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Open Access

Metastatic 4S neuroblastoma with excellent outcome in Saudi cancer center

Waheed A. AlZhrani, Naglla A. Elimam, Abeer S. Almehdar, Saeed M. Bassem, Daniah E. Abdullatif, Khursheed D. Ahmed and Abdullah A. Baothman
Saudi Medical Journal December 2021, 42 (12) 1353-1356; DOI: https://doi.org/10.15537/smj.2021.42.12.20210658
Waheed A. AlZhrani
From the Pediatric Hematology and Oncology, Oncology Department (AlZhrani, Elimam, Basim, Abdullatif, Ahmed, Baothman) and from the Radiology Department (Almehdar), Princess Norah Oncology Center, King Abdulaziz Medical City, Jeddah, Kingdom of Saudi Arabia.
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Naglla A. Elimam
From the Pediatric Hematology and Oncology, Oncology Department (AlZhrani, Elimam, Basim, Abdullatif, Ahmed, Baothman) and from the Radiology Department (Almehdar), Princess Norah Oncology Center, King Abdulaziz Medical City, Jeddah, Kingdom of Saudi Arabia.
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Abeer S. Almehdar
From the Pediatric Hematology and Oncology, Oncology Department (AlZhrani, Elimam, Basim, Abdullatif, Ahmed, Baothman) and from the Radiology Department (Almehdar), Princess Norah Oncology Center, King Abdulaziz Medical City, Jeddah, Kingdom of Saudi Arabia.
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Saeed M. Bassem
From the Pediatric Hematology and Oncology, Oncology Department (AlZhrani, Elimam, Basim, Abdullatif, Ahmed, Baothman) and from the Radiology Department (Almehdar), Princess Norah Oncology Center, King Abdulaziz Medical City, Jeddah, Kingdom of Saudi Arabia.
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Daniah E. Abdullatif
From the Pediatric Hematology and Oncology, Oncology Department (AlZhrani, Elimam, Basim, Abdullatif, Ahmed, Baothman) and from the Radiology Department (Almehdar), Princess Norah Oncology Center, King Abdulaziz Medical City, Jeddah, Kingdom of Saudi Arabia.
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Khursheed D. Ahmed
From the Pediatric Hematology and Oncology, Oncology Department (AlZhrani, Elimam, Basim, Abdullatif, Ahmed, Baothman) and from the Radiology Department (Almehdar), Princess Norah Oncology Center, King Abdulaziz Medical City, Jeddah, Kingdom of Saudi Arabia.
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Abdullah A. Baothman
From the Pediatric Hematology and Oncology, Oncology Department (AlZhrani, Elimam, Basim, Abdullatif, Ahmed, Baothman) and from the Radiology Department (Almehdar), Princess Norah Oncology Center, King Abdulaziz Medical City, Jeddah, Kingdom of Saudi Arabia.
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Abstract

Objectives: To retrospectively review a small series of infant neuroblastoma (NBL) in a single Saudi medical institution over 10 years, including their presentation, management, and outcomes.

Methods: Fifty-three subjects aged 0 to 14 years with previously untreated NBL who were diagnosed and treated at Princess Nora Oncology Center, King Abdulaziz Medical City (KAMC), Jeddah, Saudi Arabia, between 2010 and 2019. Six infants (11.3%) had stage 4S characteristics.

Results: The median age at diagnosis was 3 months (range 52 days - 4 months). Biopsies confirmed that the adrenal gland was the primary tumor site for 3 patients, while the other 2 had retroperitoneal sites. Four patients had favorable histology, and one had unfavorable histology. All patients had liver metastasis, and no bone marrow or skin metastasis was recorded. All patients received chemotherapy except one, and all survived with no disease progression at a median follow up to 5 years.

