Association of Neighborhood Opportunity With Severity of Retinoblastoma at Presentation.

PURPOSE: To examine the relationship between the Child Opportunity Index (COI) and severity of retinoblastoma at presentation. DESIGN: Cross-sectional study. METHODS: Children (age <18 years) treated for retinoblastoma at a tertiary care center between January 2000 and May 2023 were included. Residential census tract was used to determine the overall and domain-specific COI score for each child. Collected variables included age, sex, race/ethnicity, insurance type, and the International Classification of Retinoblastoma (ICRB) Group at initial examination. The primary outcome was Group D or E retinoblastoma at presentation. Mixed effects regression models were used to estimate the association of COI scores with disease severity at presentation. RESULTS: This study included 125 children (51.2% male). Median age at diagnosis was 13 months (IQR, 5-24 months). One hundred nine (87.2%) children presented with Group D or E retinoblastoma and 33 (26.4%) resided in low or very low opportunity neighborhoods. Children residing in neighborhoods with low overall COI scores (OR, 1.62; 95% CI, 1.01-2.58; P = .044) and low education COI scores (OR, 1.77; 95% CI, 1.13-2.79; P = .013) were at increased odds of presenting with ICRB Group D or E retinoblastoma after adjusting for individual-level socioeconomic factors. CONCLUSION: Children residing in low opportunity neighborhoods-particularly low education opportunity-more often presented with advanced stage retinoblastoma than children residing in neighborhoods with higher opportunity scores. Efforts to improve preventative vision care and access to eye specialty care for children residing in low-resource areas are needed to reduce existing disparities in retinoblastoma.

Significance of Social Determinants of Health in Tumor Presentation, Hospital Readmission, and Overall Survival in Ocular Oncology.

PURPOSE: To evaluate the association between social determinants of health (SDH) with presentation and outcomes in patients with ocular cancer. METHODS: The National Cancer Database was queried for primary clinical tumor (cT) classifications of T1 to T4 N0M0 uveal melanoma, conjunctival melanoma, or retinoblastoma diagnosed between January 2006 and December 2017. Pearson χ2 analysis assessed differences in SDH-related characteristics between cancer cohorts. Binary logistic regression with adjusted odds ratios (aORs) and multivariate Cox proportional hazards ratios (HRs) with 95% confidence intervals (CIs) were performed. DESIGN: Cross-sectional with a nationally representative sample. RESULTS: Three thousand nine hundred sixty-eight uveal melanoma cases, 352 conjunctival melanoma cases, and 480 retinoblastoma cases were included. Differences in race, primary payer status, income quartile, population density, facility location, Charlson-Deyo comorbidity score, history of malignancy, cT classification at presentation, surgical treatment, radiotherapy, chemotherapy, 30-day readmission, and overall survival (OS) were observed among the cancers. Female sex (aOR 0.819 [95% CI 0.689-0.973]) and top income quartile (aOR 0.691 [95% CI 0.525-0.908]) had decreased likelihood of advanced cT classification at presentation. No insurance (aOR 1.736 [95% CI 1.159-2.601]) and Medicaid primary payer status (aOR 1.875 [95% CI 1.323-2.656]) had increased likelihood of advanced cT classification. Patients in rural areas (aOR 7.157 [95% CI 1.875-27.320]) were more likely to be readmitted within 30 days after initial treatment. Increased age was associated with decreased 5-year OS (HR 1.040 [95% CI 1.033-1.047]). CONCLUSIONS: SDH may influence advanced cT classification at presentation and 30-day readmission compared with OS in patients with ocular cancer, highlighting the need for ophthalmologists and public health efforts to address disparities in SDH.

Retinoblastoma Outcomes in the Americas: A Prospective Analysis of 491 Children With Retinoblastoma From 23 American Countries.

