Combinatorial Approaches for Chemotherapies and Targeted Therapies With Radiation: United Efforts to Innovate in Patient Care.

Combinatorial therapies consisting of radiation therapy (RT) with systemic therapies, particularly chemotherapy and targeted therapies, have moved the needle to augment disease control across nearly all disease sites for locally advanced disease. Evaluating these important combinations to incorporate more potent therapies with RT will aid our understanding of toxicity and efficacy for patients. This article discusses multiple disease sites and includes a compilation of contributions from expert Red Journal editors from each disease site. Leveraging improved systemic control with novel agents, we must continue efforts to study novel treatment combinations with RT.

Insurance Coverage and Forgoing Medical Appointments Because of Cost Among Cancer Survivors After 2016.

PURPOSE: The uninsured rate began rising after 2016, which some have attributed to health policies undermining aspects of the Affordable Care Act. Our primary objectives were to assess the changes in insurance coverage and forgoing medical care because of cost in cancer survivors from pre-enactment (2016) through postenactment of those policies (2019) and determine whether there were subgroups that were disproportionately affected. METHODS: The 2016-2019 Behavioral Risk Factor Surveillance System surveys were queried for 18- to 64-year-old cancer survivors. Survey-weighted logistic regression was used to assess temporal changes in (1) insurance coverage and (2) forgoing medical appointments because of cost in the preceding 12 months. RESULTS: A total of 62,669 cancer survivors were identified. The percentage of insured cancer survivors decreased from 92.4% in 2016 to 90.4% in 2019 (odds ratio for change in insurance coverage or affordability per one-year increase [ORyear], 0.92; 95% CI, 0.86 to 0.98; P = .01), translating to 161,000 fewer cancer survivors in the United States with insurance coverage. There were decreases in employer-sponsored insurance coverage (ORyear, 0.89) but increases in Medicaid coverage (ORyear, 1.17) from 2016 to 2019. Forgoing medical appointments because of cost increased from 17.9% in 2016 to 20.0% in 2019 (ORyear, 1.05; 95% CI, 1.01 to 1.1; P = .025), affecting an estimated 169,000 cancer survivors. The greatest changes were observed among individuals with low income, particularly those residing in nonexpansion states. CONCLUSION: Between 2016 and 2019, there were 161,000 fewer cancer survivors in the United States with insurance coverage, and 169,000 forwent medical care because of cost.

What is appropriate target delineation for MRI-based brachytherapy for medically inoperable endometrial cancer?

PURPOSE: For medically inoperable endometrial cancer (MIEC), the volumetric target of image-guided brachytherapy (IGBT) techniques is not well established. We propose a high-risk CTV (HRCTV) concept and report associated rates of local control and toxicity. METHODS AND MATERIALS: For all MIEC patients receiving definitive external beam radiotherapy (EBRT) followed by MRI-based IGBT at a single institution, BT dose was prescribed to HRCTV defined as GTV plus endometrial cavity with a planning goal of a summed EQD2 D90 of ≥85 Gy. Freedom from local progression (FFLP) and overall survival (OS) were estimated via Kaplan Meier method. RESULTS: Thirty two MIEC patients received EBRT followed by MRI-based IGBT between December 2015 and August 2020. Median follow up was 19.8 months. A total of 75% of patients had FIGO stage I/II disease, 56% endometrioid histology, and 50% grade 3 disease. OS was 73.6% (95% CI 57.8%-89.3%) at 12 months and 65.8% (95% CI 48.4%-83.2%) at 24 months. FFLP was 93.8% (95% CI 85.3%-100%) at 12 months and 88.8% (95% CI 86.6%-91.0%) at 24 months. 23 (72%) patients experienced no RT-related toxicity, while 2 of 32 patients (6%) experienced late grade 3+ toxicities (grade 3 refractory vomiting; grade 5 GI bleed secondary to RT-induced proctitis). CONCLUSIONS: Patients with MIEC receiving definitive EBRT followed by MRI-based IGBT prescribed to the MRI-defined HRCTV demonstrated favorable long-term local control with an acceptable toxicity profile.

The Affordable Care Act and suicide incidence among adults with cancer.