Conclusion: Our data confirm that NBL-4S is a curable cancer, especially with early recognition and intervention. Chemotherapy is the first-line treatment for symptomatic patients. Unless the condition is life threatening, radiotherapy is not indicated. Surgical resection may be indicated in younger infants with localized tumors and favorable biology, but otherwise, it is not usually indicated for residual cases.

Keywords:
  • neuroblastoma
  • International Neuroblastoma Staging System
  • 4S NBL (stage 4 special neuroblastoma)

Neuroblastoma (NBL) is an embryonal tumor of the sympathetic nervous system that arises from the neural crest. It is the most common extracranial solid tumor during infancy and accounts for 7% of all childhood cancer diagnoses. Disease staging is an important prognostic factor and is used for risk stratification and treatment assignment. Stage 4s is defined as patients <12 months old with localized primary tumor, stage 1 or 2, and distant metastasis limited to the bone marrow, liver, or skin. It has excellent outcomes, and some patients develop spontaneous regression.

Large tumors may cause life-threatening compression of the lungs, kidneys, intestines, and inferior vena cava. In symptomatic cases, chemotherapy can be used for active regression and treatment. Asymptotic cases can be monitored by regular clinical, biochemical, and serial radiologic evaluations. We aimed to analyze the clinical presentation, age at onset, outcome of infants diagnosed to have stage 4(s) NBL and to compare with others.

Methods

The electronic data of 53 patients with NBL were retrospectively reviewed to identify cases of NBL (4S). The patients were selected from those who were diagnosed and treated at Princess Nora Oncology Center (PNOC), King Abdul-Aziz Medical City (KAMC), Jeddah, Saudi Arabia, from January 2010 to December 2019. The clinical characteristics and outcomes were examined. Ethical approval for the study was obtained from the ethic committee of KAMC.

The NBL patients were diagnosed based on the results of histopathology, immunohistochemistry, and molecular biology examinations (N-MYC, DNA ploidy, 1p and q 11 deletion, MKI) after surgical excision or open biopsy with reference to the onset age of <12 months. Staging was based on the International Neuroblastoma Risk Group Staging System (INRGSS) before surgery.1

Stage 4s disease was defined as local stage 1 or 2 with metastases isolated to the liver, skin, or bone marrow in an infant younger than 12 months of age. Tumor response was assessed using the International Neuroblastoma Response Criteria (INRC).2 Patients were mainly treated with chemotherapy according to the children’s oncology group (COG) ANBL1232 protocol, as shown in Table 1. None of the patients had surgery for residual disease (cases 4 and 6).

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Table 1

- Chemotherapy schedules for symptomatic infant neuroblastoma (4S).

Result

Out of 53 retrospectively reviewed files, 6 patients (11%) were diagnosed with stage 4s NBL, and 4 patients were female. The median age at diagnosis was 3 months (range 52 days - 4 months). Biopsies confirmed that the adrenal gland was the primary tumor site for 3 patients, while the other 2 had retroperitoneal sites. For one patient, the diagnosis was made using clinical progressive hepatomegaly, respiratory distress, and radiological findings. Later, pathology results from the hepatic lesion revealed a poorly differentiated, non-amplified N-MYC pathology.

There were 4 patients with favorable histology and 2 with unfavorable histology. None of the N-MYC results were amplified. All patients had liver metastasis, and no bone marrow or skin metastasis was recorded. All patients survived with no disease progression at a median follow up to 5 years. The patients’ characteristics and outcomes are shown in Table 2.

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Table 2

- Patient’s characteristics, treatment plan, and outcome.

One patient did not require any medical or surgical intervention, while 5 patients received chemotherapy based on the clinical situation and Philadelphia clinical score for 4s NBL disease. The chemotherapy protocol used for the 5 patients was ANBL 1232, based on which 3 patients received 8 cycles, and 2 patients received 4 cycles, they showed complete clinical and radiological resolutions. The decision on the number of cycles was based on the patient’s clinical condition and radiological response (mainly in computed tomography scans). All patients have survived, although 2 of them have a residual tumor that was <10% of the initial tumor mass size and required no secondary surgical intervention.