PURPOSE: Globally, disparities exist in retinoblastoma treatment outcomes between high- and low-income countries, but independent analysis of American countries is lacking. We report outcomes of American retinoblastoma patients and explore factors associated with survival and globe salvage. DESIGN: Subanalysis of prospective cohort study data. METHODS: Multicenter analysis at 57 American treatment centers in 23 countries of varying economic levels (low income [LIC], lower-middle income [LMIC], upper-middle income [UMIC], and high income [HIC]) of 491 treatment-naïve retinoblastoma patients diagnosed in 2017 and followed through 2020. Survival and globe salvage rates analyzed with Kaplan-Meier analysis and Cox proportional hazard models. RESULTS: Of patients, 8 (1.6%), 58 (11.8%), 235 (47.9%), and 190 (38.7%) were from LIC, LMIC, UMIC, and HIC groups, respectively. Three-year survival rates in LICs were 60.0% (95% confidence interval [CI] 12.6-88.2) compared with 99.2% (95% CI 94.6%-99.9%) in HICs. Death was less likely in patients >4 years of age (vs ≤4 years, HR = 0.45 [95% CI 0.27-0.78], P = .048). Patients with more advanced tumors (eg, cT3 vs cT1, HR = 4.65 × 109 [95% CI 1.25 × 109-1.72 × 1010], P < .001) and females (vs males, HR = 1.98 [95% CI 1.27-3.10], P = .04) were more likely to die. Three-year globe salvage rates were 13.3% (95% CI 5.1%-25.6%) in LMICs and 46.2% (95% CI 38.8%-53.3%) in HICs. At 3 years, 70.1% of cT1 eyes (95% CI 54.5%-81.2%) vs 8.9% of cT3 eyes (95% CI 5.5%-13.3%) were salvaged. Advanced tumor stage was associated with higher enucleation risk (eg, cT3 vs cT1, subhazard ratio = 4.98 [95% CI 2.36-10.5], P < .001). CONCLUSIONS: Disparities exist in survival and globe salvage in American countries based on economic level and tumor stage demonstrating a need for childhood cancer programs.

Health Services Needs Assessment for Retinoblastoma in Ethiopia.

PURPOSE: The aim of this study was to document the available resources and needs for the detection, diagnosis, and treatment of retinoblastoma (RB) in Ethiopia. METHODS: A health services needs assessment focused on RB care in Ethiopia was conducted. Information was obtained through a web-based survey and field visits. Facilities offering RB service delivery were categorized into three tiers, on the basis of the ability to detect (tier 1) and manage simple (tier 2) or complex (tier 3) patients with RB. Descriptive statistics were performed to quantify human and material resources available at each facility. RESULTS: The web survey received 29 responses from ophthalmologists at 19 health care facilities. Of the 19 units surveyed, seven (36.8%) had an ophthalmologist dedicated to RB treatment, classifying them as either a tier 2 or 3 facility. All tier 3 facilities had an affiliated health facility offering access to off-site pediatric oncology and pathology services. Of the focal therapies offered at tier 3 facilities, none included local chemotherapy or brachytherapy. Enucleation was offered at all tier 2 facilities, but availability of orbital implants and ocular prostheses was variable. None of the health facilities offered genetics services. CONCLUSION: This study demonstrated that the human and material resources needed for RB care in Ethiopia are constrained. Tier 3 RB facilities are rare and concentrated in urban areas, which could make it difficult for many patients to access. With focused capacity-building efforts, it is possible to increase the efficiency of RB therapy.

Assessment of Social Vulnerability in Pediatric Head and Neck Cancer Care and Prognosis in the United States.