BACKGROUND: Patients with cancer are at an increased suicide risk, and socioeconomic deprivation may further exacerbate that risk. The Affordable Care Act (ACA) expanded insurance coverage options for low-income individuals and mandated coverage of mental health care. Our objective was to quantify associations of the ACA with suicide incidence among patients with cancer. METHODS: We identified US patients with cancer aged 18-74 years diagnosed with cancer from 2011 to 2016 from the Surveillance, Epidemiology, and End Results database. The primary outcome was the 1-year incidence of suicide based on cumulative incidence analyses. Difference-in-differences (DID) analyses compared changes in suicide incidence from 2011-2013 (pre-ACA) to 2014-2016 (post-ACA) in Medicaid expansion relative to non-expansion states. We conducted falsification tests with 65-74-year-old patients with cancer, who are Medicare-eligible and not expected to benefit from ACA provisions. RESULTS: We identified 1,263,717 patients with cancer, 812 of whom died by suicide. In DID analyses, there was no change in suicide incidence after 2014 in Medicaid expansion vs. non-expansion states for nonelderly (18-64 years) patients with cancer (p = .41), but there was a decrease in suicide incidence among young adults (18-39 years) (- 64.36 per 100,000, 95% CI = - 125.96 to - 2.76, p = .041). There were no ACA-associated changes in suicide incidence among 65-74-year-old patients with cancer. CONCLUSIONS: We found an ACA-associated decrease in the incidence of suicide for some nonelderly patients with cancer, particularly young adults in Medicaid expansion vs. non-expansion states. Expanding access to health care may decrease the risk of suicide among cancer survivors.

Catastrophic health expenditures, insurance churn, and nonemployment among gynecologic cancer patients in the United States.

BACKGROUND: In recent years, there has been growing recognition of the financial burden of severe illness, including associations with higher rates of nonemployment, uninsurance, and catastrophic out-of-pocket health spending. Patients with gynecologic cancer often require expensive and prolonged treatments, potentially disrupting employment and insurance coverage access, and putting patients and their families at risk for catastrophic health expenditures. OBJECTIVE: This study aimed to describe the prevalence of insurance churn, nonemployment, and catastrophic health expenditures among nonelderly patients with gynecologic cancer in the United States, to compare within subgroups and to other populations and assess for changes associated with the Affordable Care Act. STUDY DESIGN: We identified respondents aged 18 to 64 years from the Medical Expenditure Panel Survey, 2006 to 2017, who reported care related to gynecologic cancer in a given year, and a propensity-matched cohort of patients without cancer and patients with cancers of other sites, as comparison groups. We applied survey weights to extrapolate to the US population, and we described patterns of insurance churn (any uninsurance or insurance loss or change), catastrophic health expenditures (>10% annual family income), and nonemployment. Characteristics and outcomes between groups were compared with the adjusted Wald test. RESULTS: We identified 683 respondents reporting care related to a gynecologic cancer diagnosis from 2006 to 2017, representing an estimated annual population of 532,400 patients (95% confidence interval, 462,000-502,700). More than 64% of patients reported at least 1 of 3 primary negative outcomes of any uninsurance, part-year nonemployment, and catastrophic health expenditures, with 22.4% reporting at least 2 of 3 outcomes. Catastrophic health spending was uncommon without nonemployment or uninsurance reported during that year (1.2% of the population). Compared with patients with other cancers, patients with gynecologic cancer were younger and more likely with low education and low family income (≤250% federal poverty level). They reported higher annual risks of insurance loss (8.8% vs 4.8%; P=.03), any uninsurance (22.6% vs 14.0%; P=.002), and part-year nonemployment (55.3% vs 44.6%; P=.005) but similar risks of catastrophic spending (12.6% vs 12.2%; P=.84). Patients with gynecologic cancer from low-income families faced a higher risk of catastrophic expenditures than those of higher icomes (24.4% vs 2.9%; P<.001). Among the patients from low-income families, Medicaid coverage was associated with a lower risk of catastrophic spending than private insurance. After the Affordable Care Act implementation, we observed reductions in the risk of uninsurance, but there was no significant change in the risk of catastrophic spending among patients with gynecologic cancer. CONCLUSION: Patients with gynecologic cancer faced high risks of uninsurance, nonemployment, and catastrophic health expenditures, particularly among patients from low-income families. Catastrophic spending was uncommon in the absence of either nonemployment or uninsurance in a given year.

Outcomes in Patients With 4 to 10 Brain Metastases Treated With Dose-Adapted Single-Isocenter Multitarget Stereotactic Radiosurgery: A Prospective Study.