Discussion

Stage 4s NBL is a special infant tumor that represents 5% of NBL cases.3 It has been established as having a significantly better prognosis than historical results with International Neuroblastoma Staging System stage 4 NBL in children. The P9641 and COG A3961 trials of the COG confirmed that excellent results are obtained for patients with low risk, including those with stage 4s and intermediate-risk disease. The 5-year event-free survival rate was 89%, and the over survival rate was 97%.4,5 With only surgery, a younger infant (<6 months) with localized disease and favorable biology had an even better outcome.

In 2012, COG prospectively reported that 87 localized NBL cases involving patients <6 months old had a >90% 3-year survival rate after surgery only and observation.6 This was recently confirmed by an Italian NBL group, which showed that patients who underwent early tumor resection were associated with better outcomes.7 Even though the majority of patients present with metastasis, some of them have spontaneous regression, but 10-20% of infants do not survive due to early complications, which is mainly the result of massive hepatomegaly, renal obstruction, and coagulopathy.8-10

There are no clear guidelines regarding the justification to start chemotherapy or the choice of combination regimens. We utilized chemotherapy as a first-line modality in 5 patients (cases 1, 3, 4, 5, and 6), which proved to be effective and was well tolerated. Clinical data suggest that the combination of carboplatin and etoposide is preferable as a first-line treatment, and a more intense chemotherapy or radiotherapy should be used for refractory cases.11

Only one infant who required no intervention and displayed a complete resolution of primary and metastatic tumors, while the other 2 (cases 4 and 6) continue to have a residual tumor after 8 months since the initial diagnosis, but they remain asymptomatic. None of our patients required urgent radiotherapy or surgical intervention. In addition, none of them developed spontaneous abdominal compartment syndrome during or after biopsy. All patients survived with no disease progression at a median follow up of 5 years. Our results confirm those of a previous successful study carried out in the same institution by Najla et al.12

Study limitations

Our case series is limited by its retrospective nature and small size number of infants included. It would be a reference for further collaborative study of collecting more patients to draw more of conclusions and strengthen the studies.

In conclusion, stage 4s NBL is a distinct tumor that may undergo spontaneous regression. Chemotherapy is the first-line treatment for symptomatic patients. Unless the condition is life threatening, radiotherapy is not indicated. Surgical resection may be indicated for younger infants with localized tumor and favorable biology, but otherwise, it is not usually indicated for residual cases.

Acknowledgment

The authors gratefully acknowledge American Manuscript Editors (https://www.americanmanuscripteditors.com) for English language editing.

Footnotes

  • Disclosure. Authors have no conflict of interests, and the work was not supported or funded by any drug company.

  • Received August 20, 2021.
  • Accepted November 23, 2021.
  • Copyright: © Saudi Medical Journal

This is an Open Access journal and articles published are distributed under the terms of the Creative Commons Attribution-NonCommercial License (CC BY-NC). Readers may copy, distribute, and display the work for non-commercial purposes with the proper citation of the original work.

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Metastatic 4S neuroblastoma with excellent outcome in Saudi cancer center
Waheed A. AlZhrani, Naglla A. Elimam, Abeer S. Almehdar, Saeed M. Bassem, Daniah E. Abdullatif, Khursheed D. Ahmed, Abdullah A. Baothman
Saudi Medical Journal Dec 2021, 42 (12) 1353-1356; DOI: 10.15537/smj.2021.42.12.20210658

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Metastatic 4S neuroblastoma with excellent outcome in Saudi cancer center
Waheed A. AlZhrani, Naglla A. Elimam, Abeer S. Almehdar, Saeed M. Bassem, Daniah E. Abdullatif, Khursheed D. Ahmed, Abdullah A. Baothman
Saudi Medical Journal Dec 2021, 42 (12) 1353-1356; DOI: 10.15537/smj.2021.42.12.20210658
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