Importance: Prior investigations in social determinants of health (SDoH) in pediatric head and neck cancer (HNC) have only considered a narrow scope of HNCs, SDoH, and geography while lacking inquiry into the interrelational association of SDoH with disparities in clinical pediatric HNC. Objectives: To evaluate the association of SDoH with disparities in HNC among children and adolescents and to assess which specific aspects of SDoH are most associated with disparities in dynamic and regional sociodemographic contexts. Design, Setting, and Participants: This retrospective cohort study included data about patients (aged ≤19 years) with pediatric HNC who were diagnosed from 1975 to 2017 from the Surveillance, Epidemiology, and End Results Program (SEER) database. Data were analyzed from October 2021 to October 2022. Exposures: Overall social vulnerability and its subcomponent contributions from 15 SDoH variables, grouped into socioeconomic status (SES; poverty, unemployment, income level, and high school diploma status), minority and language status (ML; minoritized racial and ethnic group and proficiency with English), household composition (HH; household members aged ≥65 and ≤17 years, disability status, single-parent status), and housing and transportation (HT; multiunit structure, mobile homes, crowding, no vehicle, group quarters). These were ranked and scored across all US counties. Main Outcomes and Measures: Regression trends were performed in continuous measures of surveillance and survival period and in discrete measures of advanced staging and surgery receipt. Results: A total of 37 043 patients (20 729 [55.9%] aged 10-19 years; 18 603 [50.2%] male patients; 22 430 [60.6%] White patients) with 30 different HNCs in SEER had significant relative decreases in the surveillance period, ranging from 23.9% for malignant melanomas (mean [SD] duration, lowest vs highest vulnerability: 170 [128] months to 129 [88] months) to 41.9% for non-Hodgkin lymphomas (mean [SD] duration, lowest vs highest vulnerability: 216 [142] months vs 127 [94] months). SES followed by ML and HT vulnerabilities were associated with these overall trends per relative-difference magnitudes (eg, SES for ependymomas and choroid plexus tumors: mean [SD] duration, lowest vs highest vulnerability: 114 [113] months vs 86 [84] months; P < .001). Differences in mean survival time were observed with increasing social vulnerability, ranging from 11.3% for ependymomas and choroid plexus tumors (mean [SD] survival, lowest vs highest vulnerability: 46 [46] months to 41 [48] months; P = .43) to 61.4% for gliomas not otherwise specified (NOS) (mean [SD] survival, lowest vs highest vulnerability: 44 [84] months to 17 [28] months; P < .001), with ML vulnerability followed by SES, HH, and HT being significantly associated with decreased survival (eg, ML for gliomas NOS: mean [SD] survival, lowest vs highest vulnerability: 42 [84] months vs 19 [35] months; P < .001). Increased odds of advanced staging with non-Hodgkin lymphoma (OR, 1.21; 95% CI, 1.02-1.45) and retinoblastomas (OR, 1.31; 95% CI, 1.14-1.50) and decreased odds of surgery receipt for melanomas (OR, 0.79; 95% CI, 0.69-0.91) and rhabdomyosarcomas (OR, 0.90; 95% CI, 0.83-0.98) were associated with increasing overall social vulnerability. Conclusions and Relevance: In this cohort study of patients with pediatric HNC, significant decreases in receipt of care and survival time were observed with increasing SDoH vulnerability.

Aqueous Humor-Derived MYD88 L265P Mutation Analysis in Vitreoretinal Lymphoma: A Potential Less Invasive Method for Diagnosis and Treatment Response Assessment.

