stage NSCLC patients (median age, 68 years; range 12 to 87 years) had a median follow-up of 25 months (range two to 86 months). The number of males (n = 72; 63.2 %) exceeded the number of females (n = 42; 36.8 %). The majority of patients in this study were Caucasians (n = 68; 59.6 %) and 46 patients were African Americans (40.4 %). Two-thirds of the patients (n = 76; 66.7 %) were treated with 50 Gy in five fractions, and 38 patients (33.3 %) with 55 Gy in five fractions. The one-, two-, and three-year OS and DFS rates were improved in the patients treated with 55 Gy [OS, 81.7 % vs. 72.8 %; 81.7 % vs. 58.9 %; 81.7 % vs. 46.7 % (p = 0.049)], [DFS, 69.7 % vs. 69.7 %; 61.9 % vs. 55.7 %; 61.9 % vs. 52.0 % (p = 0.842)], compared to those treated with 50 Gy. Adenocarcinoma was the most common histology in both groups (51.3 % and 68.4 %). Failure rates were elevated for the 50 Gy regimen [39 (34.2 %) vs. 12 (8.5 %)]. Three year control rates were (66.3 % vs. 96.6 %; p = 0.002) local control; (63.3 % vs. 94.4 %; p = 0.000) regional control; and (65.7 % vs. 97.1 %; p = 0.000) distant control, compared to those treated with 55 Gy. Conclusion Early-stage NSCLC patients treated with SBRT 55 Gy in five fractions did better in terms of local control, overall survival, and disease-free survival rates compared to the 50 Gy in five fractions group.

Introduction As traditional measures such as overall survival (OS) or disease-free survival (DFS) alone do not give a holistic view of the outcomes of a treatment paradigm, we determine to add the evidence of quality-adjusted life year (QALY) and disability-adjusted life year (DALY) to the outcomes of the nasopharyngeal carcinoma patients (NCP) treated with definitive chemoradiation therapy (chemoRT) with or without induction chemotherapy (induction chemo). Methods This is a retrospective analysis of 85 NCPs treated at an academic state institution. The OS estimated by the Kaplan-Meier method and the multivariate Cox regression model determined the co-variables associated with the OS. The relationship between QALYs gained and DALYs saved were calculated from age of the disease onset, duration of the disease, quality of life (QoL) and disability weights. Results Of the 85 eligible NCPs of this cohort, the disease frequency distribution per the World Health Organization (WHO) classification was 41.2% for Type-I, 42.4% for Type-II, and 16.5% for Type-III. The median follow-up (24 months). The five-year OS of patients treated with concurrent chemoRT vs. induction chemo followed by concurrent chemoRT was 54.7 vs. 14.8% for WHO Type I, 60.1 vs. 58.3% for WHO Type II, and 83.3 vs. 50.0% for WHO Type III (p=0.029). The average DALYs saved with concurrent chemoRT were 12.2 years vs. 5 years for induction chemo followed by concurrent chemoRT. The average QALYs gained with concurrent chemoRT were 6.9 years vs. 3.1 years for induction chemo followed by concurrent chemoRT. Conclusion Patients treated with concurrent chemoRT had an increased QoL when compared to induction chemo followed by concurrent chemoRT. The average DALYs saved were higher in the patients treated with concurrent chemoRT than treated with induction chemo followed by concurrent chemoRT.

Objective The purpose of this study was to identify racial disparities in treatment outcomes, if any, among patients with carcinoma of the cervix treated at a tertiary care institution in the state of Mississippi. Methods A retrospective review of patients with carcinoma of the cervix treated in the Department of Radiation Oncology at our institution between 2010 and 2018 was performed. Data regarding demographics, disease stage, treatments administered, and follow-up were collected. Patient outcomes, including median survival and overall survival, were analyzed using the Kaplan-Meier method. All analyses were performed using SPSS Statistics version 24 (IBM, Armonk, NY). Results Between January 2010 and December 2018, a total of 165 patients with carcinoma of the cervix were treated at our institution. We had a significantly higher proportion of African American (AA) compared to Caucasian American (CA) patients (59.4 vs. 36.4%; p=0.03). There was a significant difference in the disease stage at the time of presentation between AA and CA in that compared to AA women, a higher number of CA patients presented with locally advanced disease [Federation of Gynecology and Obstetrics (FIGO) stages IB2 to IVA] (78.6 vs. 86.7%; p