PURPOSE: To examine the effectiveness and safety of single-isocenter multitarget stereotactic radiosurgery using a volume-adapted dosing strategy in patients with 4 to 10 brain metastases. METHODS AND MATERIALS: Adult patients with 4 to 10 brain metastases were eligible for this prospective trial. The primary endpoint was overall survival. Secondary endpoints were local recurrence, distant brain failure, neurologic death, and rate of adverse events. Exploratory objectives were neurocognition, quality of life, dosimetric data, salvage rate, and radionecrosis. Dose was prescribed in a single fraction per RTOG 90-05 or as 5 Gy × 5 fractions for lesions ≥3 cm diameter, lesions involving critical structures, or single-fraction brain V12Gy >20 mL. RESULTS: Forty patients were treated with median age of 61 years, Karnofsky performance status 90, and 6 brain metastases. Twenty-two patients survived longer than expected from the time of protocol SRS, with 1 living patient who has not reached that milestone. Median overall survival was 8.1 months with a 1-year overall survival of 35.7%. The 1-year local recurrence rate was 5% (10 of 204 of evaluable lesions) in 12.5% (4 of 32) of the patients. Distant brain failure was observed in 19 of 32 patients with a 1-year rate of 35.8%. Grade 1-2 headache was the most common complaint, with no grade 3-5 treatment-related adverse events. Radionecrosis was observed in only 5 lesions, with a 1-year rate of 1.5%. Rate of neurologic death was 20%. Neurocognition and quality of life did not significantly change 3 months after SRS compared with pretreatment. CONCLUSIONS: These results suggest that volume-adapted dosing single-isocenter multitarget stereotactic radiosurgery is an effective and safe treatment for patients with 4 to 10 brain metastases.

Associations of Insurance Churn and Catastrophic Health Expenditures With Implementation of the Affordable Care Act Among Nonelderly Patients With Cancer in the United States.

Importance: Health insurance coverage is dynamic in the United States, potentially changing from month to month. The Patient Protection and Affordable Care Act (ACA) aimed to stabilize markets and reduce financial burden, particularly among those with preexisting conditions. Objective: To describe the risks of insurance churn (ie, gain, loss, or change in coverage) and catastrophic health expenditures among nonelderly patients with cancer in the United States, assessing for changes associated with ACA implementation. Design, Setting, and Participants: This retrospective, cross-sectional study uses data from the Medical Expenditure Panel Survey, a representative sample of the US population from 2005 to 2018. Respondents included were younger than 65 years, identified by health care use associated with a cancer diagnosis code in the given year. Statistical analysis was conducted from July 30, 2020, to January 5, 2021. Exposures: The Patient Protection and Affordable Care Act. Main Outcomes and Measures: Survey weights were applied to generate estimates for the US population. Annual risks of insurance churn (ie, any uninsurance or insurance change or loss) and catastrophic health expenditures (spending >10% income) were calculated, comparing subgroups with the adjusted Wald test. Weighted multivariable linear regression was used to assess for changes associated with ACA implementation. Results: From 6069 respondents, we estimated a weighted mean of 4.78 million nonelderly patients (95% CI, 4.55-5.01 million; female patients: weighted mean, 63.9% [95% CI, 62.2%-65.7%]; mean age, 50.3 years [95% CI, 49.7-50.8 years]) with cancer annually in the United States. Patients with cancer experienced lower annual risks of insurance loss (5.3% [95% CI, 4.5%-6.1%] vs 7.6% [95% CI, 7.4%-7.8%]) and any uninsurance (14.6% [95% CI, 13.3%-16.0%] vs 24.1% [95% CI, 23.5%-24.7%]) but increased risk of catastrophic health expenditures (expenses alone: 12.4% [95% CI, 11.2%-13.6%] vs 6.3% [95% CI, 6.2%-6.5%]; including premiums: 26.6% [95% CI, 25.0%-28.1%] vs 16.5% [95% CI, 16.1%-16.8%]; P < .001) relative to the population without cancer. Patients with cancer from low-income families and with full-year private coverage were at particularly high risk of catastrophic health expenditures (including premiums: 81.7% [95% CI, 74.6%-88.9%]). After adjustment, low income was the factor most strongly associated with both insurance churn and catastrophic spending, associated with annual risk increases of 6.5% (95% CI, 4.2%-8.8%) for insurance loss, 17.3% (95% CI, 13.4%-21.2%) for any uninsurance, and 37.4% (95% CI, 33.3%-41.6%) for catastrophic expenditures excluding premiums (P < .001). In adjusted models relative to 2005-2009, full ACA implementation (2014-2018) was associated with a decreased annual risk of any uninsurance (-4.2%; 95% CI, -7.4% to -1.0%; P = .01) and catastrophic spending by expenses alone (-3.0%; 95% CI, -5.3% to -0.8%; P = .008) but not including premiums (0.4%; 95% CI, -2.8% to 4.5%; P = .82). Conclusions and Relevance: In this cross-sectional study, US patients with cancer faced significant annual risks of insurance churn and catastrophic health spending. Despite some improvements with ACA implementation, large burdens remained, and further reform is needed to protect this population from excessive hardship.