PURPOSE: To investigate whether MYD88 L265P mutation, which is frequently present in vitreoretinal lymphoma, can be detected in aqueous humor, a specimen that can be obtained in a clinic setting, potentially mitigating the need for more invasive vitrectomy procedures, and whether this approach can be used to monitor treatment response. DESIGN: Observational case series. SUBJECTS: Patients who were diagnosed with biopsy-confirmed or clinically diagnosed vitreoretinal lymphoma or biopsy-confirmed vitritis. METHODS: We evaluated aqueous humor-derived (AHD) MYD88 L265P mutation during vitreous biopsy or at the initial presentation in the clinic if vitreous biopsy was not feasible. Demographic or clinical features of patients were retrospectively reviewed. Aqueous humor-derived MYD88 L265P mutation was re-evaluated after patients completed a course of intravitreal methotrexate and rituximab injection therapy. The NM_002468.4: c.794T>C (p.L265P) mutation in the MYD88 gene was evaluated in AHD cellular and cell-free DNA using allele-specific polymerase chain reaction. MAIN OUTCOME MEASURES: Detection of AHD MYD88 L265P mutation at the initial diagnosis and to monitor the treatment response. RESULTS: Aqueous humor from 18 eyes of 14 patients with biopsy-confirmed or clinically diagnosed vitreoretinal lymphoma and 3 eyes of 3 patients with biopsy-confirmed vitritis were evaluated. Aqueous humor-derived MYD88 L265P mutation was detected in cell-based and cell-free DNA from 15 (83%) of 18 eyes with biopsy-confirmed or clinically diagnosed vitreoretinal lymphoma but not identified in any of the 3 eyes with vitritis. The mutation was less readily detectable in cellular DNA (10 of 18) compared with cell-free DNA (15 of 18). Furthermore, aqueous sampling after intravitreal methotrexate and rituximab injection therapy revealed absence of this mutation after complete response in 7 eyes. The mutation was detected in 1 eye that developed recurrence in a posttreatment window of 6 months. After a mean of follow-up of 9 months, there was no clinical evidence of vitreoretinal lymphoma recurrence in the 7 eyes with no detectable AHD MYD88 L265P mutation. CONCLUSIONS: This investigational study suggests that AHD MYD88 L265P can be detected in eyes with lymphoma and may thus serve as a surrogate, less invasive biopsy in the diagnosis and follow-up of vitreoretinal lymphoma, particularly when cell-free DNA is evaluated.

Retinoblastoma: emerging concepts in genetics, global disease burden, chemotherapy outcomes, and psychological impact.

In this review we discuss several recent concepts regarding retinoblastoma control and its impact. In a cohort of 482 patients with solitary unilateral retinoblastoma revealed germline mutation in 16% and the likelihood of germline retinoblastoma was greater for younger children (≤1 year versus (vs.) >1 year at presentation) with odds ratio (OR) 2.96 (p = 0.001), and greatest for the youngest infants (≤3 months vs. >3-12 months) (OR 5.52) (p = 0.002). Retinocytoma/retinoma, a benign variant of retinoblastoma, was studied in 78 tumours and demonstrated transformation into retinoblastoma in 9.2% by 5 years and 15.3% by 10 years and 20 years. An international global study on retinoblastoma over 1.5 years revealed 4351 new patients and 85% from low- and middle-income countries, notably with older age at detection and greater risk for metastasis. Management of retinoblastoma in 964 eyes using intravenous chemotherapy showed 20-year globe salvage at 96% in group A, 90% in group B, 90% in group C, 68% in group D, and 32% in group E eyes. The 5-year globe salvage with intra-arterial chemotherapy for 160 eyes (655 infusions) with retinoblastoma showed success in 100% for group B, 80% for group C, 78% for group D, and 55% for group E. The psychological impact of retinoblastoma on the parents revealed depression (73%), anxiety (64%), and/or stress (100%), and on the patient revealed deficits in quality of life issues. Retinoblastoma is a challenging disease and chemotherapy provides reliable tumour control and globe salvage. Continuing efforts to improve quality of life issues is important.

Assessment of Retinal Changes Following Intravitreal Aflibercept in 2 Patients With Von Hippel-Lindau Disease-Related Retinal Capillary Hemangioblastoma.

This case report of 2 patients describes peripheral Von Hippel-Lindau disease associated with a series of aflibercept injections.

Measured, calculated, and egs_brachy I-125 dose distributions in a gold plaque for retinoblastoma treatment.

