Empirical analysis of a plan-of-the-day strategy to approximate daily online reoptimization for prostate CBCT-guided adaptive radiotherapy.

PURPOSE: Adaptive radiotherapy (ART) can improve the dose delivered to the patient in the presence of anatomic variations. However, the required time, effort, and clinical resources are intensive. This work analyzed a plan-of-the-day (POD) approach on clinical patients treated with online ART to explore implementations that balance dosimetric benefit and clinical resource cost. METHODS: Eight patients treated to the prostate and proximal seminal vesicles with 26 fractions of CBCT-guided, daily online ART were retrospectively analyzed. With a plan library composed of daily adaptive plans from the initial week of treatment and the original plan, the effect of a POD approach starting the following week was investigated by simulating use of these previously generated plans under 3- and 6-degree-of-freedom patient alignment. The plan selected for each treatment was that from the library that maximized the Dice similarity coefficient of the clinical target volume with that of the current treatment fraction. The resulting distribution of several target coverage and organ-at-risk dose metrics are described relative to those achieved with the daily online reoptimized adaptive technique. RESULTS: The values of target coverage and organ-at-risk dose metrics varied across patients and metrics. The POD schemas closely approximated the reference values from a fully reoptimized adaptive plan yet required less than 20% of the reoptimization effort. The POD schemas also had a much greater effect on target coverage metrics than 6-degree-of-freedom registration did. Organ-at-risk dose metrics also varied considerably across patients but did not exhibit a consistent dependence on the particular schema. CONCLUSIONS: POD schemas were able to achieve the vast majority of the dosimetric benefit of daily online ART with a small fraction of the online reoptimization effort. Strategies like this might allow for more practical and strategic implementation of ART so as to benefit a greater number of patients.

Triggering daily online adaptive radiotherapy in the pelvis: Dosimetric effects and procedural implications of trigger parameter-value selection.

BACKGROUND: Online adaptive radiotherapy (ART) can address dosimetric consequences of variations in anatomy by creating a new plan during treatment. However, ART is time- and labor-intensive and should be implemented in a resource-conscious way. Adaptive triggers composed of parameter-value pairs may direct the judicious use of online ART. PURPOSE: This work analyzed our clinical experience using CBCT-based daily online ART to demonstrate how a conceptual framework based on adaptive triggers affects the dosimetric and procedural impact of ART. METHODS: Sixteen patients across several pelvic sites were treated with CBCT-based daily online ART. Differences in standardized dose metrics were compared between the original plan, the original plan recalculated on the daily anatomy, and an adaptive plan. For each metric, trigger values were analyzed in terms of the proportion of treatments adapted and the distribution of metric values. RESULTS: Target coverage metrics were compromised due to anatomic variation with the average change per treatment ranging from -0.90 to -0.05 Gy, -0.47 to -0.02 Gy, -0.31 to -0.01 Gy, and -12.45% to -2.65% for PTV D99%, PTV D95%, CTV D99%, and CTV V100%, respectively. These were improved using the adaptive plan (-0.03 to 0.01 Gy, -0.02 to 0.00 Gy, -0.03 to 0.00 Gy, and -4.70% to 0.00%, respectively). Increasingly strict triggers resulted in a non-linear increase in the proportion of treatments adapted and improved the distribution of metric values with diminishing returns. Some organ-at-risk (OAR) metrics were compromised by anatomic variation and improved using the adaptive plan, but changes in most OAR metrics were randomly distributed. CONCLUSIONS: Daily online ART improved target coverage across multiple pelvic treatment sites and techniques. These effects were larger than those for OAR metrics, suggesting that maintaining target coverage was our primary benefit of CBCT-based daily online ART. Analyses like these can determine online ART triggers from a cost-benefit perspective.

Online Adaptive Radiation Therapy and Opportunity Cost.