Introduction This study attempted to identify disparities in outcomes between African American (AA) and Caucasian American (CA) patients treated for hypopharyngeal carcinoma at a tertiary care institution over the past 25 years. Methods An institutional review board (IRB)-approved and Health Insurance Portability and Accountability Act (HIPPA)-compliant retrospective analysis was performed on patients with squamous cell carcinoma of the hypopharynx treated at our institution between January 1994 and December 2018. Data regarding demographics, stage, treatment, and follow-up were collected. Outcomes, including median survival and overall survival, were calculated using the Kaplan-Meier method. All analyses were performed using the Social Packages for the Social Sciences (SPSS) v. 24 (IBM Corp., Armonk, NY). Results We identified 144 hypopharyngeal carcinoma patients who were treated during this period. Our patient cohort consisted of 61.8% AA and 35.4% CA (P=0.538). Overall, 96% of them presented at an advanced stage (Stages III & IV) of the disease, and only 4% presented in the early stages (Stages I & II). There was no significant difference between AA and CA patients who presented with advanced disease (96.6% vs. 94.1%). In our patient cohort, 15.3% of patients did not receive any therapy; however, 51.4%, 22.9%, and 10.4% of them underwent definitive chemoradiotherapy, definitive surgery, or palliative chemotherapy, respectively. There were no significant differences in patient racial proportions within each treatment group. The median follow-up of the entire cohort was 13 months. There was no significant difference between the median survival of AA and that of CA patients (16 months vs. 15 months; p=0.917). Moreover, there was no significant difference in the overall survival between AA and CA patients at three years (27.2% vs. 36.3%; p=0.917) and five years (20.4 % vs. 16.7 %; p=0.917). Conclusions A retrospective review of patients with hypopharyngeal cancer treated at our institution over the previous 25 years did not identify significant racial disparities regarding the stage at presentation or prognosis. This study suggests that when patients have equal access to care, they appear to have a similar prognosis despite racial differences. Further studies are needed to validate this hypothesis.

Purpose: The Joint Commission has encouraged the healthcare industry to become “High Reliability Organizations” by “Chasing Zero Harm” in patient care. In radiation oncology, the time point of quality checks determines whether errors are prevented or only mitigated. Thus, to “chase zero” in radiation oncology, peer review has to be implemented prior to treatment initiation. A multidisciplinary group consensus peer review (GCPR) model is used pre-treatment at our institution and has been successful in our efforts to “chase zero harm” in patient care. Methods: With the GCPR model, policy-defined complex cases go through a treatment planning conference, which includes physicians, residents, physicists, and dosimetrists. Three major plan aspects are reviewed: target volumes, target and normal tissue dose coverage, and dose distributions. During the review, any team member can ask questions and afterwards a group consensus is taken regarding plan approval. Results: The GCPR model has been implemented through a commitment to peer review and creative conference scheduling. Automated analysis software is used to depict color-coded results for department approved target coverage and dose constraints. About 8% of plans required re-planning while about 23% required minor changes. The mean time for review of each plan was 8 min. Conclusions: Catching errors prior to treatment is the only way to “chase zero” in radiation oncology. Various types of errors may exist in treatment plans and our GCPR model succeeds in preventing many errors of all shapes and sizes in target definition, dose prescriptions, and treatment plans from ever reaching the patients.