BACKGROUND: This study measured and calculated dose distributions around a unique gold plaque for whole-eye radiotherapy (to treat retinoblastoma). The applicator consists of a pericorneal ring attached to the four extraocular muscles and four legs, each loaded with I-125 seeds. They are inserted beneath the conjunctiva in-between each pair of muscles and attached anteriorly to the ring. The applicator was designed in such a way that the dose is directed toward the middle of the eye while sparing surrounding tissues. PURPOSE: (I) To compare the measured and calculated data obtained by thermoluminescent dosimeters (TLDs) in a solid-water phantom, a Gafchromic film in a solid-water phantom, the treatment planning systems, and Monte Carlo simulations; (II) to use Monte Carlo simulations for the determination of the dose to the organs at risk by taking the gold shielding and the anisotropy into account. METHODS: The dose around the applicator was measured using TLDs and Gafchromic EBT2 film in eye-shaped solid-water phantoms. Dose calculations were performed with the TheraPlan Plus and BrachyVision planning system and Monte Carlo simulations with egs_brachy code. A computer-aided design drawing of the applicator was created and used to create the input file for the Monte Carlo simulations. RESULTS: Monte Carlo calculated dose to the optic nerve is 64.8% of the central dose in the eye, whereas the planned dose is 93.7%. The Monte Carlo lens dose varies from 72.0% to 86.1%, whereas the planned dose varies from 73.0% to 84.3%. Monte Carlo-calculated dose to the bony orbit is 11.3%, whereas the planned dose is as high as 54.7% compared to the dose in the center region of the eye. CONCLUSIONS: The measured and Monte Carlo-simulated dose distributions matched well, whereas planned dose distributions showed discrepancies in some areas of the eye and outside of the eye due to their ignorance of the shielding effects of the plaque.

Monte Carlo simulation of tilted contact plaque brachytherapy placement for juxtapapillary retinoblastoma.

BACKGROUND: The 106-Ruthenium contact plaque applicator is utilized for the treatment of intraocular tumor within a thickness of less than 6 mm. If anything obstructs the placement of the plaque applicator, the treatment is generally difficult because the applicator has to be temporarily located just on the opposite side of the retinal tumor. Furthermore, the plaque applicator edge of approximately 1 mm does not contain 106Ru, estimating the delivered radiation dose for eccentric tumor is challenging because the lateral dose profile is inadequately provided by the manufacture's certification. This study aims to simulate tumor coverage of the tilted applicator placement for treating an infant with juxtapapillary retinoblastoma and to achieve the effective treatment. CASE PRESENTATION: We present an infant with retinoblastoma whose tumor involved macular and was invading just temporal side of the optic disc. Additionally, posterior staphyloma was induced by a series of previous treatments, making it more difficult to treat the standard plaque placement. Thus, the applicator type of CCA was intentionally tilted to the eyeball and the distance between the posterior edge of the applicator and the eyeball had to be then equal to or more than 2 mm based on the dose distribution of the applicator calculated using Monte Carlo simulation to minimize damage to surrounding tissues while covering the tumor. It was then comparable to the certification and previous reports. Based on the acquired dose distribution, the optimal placement of the applicator was derived from varying the distance between the applicator's edge and the eyeball, and the distance was then determined to be 2 mm. In this case, the minimum dose rate in the tumor was 25.5 mGy/min, and the time required to deliver the prescribed dose was 26.2 h. Therefore, the tilted 106Ru plaque applicator placement could deliver the required dose for the treatment. The physical examination revealed no active tumor as a result of the treatment. CONCLUSIONS: Optimizing the placement of the 106Ru plaque applicator, it was possible to guarantee that the prescribed dose will be delivered to the tumor even if the standard placement is not possible for the juxtapapillary tumor.

Retinoblastoma in twins: Risk assessment of genotypic variants.

