Prediagnostic Intervals in Retinoblastoma: Experience at an Oncology Center in Brazil

Strategies to improve diagnosis and access to treatment of retinoblastoma in low- and middle-income countries: A systematic review

Retinoblastoma, the most common intraocular tumor in childhood, still faces challenges in diagnosis and treatment, particularly in low- and middle-income countries. Identifying strategies to improve the time to diagnosis and access to treatment is crucial to enhance survival rates and preserve ocular health. We conducted a systematic review to identify interventions that have demonstrated potential in addressing these challenges. We performed a comprehensive search across databases until March 2023. Out of the studies reviewed, 21 met the inclusion criteria and were categorized into five main areas: surveillance strategies, genetic counseling, education, public assistance, and international partnership. Despite the obstacles faced, the initiatives identified in this review present acts toward improving the time to diagnosis and access to treatment for retinoblastoma. Based on the extracted data, we propose a comprehensive chain of initiatives. We firmly believe that implementing this chain of initiatives can lead to improved clinical outcomes for retinoblastoma patients.

Retinoblastoma treatment in a Brazilian population. Presentation and long-term results

INTRODUCTION

Retinoblastoma is a malignant tumor with a high cure potential when proper therapy is used. The purpose of this paper is to report the clinical features and outcomes of patients with retinoblastoma who were treated with a combination of local and systemic chemotherapy-based protocols.

METHOD

We retrospectively studied patients treated with systemic chemotherapy plus local treatment between 2003 and 2015 with a follow-up ≥2 years. We correlated clinical and pathological characteristics with decimal visual acuity (VA) and death.

RESULTS

Among 119 patients, 60% had unilateral disease (UNI), and 52% were male. The median presentation age was 19.5 months, 10% had a positive family history, and the most frequent sign was leukocoria (68.8%). Advanced disease was more frequent in eyes with UNI (98.4%) than in eyes with bilateral retinoblastoma (BIL: 55.3%). Enucleation was performed in 97% of UNI eyes and in 55.8% of BIL eyes. The overall globe salvage was 26.6%, 44.25% of BIL eyes. Bilateral enucleation was required in 5%. High-risk pathologic features occurred in 50% and 37% of eyes enucleated without and with neoadjuvant chemotherapy, respectively. High-risk features were related to the presence of goniosynechiae in the pathologic specimen and were more frequent in children younger than 10 months or older than 40 months. Extraocular disease was present in 5% of patients, and the death rate related to metastasis of the tumor was 8%. The final VA was ≥ 0.7 in 72.8% and ≥0.1 in 91% of BIL patients.

CONCLUSIONS

Treatment of retinoblastoma with conservative systemic-based chemotherapy was associated with an excellent survival rate (92%). Albeit the low overall globe salvage rate, in BIL patients, approximately half the eyes were conserved, and a satisfactory functional visual result was achieved The evaluated protocol is an important treatment option, especially in developing countries.

Clinical and genetic characteristics of retinoblastoma patients in a single center with four novel RB1 variants

AIM

To assess the clinical and genetic characteristics of children diagnosed with retinoblastoma (RB) at Gazi University Faculty of Medicine's Department of Pediatric Oncology.

METHODS

All cases diagnosed with RB and received treatment and follow-up in the Ophthalmology and Pediatric Oncology Department, October 2016 to May 2021 were evaluated retrospectively. The RB1 gene was analyzed by next-generation sequencing (NGS) technique in DNAs obtained from peripheral blood samples of the patients.

RESULTS

This study included 53 cases with 67 RB-affected eyes during the study period. The mean age was 24.6 (median: 18.5, range: 3-151)mo. There were 15 (22.3%) Group D eyes and 39 (58.2%) Group E eyes. The RB1 gene was sequenced by the NGS method in 19 patients. Heterozygous RB1:NM_000321.3: c.54_76del (p.Glu19AlafsTer4) variant was detected in a 15-month-old female with bilateral RB. Heterozygous RB1:NM_000321.3: c.1814+3A>T variant was detected in a 5.5-month-old male with bilateral RB. The intronic RB1:NM_000321.3: c.1332+4A>G variant was detected in patient 14, a 13-month-old male with unilateral RB. The RB1:NM_000321.3: c.575_576del (p.Lys192SerfsTer10) variant was found in an 18-month-old female with an allele frequency of 37%. These variants have not been reported in the literature and mutation databases.