Purpose: Changes in patient anatomy and tumor geometry pose a challenge to ensuring consistent target coverage and organ-at-risk sparing; online adaptive radiation therapy (ART) accounts for these interfractional changes by facilitating replanning before each treatment. This project explored the opportunity cost of computed tomography (CT)-based online ART by evaluating time and human resource requirements. Time-driven activity-based costing (TDABC) was employed to determine the cost of this time to assess if the dosimetric benefit is worthwhile. Methods and Materials: CT-based online ART was recently employed at our institution and has been used to treat pelvic disease sites (prostate, prostate bed, prostate with nodal coverage, bladder, rectum); data points from all adaptively treated patients (415 fractions) were used. Time taken for each adaptive fraction before treatment, which at our facility is best represented by the duration between 2 cone beam CT scans, was used as a broadly applicable and transferable metric, representing the additional time required for ART on top of standard image guided radiation therapy. Dosimetric effect was also considered by taking the difference of planning target volume V100% for the scheduled and adapted plans. Using recently validated TDABC at this facility, the per fraction cost of ART was determined, reflecting the added cost of ART on top of image guided radiation therapy. Results: A median time of 15.97 (interquartile range, 13.23-18.83) additional minutes was required for each adaptive fraction. TDABC demonstrated an average minimum cost per adapted fraction of $103.58. Dosimetric differences between V100% of the scheduled versus adapted plan showed a mean dosimetric difference of 15.8%. Conclusions: Although online ART decreases the uncertainty of anatomic shifts, each adaptive fraction requires more staff time, delaying completion of other tasks and increasing resource utilization. Although toxicity benefits require further studies, the implementation of progressively complex radiation therapy technologies, like ART, requires consideration of the time and human resource requirements and subsequent opportunity cost.

Using Holistic Residency Applicant Review and Selection in Radiation Oncology to Enhance Diversity and Inclusion-An ASTRO SCAROP-ADROP-ARRO Collaboration.

Disproportionate sex, racial, and ethnic diversity remains in the radiation oncology physician workforce despite widespread awareness and longitudinal efforts to improve representation. In this collaborative review, we define the rationale and components of holistic review and how it can be best used to provide a comprehensive evaluation of applicants to residency programs in radiation oncology. We initially discuss the current state of diversity in the field of radiation oncology and highlight the components of the residency selection process that may serve to perpetuate existing biases. Subsequently, the Accreditation Council for Graduate Medical Education and Association of American Medical Colleges holistic review framework is reviewed in detail to demonstrate the balanced assessment of potential applicants. The implementation of holistic review in medical school and residency selection to date is examined to underscore the potential value of holistic review in the radiation oncology residency selection process. Finally, recommendations for the practical implementation of holistic review in radiation oncology trainee selection are outlined.

Academic patterns of practice regarding CT simulation scans and radiology review.

OBJECTIVE: Currently, there are no consensus guidelines about handling incidental radiological findings on radiotherapy planning CT simulation scans. Retrospective studies analyzing incidental findings on CT simulations show a small, but not insignificant, rate of both oncologic and non-oncologic findings. These findings may have medico-legal, financial, and clinical implications. Given a lack of guidelines, we obtained a formal survey of multiple academic institutions to evaluate how CT simulations are handled in regard to incidental findings. METHODS: A formal survey was developed consisting of 12 questions related to institutional practices regarding CT simulation scans. From 7/18/21 to 8/27/21 and 5/6/22 to 5/24/22, the survey was administered electronically by REDCap to key personnel at Academic Radiation Oncology Programs identified through the American Society for Radiation Oncology (ASTRO) with inclusion criteria including an active ACGME approved Radiation Oncology residency program. RESULTS: In total, 88 academic radiation oncology programs were surveyed with total of 45 responses (51%). 1 out of 45 departments who responded has formal guidelines regarding workup of incidental findings. There is variability about sending CT simulation scans for official radiology review if an incidental finding is identified. CONCLUSIONS: Based on a measurable rate of incidental findings on radiotherapy planning CT simulations and their possible implications, our survey illustrates a likely need for consensus recommendations for handling such findings to improve patient care and safety.