Purpose: To describe methods of risk assessment in twins with retinoblastoma (RB). Methods: A case series of four RB probands with a twin sibling. Family status, clinical presentation, and RB1 germline status-based risk assessment were analyzed. Results: Two pairs had a positive family history (unilateral and bilateral RB in one of the parents (#1 and #2, respectively) and two pairs (#3 and #4) were sporadic. One of the familial twins (#1) had a high risk (90%) of manifesting RB in the twin. The other case (#2) with an absent RB1 germline mutation in the twin had a 0% risk of developing RB. Among sporadic cases of twins (#3), genetic testing did not identify a germline mutation (tumor sample unavailable) in the proband which downgraded the risk of germline mutation from 15% to <1%. The twin never developed RB (5 years of age at last follow-up). Pathogenic mosaicism for germline RB1 mutation (c.1723C>T) could be identified (tumor tissue available) in the proband (# 4). Identical germline mutation (and RB tumor) was also noted in the twin. In each case, there was concordance between the assessed risk and manifestation of RB. Conclusion: Assessment of risk of RB in a twin presents with a unique challenge. Depending upon the genotype variant, the risk of developing RB can vary from 0% to 90%. In addition to family history, clinical manifestation in the proband, zygosity status, and RB1 germline status are critical in formulating risk-appropriate surveillance guidelines.

Super-selective intra-arterial platinum-based chemotherapy concurrent with low-dose-rate plaque brachytherapy in the treatment of retinoblastoma: A simulation study.

OBJECTIVE: Retinoblastoma is the most common cancer among children under 5 years of age. The common conventional methods for the treatment of retinoblastoma include chemotherapy and brachytherapy (BT). This study investigated the concurrent use of BT with 125I and 103Pd sources and chemotherapy with platinum-based chemotherapy drugs for retinoblastoma. MATERIALS AND METHODS: The absorbed doses in different parts of the eye were measured with and without platinum. Platinum concentrations of 5, 7.5, 10, and 15 mg/g were evaluated, and the dose enhancement factors (DEFs) were calculated for different cases. RESULTS: For the 125I source, the DEFs at the tumor apex were 1.49, 1.67, 1.81, and 1.97 at concentrations of 5, 7.5, 10, and 15 mg/g, respectively. The DEF decreased dramatically beyond the apex at 0.85 cm from tumor base and was 0.87, 0.82, 0.76, and 0.63 for the abovementioned concentrations, respectively. For the 103Pd source, the DEFs were 1.15, 1.24, 1.21, and 1.07, respectively, at the apex and 0.76, 0.65, 0.56, and 0.39, respectively, beyond the apex. CONCLUSIONS: Our results showed that the concurrent use of low-dose-rate plaque BT and platinum-based chemotherapy significantly increased the tumor-absorbed dose and decreased the absorbed dose in areas outside the tumor and the treatment time.

Socioeconomic status and retinoblastoma survival: Experience of a tertiary cancer center in Brazil.

BACKGROUND: Little is known about socioeconomic status (SES) and its effects in childhood cancer survival. This study aims to discuss the association between SES and survival of patients with retinoblastoma (RB) from a tertiary treatment center. PROCEDURE: A retrospective cohort study was conducted, including all patients with RB referred to the Brazilian National Institute of Cancer in Rio de Janeiro (January 2000-December 2016). RESULTS: Data from 160 patients were analyzed with mean age at diagnosis of 22.85 months (SD ± 14.29). Eighty-three patients (51.9%) had an interval to diagnosis equal to or longer than six months, and 13 children (8.1%) abandoned treatment. Five-year overall survival rate for all patients was 78.8% (95% CI, 72.4%-85.9%). In a multivariate model, patients whose fathers had more than nine years of study had a lower death risk. Patients from families having more than one child under five years had a 213% higher risk of death compared with those living with no other small child. Treatment abandonment also had a profound effect on death risk. CONCLUSION: Childhood cancer is notably important considering the potential years of life lost. RB has even more important elements, as the possibility of vision loss in cases with delayed diagnosis. Family characteristics seem to be highly related to RB survival, especially in low- and middle-income countries, where inequalities are still a public health issue. Strategies to improve survival should focus not only on large-scale settings such as improving national healthcare systems but also on more personalized actions that might help to mitigate disparities.