Purpose: The objective of this study is to evaluate local control and survival rates of node negative triple negative breast cancer patients (TNBCs) treated with radiotherapy (RT) in our institution. Methods: This is a retrospective analysis of 67 TNBCs (2007 - 2017) at an academic state institution who underwent lumpectomy and /or mastectomy (surgery) followed by adjuvant irradiation to median total dose of 50 Gy (range 40.5-50.40 Gy). Chemotherapy was administered in a neoadjuvant (31) or adjuvant setting (36). For all 67 TNBCs, local control (LC), overall survival (OS) and disease free survival (DFS) were estimated using the Kaplan-Meier method. The significance of survival variables were analyzed using the Cox univariate and multivariate proportional hazards model. A p-value of less than 0.05 was considered statistically significant. The SPSS 24.0 software was used for data analysis. Results: The baseline characteristics of all 67 TNBCs were measured with median follow up of 58 months (range 10-142 months). Patients were stratified into two groups (neoadjuvant chemotherapy-RT (31) vs. adjuvant chemotherapy-RT (36)). The median rates for LC, DFS and OS were 27 % vs. 68 % (p= 0.001), 27.2% vs. 63.2 % (p= 0.034), and 63.4% vs. 92.5% (0.001) respectively. On Cox multivariate analysis, patients who received adjuvant chemotherapy were associated with statistically improved significant LC (p= 0.002) and OS (p=0.005). The variables included were: ethnicity (p=0.251), age (p=0.984), BMI (p=0.032), lump boost (p=0.300), TNM (p=0.162) and tumor grade (p=0.336). Conclusion: Among TNBC patients undergoing RT, adjuvant chemotherapy appears to be better than neoadjuvant chemotherapy in determining the clinical outcomes. Citation Format: Mary R. Nittala, Eswar K. Mundra, Satya Packianathan, Divyang Mehta, Maria L. Smith, William C. Woods, Shawn McKinney, Barbara S. Craft, Srinivasan Vijayakumar. Triple negative breast cancer patients treated with radiation therapy: Improvement in survival and local control with adjuvant chemotherapy compared to neoadjuvant chemotherapy [abstract]. In: Proceedings of the Annual Meeting of the American Association for Cancer Research 2020; 2020 Apr 27-28 and Jun 22-24. Philadelphia (PA): AACR; Cancer Res 2020;80(16 Suppl):Abstract nr 6177.

Pregnancy is associated with maternal bone mineral density loss and modulation of calcium metabolism. We hypothesized that pregnancy may decrease the risk of heterotopic ossification (HO) after trauma. This is a single-institution, University of Mississippi Medical Center, retrospective study investigating the effect of pregnancy on the incidence HO after surgical repair (SR) of displaced acetabular fractures. Between January 1998 and 2010, 257 non-pregnant women (Group A) and 16 pregnant women (Group B) were identified. All the non-pregnant women received radiation therapy (RT) ± indomethacin. None of the pregnant women in group B received any prophylaxis. After a median follow-up of 6.6 years the incidence of HO in all patients was 27% (75/273). In Group A, non-pregnant, women who received RT ± indomethacin, 29% developed HO; HO risk was 0.4. In Group B, 16 pregnant patients, only one developed HO (6%); HO risk was 0.06. Thus, the risk of HO appears to be nearly six-fold higher in non-pregnant women despite prophylactic RT ± indomethacin. Our data suggest that pregnancy may be associated with a reduced risk of HO after SR of displaced acetabular fractures. Further analysis with a larger pregnant patient sample is necessary to confirm this finding. © 2013 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 31: 944–948, 2013

Purpose/Objective(s): Stereotactic body radiation therapy (SBRT) is an effective treatment for patients with early-stage non-small cell lung cancer (NSCLC) who are not surgical candidates or who refuse surgical management. In this study, we report on our clinical outcomes and toxicity in the treatment of early-stage NSCLC with SBRT. Methods and Materials: Fifty-five patients with 59 T1-2N0M0 NSCLC lesions were treated at our institution between December 2009 and August 2014. The majority of the patients [38 (69%)] were treated with 50 Gy in 5 fractions, 7 patients (13%) with 48 Gy in 4 fractions, 8 patients (14%) with 60 Gy in 3 fractions, 1 patient (2%) with 62.5 Gy in 10 fractions, and 1 patient (2%) with 54 Gy in 3 fractions. Tumor response was evaluated using RECIST 1.1, and toxicity was graded using the CTCAE (Common Terminology Criteria for Adverse Events) version 3.0. The primary endpoints of this retrospective review included rates of overall survival, disease-free and progression-free survival, local failure, regional failure, and distant failure. A secondary endpoint included radiation-related toxicities. Results: The median follow-up was 23.8 months (range 1.1-57.6). The 3-year local control, progression-free survival, and overall survival rates were 91, 55, and 71%, respectively. The median age at diagnosis was 67.9 years (range 51.4-87.1). There were a total of 54 T1N0 tumors (92%) and 5 T2N0 lesions (8%). Adenocarcinoma was the most common pathology, comprising 54% of the lesions. A total of 16 of the patients (29%) failed. Among these, 5 local (9%), 14 regional (25%), and 4 distant failures (7%) were observed. On follow-up, one patient had grade 2 and another had grade 5 pneumonitis. Three patients experienced grade 2 chest wall tenderness. Two patients had grade 1 rib fractures, one of which could not be discerned from radiation-induced toxicity versus a traumatic fall. Conclusion: The University of Mississippi Medical Center SBRT experience has shown that SBRT provides satisfactory local control and overall survival rates with minimal toxicity in early-stage NSCLC patients.