Adjuvant Radiation after Primary Resection of Atypical Lipomatous Tumors of the Extremity Reduces Local Recurrence but Increases Complications: A Multicenter Evaluation.

Background: Radiation after resection of an atypical lipomatous tumor (ALT) is controversial. This study evaluates local control and complications after the first resection of ALTs of the extremity with or without adjuvant radiation. Methods: A dual institution, retrospective review of patients treated from 1995 to 2020 with first-time resection of an ALT in the extremity was performed. In total, 102 patients underwent adjuvant radiation (XRT group) and 68 patients were treated with surgery alone (no-XRT group). The median follow-up time was 4.6 years (interquartile range (IQR) 2.0-7.3 years). The median radiation dose was 60 Gy (IQR 55-66 Gy). Univariable and multivariable analyses evaluated the association of patient, tumor, and treatment variables with recurrence and complications. Kaplan-Meier analysis evaluated local recurrence-free survival (LRFS) and time to complication. Results: The overall incidence of local recurrence was 1% (1/102) in the XRT group and 24% (16/68) in the no-XRT group (p < 0.001). The median time-to-recurrence was 8.2 years (IQR 6.5-10.5 years). In the XRT and the no-XRT groups, 5-yr LRFS was 98% and 92% (p=0.21) and 10-yr LRFS was 98% and 41% (p < 0.001), respectively. The absence of radiation (HR = 23.63, 95% CI (3.09-180.48); p < 0.001) and R2 surgical resection margins (HR = 11.04, 95% CI (2.07-59.03); p < 0.001) incurred a 23-fold and 11-fold increased risk of local recurrence, respectively, while tumor size, depth, location, and neurovascular involvement were not found to be independent predictors of recurrence. The complication rate was 37% (38/102) in the XRT group and 10% (7/68) in the no-XRT group (p < 0.001). Eight patients (8/102, 8%) required surgical management for complication in the XRT group compared with two patients (2/68, 3%) in the no-XRT group (p=0.10). Higher radiation dose had a modest correlation with increased severity of complication (ρ=0.24; p=0.02). Conclusions: Adjuvant radiation after first-time resection of an ALT of the extremity was associated with a significantly reduced risk of local recurrence but a three-fold increase in complication rate. These data support a 10-year follow-up for these patients and inform a notable clinical trade-off if considering adjuvant radiation for this tumor with recurrent potential.

Patient Reported Quality of Life Outcomes After Definitive Radiation Therapy With Absorbable Spacer Hydrogel for Prostate Cancer.

PURPOSE: SpaceOAR is a device approved for conventional radiation in prostate cancer. We sought to observe prospectively how SpaceOAR Hydrogel effected quality of life and dosimetry to organs at risk at our institution. METHODS AND MATERIALS: We prospectively enrolled patients with low risk or favorable-intermediate risk localized prostate cancer. Baseline Expanded Prostate Cancer Index Composite (EPIC-26) scores along with baseline American Urology Association Symptom Index (AUA-SI) scores were collected. SpaceOAR was placed for all patients who then received stereotactic body radiation therapy, low dose rate brachytherapy, conventionally fractionated radiation therapy, or moderately hypofractionated radiation therapy. We evaluated postimplant dosimetry to critical structures, and prospectively collected follow-up EPIC-26 and AUA-SI scores. We performed a repeated measures analysis of variance to compare patient-specific responses and correlated survey data with dosimetric metrics by generating linear regression models. RESULTS: We enrolled 59 patients in this study with a median follow-up of 366 days (interquartile range, 507). At final follow-up, the "?>prostate-specific antigen had a significant decline compared with baseline (P < .0001). There were no grade 3 toxicities on treatment. There were no significant changes in the AUA-SI score (P = .69) at final follow-up compared with baseline, nor was there any change in EPIC-26 domain scores (P = .19) during the course of the study period. There were no significant associations between AUA scores and EPIC-26 scores and the dose to the rectum, bladder, or urethra with the exception being dose to the 2 mL rectum correlated with decline in EPIC-26 rectal score (ß, -0.002; P = .006). Patient-reported declines in bowel domains were less than previously reported data. CONCLUSIONS: Use of SpaceOAR results in favorable dosimetry to the organs at risk and portends excellent short-term quality of life as measured by the association with the patient reported outcome measures. Longer-term follow-up is ongoing and necessary to assess the long-term effect and association of the hydrogel.