Estimation of radiation exposure of children undergoing superselective intra-arterial chemotherapy for retinoblastoma treatment: assessment of local diagnostic reference levels as a function of age, sex, and interventional success.

PURPOSE: This study aims to determine local diagnostic reference levels (LDRLs) of intra-arterial chemotherapy (IAC) procedures of pediatric patients with retinoblastoma (RB) to provide data for establishing diagnostic reference levels (DRLs) in pediatric interventional radiology (IR). METHODS: In a retrospective study design, LDRLs and achievable dose (AD) were assessed for children undergoing superselective IAC for RB treatment. All procedures were performed at the flat-panel angiography systems (I) ArtisQ biplane (Siemens Healthineers) and (II) Allura Xper (Philips Healthcare). Patients were differentiated according to age (A1: 1-3 months; A2: 4-12 months; A3: 13-72 months; A4: 73 months-10 years; A5: > 10 years), sex, conducted or not-conducted chemotherapy. RESULTS: 248 neurointerventional procedures of 130 pediatric patients (median age 14.5 months, range 5-127 months) with RB (68 unilateral, 62 bilateral) could be included between January 2010 and March 2020. The following diagnostic reference values, AD, and mean values could be determined: (A2) DRL 3.9 Gy cm2, AD 2.9 Gy cm2, mean 3.5 Gy cm2; (A3) DRL 7.0 Gy cm2, AD 4.3 Gy cm2, mean 6.0 Gy cm2; (A4) DRL 14.5 Gy cm2, AD 10.7 Gy cm2, mean 10.8 Gy cm2; (A5) AD 8.8 Gy cm2, mean 8.8 Gy cm2. Kruskal-Wallis-test confirmed a significant dose difference between the examined age groups (A2-A5) (p < 0.001). There was no statistical difference considering sex (p = 0.076) and conducted or not-conducted chemotherapy (p = 0.627). A successful procedure was achieved in 207/248 cases. CONCLUSION: We report on radiation exposure during superselective IAC of a pediatric cohort at the German Retinoblastoma Referral Centre. Although an IAC formally represents a therapeutic procedure, our results confirm that radiation exposure lies within the exposure of a diagnostic interventional procedure. DRLs for superselective IAC are substantially lower compared with DRLs of more complex endovascular interventions.

Assessment of Retinoblastoma Capacity in the Middle East, North Africa, and West Asia Region.

PURPOSE: We aimed to evaluate the capacity to treat retinoblastoma in the Middle East, North Africa, and West Asia region. METHODS: A Web-based assessment that investigated retinoblastoma-related pediatric oncology and ophthalmology infrastructure and associated capacity at member institutions of the Pediatric Oncology East and Mediterranean group was distributed. Data were analyzed in terms of availability, location, and confidence of use for each resource needed for the management of retinoblastoma. Resources were categorized by diagnostics, focal therapy, chemotherapy, advanced treatment, and supportive care. Responding institutions were further divided into an asset-based tiered system. RESULTS: In total, responses from 23 institutions were obtained. Fifteen institutions reported the availability of an ophthalmologist, 12 of which held primary off-site appointments. All institutions reported the availability of a pediatric oncologist and systemic chemotherapy A significant portion of available resources was located off site. Green laser was available on site at seven institutions, diode laser at six institutions, cryotherapy at 12 institutions, and brachytherapy at nine institutions. There existed marked disparity between the availability of some specific ophthalmic resources and oncologic resources. CONCLUSION: The assessment revealed common themes related to the treatment of retinoblastoma in low- and- middle-income countries, including decentralization of care, limited resources, and lack of multidisciplinary care. Resource disparities warrant targeted intervention in the Middle East, North Africa, and West Asia region to advance the management of retinoblastoma in the region.