Obesity is associated with a chronic low inflammatory process that may act as common soil for the pathogenesis of obesity-related comorbidities including heterotopic ossification (HO). The purpose of this study is to compare the incidence of HO between patients with body mass index (BMI)40 versus ≥40 after operative treatment of displaced acetabular fractures followed by radiation therapy (RT) ± indomethacin.This is a single institution retrospective chart review of 419 patients. All patients with well-documented BMI underwent operative treatment followed by RT ± indomethacin. All patients received 700 cGy to the soft tissues around the proximal femur and acetabulum without bone shielding. All RT were given postoperatively within 72 hours. The patients were divided into 2 groups: Group (A) BMI40 and Group (B) BMI ≥40. HO was assessed with X-ray. BMI was used as a surrogate measure to test the risk of HO despite prophylaxis.The incidence of HO among all patients is 21% (89 of 419), while among those in group A (BMI40), 68 of 374 patients developed HO (18%); in the morbidly obese group (BMI ≥40) 21of 45 patients developed HO (47%). The difference between the rates of HO in the 2 groups was 29%; the χ(2) test showed a significant difference between the 2 BMI groups (P.001 at α = 0.05).There is a higher incidence of HO among the morbidly obese patients despite RT ± indomethacin. RT doses for HO prophylaxis in morbidly obese patients need to be reassessed; also, understanding the signaling pathways in target tissues in obese patients at which adipokines control metabolism may reveal novel therapies. Higher radiation doses ± indomethacin may need to be considered and optimally evaluated in the context of a prospective, randomized clinical trial.

To analyze the impact of different body mass index (BMI) as a surrogate marker for heterotopic ossification (HO) in patients who underwent surgical repair (SR) for displaced acetabular fractures (DAF) followed by radiation therapy (RT).This is a single-institution retrospective study of 395 patients. All patients underwent SR for DAF followed by RT ± indomethacin. All patients received postoperative RT, 7 Gy, within 72 h. The patients were separated into four groups based on their BMI:18.5, 18.5-24.9, 25-29.9, and30. The end point of this study was to evaluate the efficacy of RT ± indomethacin in preventing HO in patients with different BMI.Analysis of BMI showed an increasing incidence of HO with increasing BMI:18.5, (0%) 0/6 patients; 18.5-24.9 (6%), 6 of 105 patients developed HO; 25-29.9 (19%), 22 of 117;30 (31%), 51 of 167. Chi-square and multivariate logistic regression analysis showed that the correlation between odds of HO and BMI is significant, p0.0001. As the BMI increased, the risk of HO and Brooker Classes 3, 4 HO increased. The risk of developing HO is 1.0× (10%) more likely among those with higher BMI compared with those with lower BMI. For a one-unit increase in BMI the log odds of HO increases by 1.0, 95% CI (1.06-1.14). Chi-square test shows no significant difference among all other factors and HO (e.g., indomethacin, race, gender).Despite similar surgical treatment and prophylactic measures (RT ± indomethacin), the risk of HO appears to significantly increase in patients with higher BMI after DAF. Higher single-fraction doses or multiple fractions and/or combination therapy with nonsteroidal inflammatory drugs may be of greater benefit to these patients.