Medicaid Expansion Reduced Uninsured Surgical Hospitalizations And Associated Catastrophic Financial Burden.

An important function of health insurance is protecting enrollees from excessively burdensome charges for unanticipated medical events. Unexpected surgery can be financially catastrophic for uninsured people. By targeting the low-income uninsured population, Medicaid expansion had the potential to reduce the financial risks associated with these events. We used two data sources (state-level data for forty-four states and patient-level data for four states) to estimate the association of Medicaid expansion with uninsured surgical hospitalizations among nonelderly adults. Uninsured surgery cases were typically admitted through the emergency department-often for common emergency procedures-and 99 percent of them were estimated to be associated with financially catastrophic visit charges. We found that Medicaid expansion was associated with reductions in both the share (6.20 percent) and the population rate (7.85 per 10,000) of uninsured surgical discharges in expansion versus nonexpansion states. Our estimates suggest that in 2019 alone, adoption of Medicaid expansion in nonexpansion states could have prevented more than 50,000 incidences of catastrophic financial burden resulting from uninsured surgery.

The impact of the Patient Protection and Affordable Care Act on insurance coverage and cancer-directed treatment in HIV-infected patients with cancer in the United States.

BACKGROUND: To the authors' knowledge, little is known regarding the impact of the Patient Protection and Affordable Care Act (ACA) on people living with HIV and cancer (PLWHC), who have lower cancer treatment rates and worse cancer outcomes. To investigate this research gap, the authors examined the effects of the ACA on insurance coverage and receipt of cancer treatment among PLWHC in the United States. METHODS: HIV-infected individuals aged 18 to 64 years old with cancer diagnosed between 2011 and 2015 were identified in the National Cancer Data Base. Health insurance coverage and cancer treatment receipt were compared before and after implementation of the ACA in non-Medicaid expansion and Medicaid expansion states using difference-in-differences analysis. RESULTS: Of the 4794 PLWHC analyzed, approximately 49% resided in nonexpansion states and were more often uninsured (16.7% vs 4.2%), nonwhite (65.2% vs 60.2%), and of low income (36.3% vs 26.9%) compared with those in Medicaid expansion states. After 2014, the percentage of uninsured individuals decreased in expansion states (from 4.9% to 3%; P = .01) and nonexpansion states (from 17.6% to 14.6%; P = .06), possibly due to increased Medicaid coverage in expansion states (from 36.9% to 39.2%) and increased private insurance coverage in nonexpansion states (from 29.5% to 34.7%). There was no significant difference in cancer treatment receipt noted between Medicaid expansion and nonexpansion states. However, the percentage of PLWHC treated at academic facilities increased significantly only in expansion states (from 40.2% to 46.7% [P < .0001]; difference-in-differences analysis: 7.2 percentage points [P = .02]). CONCLUSIONS: The implementation of the ACA was associated with improved insurance coverage among PLWHC. Lack of insurance still is common in non-Medicaid expansion states. Patients with minority or low socioeconomic status more often resided in nonexpansion states, thereby highlighting the need for further insurance expansion.

Off-study utilization of experimental therapies: Analysis of GOG249-eligible cohorts using real world data.