Monte Carlo study on dose distributions from total skin electron irradiation therapy (TSET).

Total skin electron therapy (TSET) has been used to treat mycosis fungoides since the 1950s. Practitioners of TSET rely on relatively crude, phantom-based point measurements for commissioning and treatment plan dosimetry. Using Monte Carlo simulation techniques, this study presents whole-body dosimetry for a patient receiving rotational, dual-field TSET. The Monte Carlo codes, BEAMnrc/DOSXYZnrc, were used to simulate 6 MeV electron beams to calculate skin dose from TSET. Simulations were validated with experimental measurements. The rotational dual-field technique uses extended source-to-surface distance with an acrylic beam degrader between the patient and incident beams. Simulations incorporated patient positioning: standing on a platform that rotates during radiation delivery. Resultant patient doses were analyzed as a function of skin depth-dose coverage and evaluated using dose-volume-histograms. Good agreement was obtained between simulations and measurements. For a cylinder with a 30 cm diameter, the depths that dose fell to 50% of the surface dose was 0.66 cm, 1.15 cm and 1.42 cm for thicknesses of 9 mm, 3 mm and without an acrylic scatter plate, respectively. The results are insensitive to cylinder diameter. Relatively uniform skin surface dose was obtained for skin in the torso area although large dose variations (>25%) were found in other areas resulting from partial beam shielding of the extremities. To achieve 95% mean dose to the first 5 mm of skin depth, the mean dose to skin depth of 5-10 mm and depth of 10-15 mm from the skin surface was 74% (57%) and 50% (25%) of the prescribed dose when using a 3 mm (9 mm) thickness scatter plate, respectively. As a result of this investigation on patient skin dose distributions we changed our patient treatments to use a 3 mm instead of a 9 mm thickness Acrylic scatter plate for clinically preferred skin depth dose coverage.

Unsolicited patient complaints among radiation, medical, and surgical oncologists.

BACKGROUND: Unsolicited patient complaints (UPCs) about physician practices are nonrandomly associated with malpractice claims and clinical quality. The authors evaluated the distributions and types of UPCs associated with oncologists by specialty and assessed oncologist characteristics associated with UPCs. METHODS: This retrospective study reviewed UPCs associated with US radiation oncologists (ROs), medical oncologists (MOs), and surgical oncologists (SOs) from 35 health care systems from 2015 to 2018. Average total UPCs were compared by specialty in addition to sex, medical school graduation year, degree, medical school location, residency location, practice setting, and practice region. For continuous variables, linear regression was used to test for an association with total complaints. RESULTS: The study included 1576 physicians: 318 ROs, 1020 MOs, and 238 SOs. The average number of UPCs per physician was different and depended on the oncologic specialty: ROs had significantly fewer complaints (1.28; 95% confidence interval [CI], 1.02-1.54) than MOs (3.81; 95% CI, 3.52-4.10) and SOs (6.89; 95% CI, 5.99-7.79; P < .0001). In a multivariable analysis, oncologic specialty, recency of graduation, and academic practice were predictive of higher total UPCs (P < .05). UPCs described concerns with care and treatment (42.8%), communication (26.4%), accessibility (17.5%), concern for patient (10.3%), and billing (2.9%). CONCLUSIONS: ROs had significantly fewer complaints than MOs and SOs and may have a lower risk of malpractice claims as a group. In addition to oncologic specialty, a more recent year of medical school graduation and working at an academic center were independent risk factors for UPCs. Further research is needed to clarify the reasons underlying these associations and to identify interventions that decrease UPCs and associated risks. LAY SUMMARY: This study of 1576 oncologists found that radiation oncologists had significantly fewer complaints than medical oncologists, who in turn had significantly fewer complaints than surgical oncologists. Other characteristics associated with more patient complaints included recency of medical school graduation and practice in an academic setting. Oncologists' patient complaints provide information that may have practical applications for patient safety and risk management. Understanding and addressing the characteristics that increase the risk for complaints could improve patients' experiences and outcomes.

