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Cancer Res Treat. 2018 Apr;50(2):495-505. doi: 10.4143/crt.2016.577. Epub 2017 May 22.

ALK Protein Expression Is Related to Neuroblastoma Aggressiveness But Is Not Independent Prognostic Factor.

Author information

1
Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2
Department of Pathology, Seoul National University College of Medicine, Seoul, Korea.
3
Department of Pediatrics, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea.

Abstract

PURPOSE:

In this study, anaplastic lymphoma kinase (ALK) mutation and amplification, ALK protein expression, loss of the nuclear alpha thalassemia/mental retardation syndrome X-linked (ATRX) protein, and telomerase reverse transcriptase (TERT) protein expressionwere studied to investigate potential correlations between these molecular characteristics and clinical features or outcomes in neuroblastoma.

MATERIALS AND METHODS:

Seventy-two patients were enrolled in this study. Polymerase chain reaction amplification and direct sequencing were used for mutation analysis. ALK and MYCN amplifications were detected by fluorescence in situ hybridization. Protein expressionwas evaluated by immunohistochemical (IHC) staining.

RESULTS:

ALK mutation was found in only two patients (4.1%); ALK amplification was not detected. ALK positivity, loss of nuclear ATRX protein, TERT positivity by IHC were detected in 40 (55.6%), nine (13.0%), and 42 (59.2%) patients, respectively. The incidence of ALK expression increased in accordance with increasing tumor stage (p=0.001) and risk group (p < 0.001). The relapse rate was significantly higher in ALK+ patients compared to that of other patients (47.5% vs. 11.3%, p=0.007). However, there was no significant difference in relapse rate when the survival analysis was confined to the high-risk patients.

CONCLUSION:

Although ALK mutation was rare and no amplification was observed, ALK protein expression was found in a significant number of patients and was correlated with advanced stage and high-risk neuroblastoma. ALK protein expression could be considered as a marker related to the aggressive neuroblastoma, but it was not the independent prognostic factor for the outcome.

KEYWORDS:

Anaplastic lymphoma kinase; Immunohistochemistry; Neuroblastoma; Telomere

PMID:
28546523
PMCID:
PMC5912141
DOI:
10.4143/crt.2016.577
[Indexed for MEDLINE]
Free PMC Article

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