Background: The United States Preventive Task Force recommended against the prostate-specific antigen (PSA)-based screening for prostate cancer in 2012, a recommendation that applies to all American men. African-American men, however, have the highest incidence of prostate cancer and are more likely to be diagnosed with an advanced stage and poor prognostic-form of prostate cancer. The incidence of prostate cancer is almost 60% higher, and the mortality rate is two- to three-times greater among African Americans than that of Caucasian men1. The Veteran's Health Administration is an unbiased, race-color blind, equal and open access, single-payor, government run health care system2. Yet, due to complex interactions of ethnicity, biology, comorbidities, environmental interactions, as well as social causes, African-American veterans are present with more aggressive disease and carry a worse outcome. Therefore African-American veterans need specific interventions to improve prostate cancer outcomes; i.e., improve survivals and quality of life. We hypothesize that by developing specific and structured prostate cancer screening recommendations, we can improve the overall prostate cancer outcomes among African-American veterans. Methods: We performed a PubMed search using the keywords: African American, African American veterans, Prostate cancer, Outcomes, Molecular markers, Prostate-specific Antigen velocity, and PSA density to derive data relevant to our hypothesis. Results: 1. Men over the age of 65 are most susceptible to prostate cancer, and the average age of veterans is 582. So, they are at a nearly optimal age for preventative prostate cancer screening. 2. The USPSTF guidelines were based on two studies, and one of these studies reported that only 4% of its participants were African American. So, it is inappropriate to use the same guidelines for African American veterans. 3. Several aspects of prostate cancer are different between African Americans and Caucasians. These differences include prostate cancer incidence and outcome, genetic differences, comorbidity, PSA levels, social barriers, and course of the disease. 4. Prior to the new USPSTF guidelines, African American veterans were just as likely as white veterans to undergo PSA testing3. 5. Among the diseases linked to comorbidity with prostate cancer, cardiovascular disease is the most frequent. Hence, the leading cause of death in both the African-American population and the African-American veteran population is cardiovascular disease.2 Conclusion: 1. Because there is no cure for metastatic prostate cancer, early diagnosis and intervention for African-American veterans will lead to saving lives; specific guidelines for prostate cancer will be very beneficial. 2. This will also decrease the costs of treating recurrent and metastatic disease and conserve the resources of the VA Health System. 3. Because the Veterans Health System is equal access, it is an optimal environment to test different prostate cancer screening guidelines for African Americans. 4. Specific draft guidelines will be presented. References: 1. Shenoy D, Packianathan S, Chen AM, Vijayakumar S. Do African-American men need separate prostate cancer screening guidelines? BMC Urology. 2016;16:19. doi:10.1186/s12894-016-0137-7. 2. Veterans Health Administration. Veterans Health Administration. http://www.va.gov/health/. Published June 21, 2016. Accessed June 23, 2016. 3. Hudson MA, Luo S, Chrusciel T, et al. Do Racial Disparities Exist in the Use of Prostate Cancer Screening and Detection Tools in Veterans? Urologic oncology. 2014;32(1):34.e9-34.18. doi:10.1016/j.urolonc.2013.01.003. Citation Format: Arthi Gadum Reddy, Divya Shenoy, Satya Packianathan, Shankar Giri, Srinivasan Vijayakumar. Do African-American veterans need distinct “Prostate Cancer Screening Guidelines” to overcome outcome disparities? [abstract]. In: Proceedings of the Ninth AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2016 Sep 25-28; Fort Lauderdale, FL. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2017;26(2 Suppl):Abstract nr C85.

To report the impact of computerized tomography (CT) based radiotherapy (RT) on heterotopic ossification (HO) outcomes.This is a single institution, retrospective study of 532 patients who were treated for traumatic acetabular fractures (TAF). All patients underwent open-reduction internal-fixation (ORIF) of the TAF followed by RT for HO prophylaxis. Postoperative RT was delivered within 72h, in a single fraction of 7Gy. The patients were divided into 2 groups based on RT planning: CT (A) vs. clinical setup (B).At a median follow up of 8years the incidence of HO was 21.6%. Multivariate regression analysis revealed that group (A) vs. (B) had HO incidence of 6.6% vs. 24.6% (p0.001), respectively. Furthermore, HO Brooker grade ≥3 was observed in 2.2% vs. 10.8% (p=0.007) in group (A) vs. (B), respectively. Thus, the odds of developing HO and Brooker grades ≥3 were 4.7 and 4.5 times higher, respectively, in patients who underwent clinical setup.Our data suggest that using CT based RT allowed more accurate delineation of the tissues and better clinical outcomes. Although CT-based RT is associated with additional cost the efficacy of CT-based RT reduces the risk of HO, thereby decreasing the need for additional surgical interventions.