Novel Workflow for Conversion of Catheter-Based Electroanatomic Mapping to DICOM Imaging for Noninvasive Radioablation of Ventricular Tachycardia.

PURPOSE: A recent clinical trial has demonstrated that noninvasive radioablation (NIRA) has the potential to reduce recurrent ventricular tachycardia (VT) that is refractory to drugs and standard catheter ablation. Electroanatomic mapping (EAM) that would be useful for planning is obtained during catheter ablation, but incompatibility between EAM and DICOM formats required for radiation planning has impeded the use of existing catheter-based mapping to guide NIRA and is an important hurdle for its wider adoption. In this paper we define a process to facilitate the fusion of catheter-based EAM with DICOM imaging for radiation planning. METHOD AND MATERIALS: The raw data export of the CARTO3 EAM system (version 6.0.45.171, ".mesh" file) was processed with a MATLAB script to generate 3-dimensional (3D) visual took kit files containing X, Y, Z coordinates obtained during mapping and corresponding impedance, voltage, and other point-based information. The image could then be visualized with standard image processing software (3D Slicer) and the target outlined on the image surface. This structure was in turn converted to a DICOM image and fused with patient thoracic imaging using anatomic landmarks. Robustness of the workflow was assessed through implementation with a second magnetic resonance imaging based VT ablation planning system, ADAS-VT. RESULTS: This process facilitated the fusion of EAM and DICOM imaging to inform selection of NIRA targets. The workflow was found to be robust and compatible with a second VT ablation planning system. CONCLUSIONS: The conversion of catheter-based EAM to a DICOM compatible format permits the fusion of images for radiation planning and provides an avenue for the wider application of NIRA. Further improvements in the compatibility of these imaging formats would be expected to improve quality and reproducibility of image fusion.

Inadvertent Inguinal Sarcoma Excision during Hernia Surgery: Outcomes, Gender Analysis, and Prevention.

INTRODUCTION: Inadvertent excision of a soft tissue sarcoma during hernia surgery is a preventable clinical scenario that leads to unnecessary patient morbidity. Prior series are few, which only include male patients with little focus on prevention. The purpose of this study is to report the presenting features and outcomes of both male and female patients who underwent inadvertent inguinal sarcoma excision during hernia surgery. METHODS: A retrospective analysis of a single sarcoma referral center identified 33 patients who were referred for definitive treatment. Patients were divided into three clinically relevant groups based on intraoperative diagnosis, sex, and location of the mass relative to the inguinal ligament. T-tests and Fisher's exact tests were performed to compare continuous and categorical variables, respectively. Kaplan-Meier modeling was performed to assess sarcoma-specific survival. RESULTS: Females were younger (47 years vs. 61 years, p=0.003) and had smaller sarcomas (6.7 cm vs. 11 cm, p=0.012) compared to males. Only two sarcomas (2/33, 6%) were <4 cm in size. The majority of sarcomas in females were above the inguinal ligament (12/14, 86%). Twenty-nine (88%) underwent definitive R0 excision. The mean number of surgeries per patient was three (range 1-13), with nineteen (58%) patients requiring flap reconstruction and six (18%) requiring vascular bypass. Five patients locally recurred (15%) at a mean of 38 months after definitive excision (range 5-128 months). Overall sarcoma-specific disease-free survival was 64%, with no difference between males (80 ± 11%) and females (59 ± 17%) (p=0.885). Mean follow-up was 75 months (range 5-212). CONCLUSION: This is the second largest study regarding inadvertent inguinal sarcoma excision and the first to include females. When a suspected hernia is >4 cm, irreducible, firm, and is growing, especially in females, consider obtaining preoperative advanced three-dimensional imaging (CT or MRI) that can differentiate a neoplasm from a hernia.