OBJECTIVE: Adjuvant management of women with high-intermediate- and high-risk early-stage endometrial cancer remains controversial. Recently published results of GOG 249 revealed that vaginal brachytherapy plus chemotherapy (VBT + CT) was not superior to whole pelvic radiation therapy (WPRT) and was associated with more toxicities and higher nodal recurrences. This study examined off-study utilization of VBT + CT among women who met criteria for GOG 249 in the period prior to study publication. METHODS: Women diagnosed with FIGO IA-IIB endometrioid, serous, or clear cell uterine cancer between 2004-2015 and treated with hysterectomy and radiotherapy (RT) were identified in the National Cancer Database. Cochrane-Armitrage trend test was used to assess trends over time. Univariate and multivariate Cox analyses were performed to calculate odds ratio (OR) of VBT + CT receipt and hazard ratio (HR) of OS. Propensity-score matched analysis was conducted to account for baseline differences. RESULTS: 9956 women met inclusion criteria. 7548 women (75.8%) received WPRT while 2408 (24.2%) received VBT + CT in the study period. From 2004-2015, there was a significant increase in VBT + CT use (p < 0.001) with the largest overall increase occurring in 2009 to 22%. Factors significantly associated with VBT + CT receipt included higher socioeconomic status (p < 0.001), higher grade endometrioid cancer (p < 0.001), and aggressive histology (p < 0.001). After propensity-score matching, VBT + CT was associated with improved OS (HR 0.74, 95% CI 0.58-0.93); however, when stratified by FIGO stage, VBT + CT was only associated with improved OS for FIGO stage 1B (HR 0.62, 95% CI 0.44-0.87). CONCLUSIONS: There was significant use of experimental arm off-study treatment in the United States prior to report of GOG 249 results. Providers should be cautious when offering off-study treatment utilizing an experimental regimen given uncertainty about efficacy and toxicity.

Place of death by region and urbanization among gynecologic cancer patients: 2006-2016.

OBJECTIVE: To evaluate associations between US region of residence and urbanization and the place of death among women with gynecologic malignancies in the United States. METHODS: A retrospective cross-sectional study was performed using publicly available death certificate data from the National Center for Health Statistics. All gynecologic cancer deaths were included from 2006 to 2016. Comparisons among categories were performed with a two-tailed chi-square test, with p-values <0.05 considered significant. RESULTS: From 2006 to 2016, 328,026 women died from gynecologic malignancies in the US. Of these deaths, 40.1% (n = 134,333) occurred in the patient's home, 24.9%(n = 81,823) in the hospital, and 11.3% (37,188) in an inpatient hospice facility. Place of death varied by geographic region. The Northeast had the largest percentage of gynecologic cancer patients (31.3%) die as a hospital inpatient. The West had the highest percentage of deaths (49.3%) at home. Deaths in a hospice facility were the highest (14.1%) in the South. Place of death varied by urbanization; patients residing in large central metro or rural counties were the most likely to die during hospital admission (28.7% and 27.1%, respectively). Patients living in medium-sized metro areas were the least likely to die in hospitals (21.8%) and most likely to die in a hospice facility (14.3%). All comparisons were significant by study definition. CONCLUSION: The place of death for patients with gynecologic malignancies varies by US region and urbanization. These disparities are multifactorial in nature, likely influenced by both sociodemographic factors and regional resource availability. In this study, however, rural and central metro areas are identified as regions that may benefit from further hospice development and advocacy.

Changes on Midchemoradiation Therapy Fluorodeoxyglucose Positron Emission Tomography for Cervical Cancer Are Associated with Prognosis.

PURPOSE: To assess whether radiographic and metabolic changes on midchemoradiation therapy (CRT) fluorodeoxyglucose positron emission tomography and computed tomography (FDG-PET/CT) for cervical cancer predict outcome. METHODS AND MATERIALS: Women with International Federation of Gynecology and Obstetrics stage IB1-IVB cervical cancer treated with concurrent cisplatin-based CRT and brachytherapy were enrolled on a single-institution prospective clinical trial; FDG-PET/CT was obtained before CRT and at 30 to 36 Gy. Max and mean standard uptake values, metabolic tumor volume, and total lesion glycolysis (TLG) for the primary tumor and clinically involved lymph nodes from the pre-CRT and intra-CRT FDG-PET/CT were recorded. Clinical endpoints analyzed include overall survival (OS), disease-free survival (DFS), and rates of cervical recurrence (CR), nodal recurrence (NR), and distant metastasis (DM). FDG-PET/CT variables and other prognostic factors associated with clinical endpoints were identified via univariate Cox proportional hazards modeling and competing risk analysis. RESULTS: Thirty women were enrolled from 2012 to 2016. After a median follow-up of 24 months, 2-year rates of OS, DFS, DM, NR, and CR were 68% (95% confidence interval [CI], 51%-85%), 44% (95% CI, 26%-63%), 42% (95% CI, 23%-59%), 14% (95% CI, 4%-30%), and 10% (95% CI, 2%-24%), respectively. Intra-PET metrics and TLG across all PET scans were most consistently associated with OS, DFS, DM, and NR on univariate analysis. Intra-CRT TLG was associated with OS (hazard ratio [HR] 1.35; 95% CI, 1.15-1.55; P = .001), DFS (HR 1.19; 95% CI, 1.04-1.34; P = .018), and NR (HR 1.25; 95% CI, 1.10-1.40; P = .002). No absolute or relative changes between parameters of baseline and mid-CRT FDG-PET/CT were associated with disease outcomes on univariate analysis, with the exception of relative change in mean standard uptake values and CR (P = .004). CONCLUSIONS: In this group of patients with high-risk cervical cancer treated with CRT and brachytherapy, TLG and metabolic tumor volume on intra-CRT FDG-PET/CT was associated with OS. These metrics may provide an early signal for selective treatment intensification with either dose escalation or adjuvant chemotherapy.