The Impact of Total External Beam Radiation Therapy and Brachytherapy Package Duration on the Outcome of Cervical Cancer Treated With Radiation Alone or With Concomitant Chemotherapy J.K. Ma, R.M. Allbright, S. Packianathan, L. Harrell, E. Chinchar, W.F. Mourad, A. Albert, and S. Vijayakumar; University of Mississippi Medical Center, Jackson, MS, University of Mississippi School of Medicine, Jackson, MS, Mount Sinai Beth Israel, Montefiore Medical Center and Albert Einstein College of Medicine, New York, NY, Mercer University School of Medicine, Macon, GA

Higher Energy Megavoltage Photon and Split Beam Technique Minimize the Testicular Dose During Radiation Prophylaxis of Heterotopic Ossification W.F. Mourad, J.K. Ma, C.C. Yang, R. He, M. Ryniak, R.A. Shourbaji, P.N. Mobit, J. Santoro, T. Nabhani, E. Katsoulakis, R. Kabarriti, A. Blakaj, S. Patel, W. Yan, D. Blakaj, M.A. Khan, S. Packianathan, R.L. Jennelle, G.V. Russell, and S. Vijayakumar; University of Mississippi Medical Center, Jackson, MS, Mount Sinai Beth Israel, Montefiore Medical Center and Albert Einstein College of Medicine, New York, NY

Purpose: To outline the steps taken to clinically implement TG-129 on Brachyvision™ Treatment Planning System and to show the dosimetric differences that can be expected from the original COMS Eye Plaque model. Methods: The original COMS-Eye Plaque protocol was based on the following simplification: point source model in infinite water medium, 1D geometric function, 1D radial dose function and no anisotropy. Recently, AAPM Task Group 129 had made two specific recommendations: 1> Upgrade to TG-43U1 line source model; and 2> Report the heterogeneity corrected dose. Upgrading to line TG-43U1 line source model was done by a creating a seed collection in Brachyvision (version 11) for each plaque size. For each seed in the collection, both end coordinates had to be entered into the software. Full line source model was followed to compute the homogeneous dose at the prescription point. This homogeneous dose was converted to heterogeneous dose using a conversion table. Dose to prescription points for five different plaque sizes, including one customized notched plaque, was calculated using the implemented TG-129 model and compared against actual COMS derived doses from previously treated patient plans. Conversion to heterogeneous doses was done based on table 2 of TG-129 report. Results: As expected, dose difference between COMS and TG-129 was relatively minor, ranging from -0.15% to 1.91% at the prescription point. On the other hand, heterogeneous dose, which should be used for reporting purpose only, can be up to ∼17% lower than the corresponding homogeneous dose. Conclusion: Conversion to TG-129 can be rapidly accomplished in 1–2 weeks. The initial time investment can be quickly recouped since the TPS plans created can be modified for different patient cases. Dosimetric difference between TG-129 and the original COMS model is small, generally less than 2%.

Purpose: To investigate the clinical parameters involved in Syed interstitial HDR brachytherapy for patients with cervical carcinoma. Method and Materials:Our institution uses 3‐D image based treatment planning for all Syed Interstitial implants for advanced cervical carcinoma patients with known parametrical spread. Between 8/2009 and 10/2010, eight such patients were treated at our facility with Syed Interstitial HDR brachytherapy. The high risk CTV (HRCTV), intermediate risk CTV (IRCTV), and organs at risk (OAR: rectum, bladder, sigmoid, and small bowel) were contoured on the planning CT scan. All patients received 7 fractions of 4.2 Gy each in 4 days given bid prescribed to the HRCTV. Planning objectives included keeping doses to the OARs below 80% of prescription dose, to have D90 for the HRCTV greater than 90% of the prescription dose, and for V150 and V200 to be less than 50% and 20%, respectively. OARs were evaluated using doses to 2cc (D2cc). CT scan was performed each day. Results: Between 18 and 21 needles were implanted but only 14 needles were used. Because of needle movements, an average of 2.4 plans were required. The average dose to 2cc (D2cc) of bladder was 63±5% of the prescription dose (29.4 Gy). This value for the rectum was 64%±3.4% . The sigmoid and the small bowel D2cc values were generally all less than 40% of the prescription dose. The D90 for the HRCTV was on average 31.7 Gy, whereas the D90 for the IRCTV was on average 20 Gy. V150 and V200 were on average, 51% and 28%, respectively. Conclusion: It is recommended that CT/MRI images be used for Syed interstitial HDR planning to adequately define the HRCTV, IRCTV, and OAR. The implanted needles always move during patient transfers to and from the HDR suite; thus, CT scans should be repeated daily.