Radiotherapy for ablation of ventricular tachycardia: Assessing collateral dosing.

Ablation of cardiac tissue using focused radiotherapy to control ventricular tachycardia (VT) is a novel therapeutic consideration in the management of ventricular arrhythmias associated with structural heart disease. Segments of ventricular myocardium that act as substrates for ventricular tachycardia can be identified by the use of invasive mapping techniques or non-invasive ECG incorporating multi-electrode body surface recordings and cardiac imaging. Early case series have demonstrated a consistent decrease in VT burden and sufficient acute safety to expand to more detailed multicenter studies. As VT substrates can be closely related to critical structures such as the epicardial coronary vessels and the conduction system, the late effects of radiation to these structures is of concern. Modeling radiation dose to these structures has a potentially important role in application of this new technology. This review details the current technique of stereotactic body radiotherapy for control of VT and provides approximated dose calculations to collateral structures when therapy is targeted at the base of the heart.

Consensus and controversies regarding the treatment of rhabdomyosarcoma.

Optimal treatment of rhabdomyosarcoma (RMS) requires multidisciplinary approach, incorporating chemotherapy with local control. Although current therapies are built on cooperative group trials, a comprehensive standard of care to guide clinical decision making has been lacking, especially for relapsed patients. Therefore, we assembled a panel of pediatric and adolescent and young adult sarcoma experts to develop treatment guidelines for managing RMS and to identify areas in which further research is needed. We created algorithms incorporating evidence-based care for patients with RMS, emphasizing the importance of clinical trials and close integration of all specialties involved in the care of these patients.

Disparity in Outcomes for Adolescent and Young Adult Patients Diagnosed With Pediatric Solid Tumors Across 4 Decades.

OBJECTIVE: Cancer mortality is a leading cause of disease-related death in the adolescent and young adult (AYA) population. Compared with older and younger patients, AYA patients often experience worse cancer-specific outcomes. Here, we compare AYA and pediatric overall survival (OS) in the most common pediatric extracranial solid tumors. MATERIALS AND METHODS: Using the US Surveillance, Epidemiology, and End Results database, we studied patients (age, 0 to 39 y) diagnosed with Ewing sarcoma, neuroblastoma, osteosarcoma, rhabdomyosarcoma, and Wilms tumor. RESULTS: A total of 12,375 patients (age, 0 to 39 y) were diagnosed between 1973 and 2010 (8247 pediatric and 4128 AYA patients). AYA patients with rhabdomyosarcoma and Ewing sarcoma were more likely to present with metastatic disease. OS was significantly worse in the AYA cohort for all tumor types (P<0.001) with the exception of osteosarcoma (P=0.29). Across 2 treatment time periods (1973 to 1989 and 1990 to 2010), there was significant improvement in 5-year OS in all tumor types with the exception of rhabdomyosarcoma; however, AYA patients continued to experience worse OS in the modern treatment cohort with the exception of osteosarcoma patients. There was no improvement in OS among AYA patients with Ewing sarcoma, neuroblastoma, rhabdomyosarcoma, or Wilms tumor over the 2 treatment eras. CONCLUSIONS: For the most common pediatric extracranial solid tumors, AYA patients experience significantly worse OS compared with pediatric patients. Although improvements in therapy have led to gain in survival for pediatric patients, with the exception of osteosarcoma, AYA experienced no increase in survival over the study period. This investigation demonstrates the importance for further research in the AYA population.