CONCLUSION

Four novel variants are described and one of them is found in two different patients. This data is crucial for assessing prognosis. It serves as a guide for estimating the long-term risk of secondary malignancy as well as the short-term risk of developing additional malignancies in the same eye and the other eye.

Treatment Outcome of Children with Retinoblastoma in a Tertiary Care Referral Hospital in Indonesia

Background:

Although survival rates for retinoblastoma (RB) are over 95% in high-income countries, its high mortality rate in low and middle-income countries remains a great concern. Few studies investigated treatment outcome and factors contributing to RB survival in these latter settings. Aims of this study are to determine treatment outcome of Indonesian children diagnosed with RB and to explore factors predictive of treatment outcome.

Methods:

This study was a retrospective medical records review combined with an illustrative case report. Children newly diagnosed with RB between January 2011 and December 2016 at a tertiary care referral hospital in Indonesia were included. A home visit was conducted to perform an in-depth interview with a mother of two children affected by RB.

Results:

Of all 61 children with RB, 39% abandoned treatment, 21% died, 20% had progressive or relapsed disease and 20% event-free survival. Progressive or relapsed disease was more common in older (≥ 2 years at diagnosis, 29%) than young (<2 years at diagnosis, 0%) children (P=0.012). Event-free survival estimate at 5 years was higher in young (42%) than older (6%) children (P=0.045). Odds-ratio for event-free survival was 6.9 (95% CI: 1.747 – 27.328, P=0.006) for young versus older children. Other clinical and socio-demographic characteristics had no significant correlation with treatment outcome or event-free survival. The case report elucidated conditions and obstacles that Indonesian families face when their children are diagnosed with RB.

Conclusion:

Survival of children with RB in Indonesia is much lower compared to high-income and many other low and middle-income countries. Abandonment of treatment is the most common cause of treatment failure. Older age at diagnosis is associated with more progressive or relapsed disease and worse survival. Interventions to improve general public and health-care providers’ awareness, early detection and treatment adherence are required.

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.

Role of ethnicity and socioeconomic status (SES) in the presentation of retinoblastoma: findings from the UK

Background

The relationship between the ethnic background or socioeconomic status (SES) and late retinoblastoma (Rb) presentation in the UK is unclear. We aimed to investigate if such correlations exist in a cohort of non-familial Rb cases.

Methods

A cross-sectional study based at the two centres providing Rb care in the UK. Included were non-familial Rb cases that presented from January 2006 to December 2011. Epidemiological and clinical data were retrieved from medical charts, as well as patients’ postcodes used to obtain the Index of Multiple Deprivation (IMD) score. A postal questionnaire was sent to participants’ parents to collect further, person-level, information on languages spoken and household socioeconomic position. Statistical correlations to advanced Rb at presentation as well as to treatment by enucleation and need for adjuvant chemotherapy were investigated.

Results

The cohort included 189 cases, 98 (51.8%) of which were males. The median age at diagnosis was 16 months (IQR 8–34 months). Of the study patients, 153 (81%) presented with advanced Rb; 78 (41%) with group D and 75 (40%) with group E Rb. A total of 134 (72%) patients were treated with enucleation. South Asian ethnicity and being in the most deprived IMD quintile were associated with a higher likelihood of presentation with advanced disease, but these estimates did not reach statistical significance. Older age at presentation was associated with enucleation and bilateral disease with adjuvant chemotherapy.

Conclusions

In this national UK study of patients with non-familial Rb, there was no evidence of an association of ethnicity or SES and the risk of presenting with advanced disease. These findings may reflect equality in access of healthcare in the UK.

A 20-year audit of retinoblastoma treatment outcomes

Objectives

To evaluate the long-term treatment outcomes in intraocular retinoblastoma (RB) including the associated factors for eventual treatment with external beam radiotherapy (EBRT) and enucleation as well as to analyse the risk factors for metastasis and death in extraocular RB.

Methods

Retrospective analysis of 390 eyes from 256 (89.8%) intraocular RB and 29 (10.2%) extraocular RB cases diagnosed and treated between October 1998 and May 2018 at one of the largest tertiary care centers in Turkey.