Radiation Records in the National Cancer Database: Variations in Coding and/or Practice Can Significantly Alter Survival Results.

PURPOSE: The aim of the current work was to quantify internally inconsistent and anomalous radiation therapy (RT) data in the National Cancer Database (NCDB) and determine their association with overall survival (OS) using node-positive uterine cancer as a test clinical scenario. MATERIALS AND METHODS: We identified all NCDB participants with International Federation of Gynecology and Obstetrics stage IIIC1 to IIIC2 uterine cancer treated with hysterectomy and adjuvant RT between 1998 and 2012. Variables that were reviewed to identify anomalous data included RT site, modality, dose, fractions, timing, duration, and stage. We used χ2 testing to associate anomalous data with reporting facility and demographic variables. OS was estimated using the Kaplan-Meier method and comparison between cohorts was performed using the log-rank test. Univariable and multivariable Cox proportional hazards regression analyses were performed. RESULTS: Of the 14,298 analyzed participants, 2,288 (16.0%) had one or more anomalous data entry, 538 (3.8%) likely because of an incomplete RT course. χ2 testing suggested differences in anomalous data prevalence by reporting facility type (P = .0007), geographic region (P < .001), distance from participants' homes (P < .001), diagnosis year (P < .001), and location of RT relative to reporting facility (P = .0038). Five-year OS in those with one or more anomalous data entry was 51.3% versus 58.0% for those without anomalous data (P < .001), and anomalous data remained significantly associated with OS on multivariable analysis. After excluding insufficient, excessive, or unknown total RT dose, anomalous data were no longer significant on multivariable analysis. CONCLUSION: The overwhelming majority of RT data within the NCDB seem to be appropriate for the clinical scenario. Nevertheless, approximately one eighth of participants in this test clinical scenario had adjuvant RT data that were internally inconsistent or outside generously defined norms. The presence of anomalous RT data was significantly associated with compromised OS, an effect not observed after correcting for total RT dose.

Changes in insurance coverage for cancer patients receiving brachytherapy before and after enactment of the Affordable Care Act.

PURPOSE: The Patient Protection and Affordable Care Act called for expansion of Medicaid in 2014. As some states elected to expand Medicaid and others did not, the goal of this study was to determine the effect of Medicaid expansion on the insurance status at cancer diagnosis of brachytherapy patients. METHODS AND MATERIALS: Patients aged 19-64 years with breast, cervical, uterine, or prostate cancer treated with brachytherapy from 2011 to 2014 with known insurance status were identified within the Surveillance, Epidemiology, and End Results registry. Fisher's exact test was used to test for associations of insurance status with expanded versus nonexpanded states. For multivariate analysis, a binomial logistic regression was performed, dichotomized to uninsured versus any insurance. RESULTS: Fifteen thousand four hundred ninety-seven subjects met entry criteria. In the entire cohort, rates of uninsurance were higher in nonexpanded states at baseline (4.5% vs. 2.9%, p < 0.00001). With selective Medicaid expansion in 2014, expanded states had a reduction in uninsurance rates (2.9-1.8%, p = 0.026), whereas nonexpanded states had a nonsignificant increase in uninsurance (4.5-5.0%, p = 0.371). There was a reduction in uninsurance in expanded states in areas of highest poverty (2.9-1.1%, p = 0.0004) not seen in nonexpanded states. These associations remained significant on multivariate analysis (OR 2.2, 95% CI 1.8-2.8, p < 0.00001). CONCLUSIONS: Patients who received brachytherapy were less likely to be uninsured in states where Medicaid was expanded, particularly evident in regions with highest poverty levels. These results should help inform policy decisions and efforts to ensure that all patients have access to high quality treatments, such as brachytherapy.