Utilization of hypofractionated radiotherapy in treatment of glioblastoma multiforme in elderly patients not receiving adjuvant chemoradiotherapy: A National Cancer Database Analysis.

To assess the utilization and outcomes of adjuvant monotherapy with hypofractionated radiation (RT) among elderly patients not receiving traditional adjuvant chemoradiotherapy (cRT) for glioblastoma multiforme (GBM). A retrospective analysis using the National Cancer Data Base with GBM patients aged 65 years or older treated between 2005 and 2012 was conducted. Patients who underwent hypofractionated RT (40 Gy), conventional RT (60 Gy), chemotherapy, or best supportive care alone were included. Statistical methods included logistic regression for utilization and Cox regression for survival analysis. A total of 9556 patients were analyzed. On multivariate analysis (compared to those receiving conventional RT), patients more likely to be treated with hypofractionated RT were older (75-84 years old OR 2.05; p < 0.01 and ≥ 85 years old OR 3.32; p < 0.01), with a Charlson/Deyo score of 2 or higher (OR 1.80; p = 0.05), from communities > 50 miles from their treatment facility (50-100 miles OR 8.03; p < 0.01 and > 100 miles OR 7.16; p < 0.01), treated at an Academic/Research facility (OR 2.85; p = 0.04), and diagnosed between 2011 and 2012 (OR 4.15; p < 0.01). On Cox regression, hypofractionated RT (HR 0.65; p < 0.01), conventional RT (HR 0.60; p < 0.01), and chemotherapy alone (HR 0.69; p < 0.01) were all associated with decreased risk of death compared to no adjuvant therapy. Among patients receiving adjuvant treatment, utilization of hypofractionated RT increased from 7 to 19% during the study period. Among elderly patients with GBM not receiving cRT, the utilization of adjuvant monotherapy with hypofractionated RT has increased over time. Retrospective evidence suggests it may be better than best supportive care alone and as good as conventionally fractionated RT alone.

Central Nervous System Disease, Education, and Race Impact Radiation Refusal in Pediatric Cancer Patients.

To investigate the determinants of radiation therapy refusal in pediatric cancer, we used the Surveillance, Epidemiology, and End Results registry to identify 24,421 patients who met the eligibility criteria, diagnosed between 1974 and 2012. Patients had any stage of cancer, were aged 0 to 19, and received radiation therapy or refused radiation therapy when it was recommended. One hundred twenty-eight patients (0.52%) refused radiation therapy when it was recommended. Thirty-two percent of patients who refused radiation therapy ultimately died from their cancer, at a median of 7 months after diagnosis (95% confidence interval, 3-11 mo), as compared with 29.0% of patients who did not refuse radiation therapy died from their cancer, at a median of 17 months after diagnosis (95% confidence interval, 17-18 mo). On multivariable analysis, central nervous system (CNS) site, education, and race were associated with radiation refusal. The odds ratio for radiation refusal for patients with CNS disease was 1.62 (P=0.009) as compared with patients without CNS disease. For patients living in a county with ≥10% residents having less than ninth grade education, the odds ratio for radiation refusal was 1.71 (P=0.008) as compared with patients living in a county with <10% residents having less than ninth grade education. Asian, Pacific Islander, Alaska Native, and American Indian races had an odds ratio of 2.12 (P=0.002) for radiation refusal as compared with black or white race. Although the radiation refusal rate in the pediatric cancer population is low, we show that CNS site, education level, and race are associated with a significant difference in radiation refusal.

Treatment pathway of bone sarcoma in children, adolescents, and young adults.