Results

Of 351 intraocular RB eyes, 53.3% had group D/E disease at presentation. 75 (21.4%) of 351 eyes underwent primary enucleation. Of the remaining 276 eyes undergoing eye-conserving treatments, 201 (72.8%) were salvaged. Most of these eyes were treated using intravenous chemotherapy and/or focal treatments [transpupillary thermotherapy (TTT) and cryotherapy] initially. EBRT was eventually required in 48 (17.4%) eyes and secondary enucleation in 75 (27.2%) eyes. At mean follow-ups of 76.7 and 39.7 months for intraocular and extraocular RB cohorts, respectively, 180 (46.2%) eyes underwent primary/secondary enucleation and exenteration. Overall, 13 cases developed metastasis and 9 died. Two patients with trilateral RB also expired. Multivariable risk factors for enucleation were the presence of vitreous seeds (p < 0.001), absence of EBRT administration (p = 0.033), 5–9 TTT applications compared with no TTT (p = 0.031), and each 1 mm increase in tumour base diameter (p < 0.001). Univariate factors predictive of metastasis were the presence of extraocular RB detected by imaging methods (p < 0.001) and extrascleral/optic nerve cut end involvement at histopathological examination (p < 0.001).

Conclusions

In our series, 72.8% of the intraocular RB eyes undergoing eye-conserving treatments were saved. The globe salvage rate for all intraocular and extraocular RB eyes was 53.8% and the overall survival rate was 96.1%.

Time to diagnosis of retinoblastoma in Latin America: A systematic review

Retinoblastoma (RB) is the most common intraocular tumor of childhood. In low income countries, Time to diagnosis (TTD: interval between first symptom and diagnosis) has been associated with extraocular disease, metastasis and mortality. However, the relationship between TTD and prognosis is complex and not simply a linear correlation, particularly if TTD is <6 months. This systematic review aims to identify studies reporting TTD of retinoblastoma in Latin America, highlighting factors affecting TTD, alongside proposals and initiatives to obtain shorter intervals. The review also aims to discuss the methodology linked to cancer pathways studies. The study respected PRISMA recommendations, was registered on Prospero, an international database for systematic review registries under number CRD42017076777. MEDLINE/PUBMED, LILACS and SCIELO databases were searched. Studies from Latin America and the Caribbean, published between 1997 and 2017, reporting TTD and age at diagnosis of patients with retinoblastoma were selected. Nine studies were selected, concerning 1560 patients from Argentina, Brazil, Chile, Honduras, Mexico and Peru. The median TTD ranged from 3 to 5 months and the median age at diagnosis ranged from 16.5 to 22.2 months. A prolonged TTD was observed and was associated to damaging results on retinoblastoma outcomes, particularly increasing extraocular disease, and mortality rates. Methodological heterogeneity was observed and reiterates the importance of standardization of TTD studies, allowing more reliable comparisons and greater knowledge about retinoblastoma pathways before diagnosis. Reports on successful initiatives against delayed diagnosis were scarce, emphasizing a need for further studies.

Evaluation of continuing education of family health strategy teams for the early identification of suspected cases of cancer in children

BACKGROUND

This study evaluated the influence of continuing education of family health strategy teams by the Ronald McDonald Institute program on the early diagnosis of cancer in children and adolescents.

METHODS

The study applied Habicht's model to evaluate the adequacy and plausibility of continuing education by using as outcome the number of children with suspected cancer who were referred to the hospital of references in the 1 year before and 1 year after intervention and the number of patients referred by intervention group and control group family health strategy teams. Medical records from each hospital of reference were used to collect information of suspect cases of cancer. Descriptive analyses were performed using frequencies and mean values. Chi-square tests were used to assess statistically significant differences between the groups and periods by using p-values < 0.05.

RESULTS

The results showed a 30.6% increase in the number of children referred to the hospital of reference for suspected cancer in the post-intervention period; in addition, the family health strategy teams that underwent the intervention referred 3.6 times more number of children to hospital of references than did the control group. Only the intervention group showed an increase in the number of confirmed cases.

CONCLUSIONS

This evaluation of a continuing education program for early identification of pediatric cancer showed that the program was adequate in achieving the established goals and that the results could be attributed to the program.