When pediatric, adolescent, and young adult patients present with a bone sarcoma, treatment decisions, especially after relapse, are complex and require a multidisciplinary approach. This review presents scenarios commonly encountered in the therapy of bone sarcomas with the goal of objectively presenting a consensus, multidisciplinary management approach. Little variation was found in the authors' group with respect to local control or systemic therapy. Clinical trials were universally prioritized in all settings. Decisions regarding relapse therapies in the absence of a clinical trial had very minor variations initially, but a consensus was reached after a literature review and discussion. This review presents a concise document and figures as a starting point for evidence-based care for patients with these rare diseases. This framework allows prospective decision making and prioritization of clinical trials. It is hoped that this framework will inspire and focus future clinical research and thus lead to new trials to improve efficacy and reduce toxicity. Cancer 2017;123:2206-2218. © 2017 American Cancer Society.

Assessment of the treatment approach and survival outcomes in a modern cohort of patients with atypical teratoid rhabdoid tumors using the National Cancer Database.

BACKGROUND: Atypical teratoid rhabdoid tumors (ATRTs) are rare brain tumors that occur primarily in children under the age of 3 years. This report evaluates the treatment approach and survival outcomes in a large cohort of patients treated in the United States. METHODS: Using the National Cancer Database, the analysis included all ATRT patients aged 0 to 18 years who were diagnosed between 2004 and 2012 and had complete treatment data. RESULTS: Three hundred sixty-one ATRT patients were evaluated. The 5-year overall survival (OS) rate was 29.9%, and it was significantly lower for children who were less than 3 years old (5-year OS, 27.7%) versus those who were 3 years old or older (5-year OS, 37.5%; P < .001). The best outcome was seen for patients with localized disease who received trimodality therapy (surgery, chemotherapy, and radiation therapy [RT]) with a 5-year OS rate of 46.8%. The utilization of trimodality therapy significantly increased during the study period (27.7% in 2004-2008 vs 45.1% in 2009-2012; P < .01), largely because of the increased use of RT. In a multivariate analysis, treatment that did not utilize trimodality therapy was associated with significantly worse OS (hazard ratio, 2.52; 95% confidence interval (1.82-3.51). Children aged 0 to 2 years were significantly less likely to receive trimodality therapy because of decreased utilization of RT in this age group. CONCLUSIONS: The use of trimodality therapy significantly increased during the study period and was associated with improved outcomes. For patients with localized disease who received trimodality therapy, the OS rate at 5 years approached 50%. However, further research into the optimal management of children less than 3 years old is needed because of their significantly worse OS in comparison with older children. Cancer 2017;123:682-687. © 2016 American Cancer Society.

Effects of Race/Ethnicity and Socioeconomic Status on Outcome in Childhood Acute Lymphoblastic Leukemia.

With modern therapy, overall survival (OS) for children with acute lymphoblastic leukemia approaches 90%. However, inferior outcomes for minority children have been reported. Data on the effects of ethnicity/race as it relates to socioeconomic status are limited. Using state cancer registry data from Texas and Florida, we evaluated the impact of neighborhood-level poverty rate and race/ethnicity on OS for 4719 children with acute lymphoblastic leukemia. On multivariable analysis, patients residing in neighborhoods with the highest poverty rate had a 1.8-fold increase in mortality compared with patients residing in neighborhoods with the lowest poverty rate (hazard ratio [HR], 1.8; 95% confidence interval [CI], 1.41-2.30). Hispanic and non-Hispanic black patients also had increased risk of mortality compared with non-Hispanic white patients (Hispanic: HR, 1.18; 95% CI, 1.01-1.39; non-Hispanic black: HR, 1.31; 95% CI, 1.03-1.66). On subgroup analysis, there was a 21.7% difference in 5-year OS when comparing non-Hispanic white children living in the lowest poverty neighborhoods (5-year OS, 91.2%; 95% CI, 88.6-93.2) to non-Hispanic black children living in the highest poverty neighborhoods (5-year OS, 69.5%; 95% CI, 61.5-76.1). To address such disparities in survival, further work is needed to identify barriers to cancer care in this pediatric population.