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Quantitative Immunohistochemistry of the Cellular Microenvironment in Patient Glioblastoma Resections
Published on: July 31, 2017
Hypoxic tumor microenvironment in advanced retinoblastoma
Job Sudhakar1, Nalini Venkatesan, Shruthi Lakshmanan
1Department of Ocular Pathology, Vision Research Foundation, Sankara Nethralaya, Chennai, Tamil Nadu, India.
Pediatric Blood & Cancer
|June 28, 2013
Summary
Hypoxia inducible factor-1α (HIF-1α), Carbonic anhydrase IX (CA IX), and survivin are frequently expressed in retinoblastoma (RB). Their deregulation suggests potential therapeutic targets for improving RB treatment outcomes.
Area of Science:
- Oncology
- Molecular Biology
- Pathology
Background:
- Retinoblastoma (RB) is a pediatric malignancy with variable therapeutic responses.
- Tumor microenvironment, particularly hypoxia, influences treatment outcomes in various cancers.
- Identifying factors contributing to therapeutic resistance in RB is crucial for improving patient care.
Purpose of the Study:
- To investigate the presence and expression levels of hypoxia and related proteins, including Hypoxia inducible factor-1α (HIF-1α), Carbonic anhydrase IX (CA IX), and survivin, in retinoblastoma tumors.
- To analyze the association between the expression of these markers and clinicopathological features of retinoblastoma.
Main Methods:
- Immunohistochemistry was employed to evaluate the expression of HIF-1α and survivin in 42 retinoblastoma samples and CA IX in 33 samples.
- Tumor samples were categorized based on invasion, differentiation, and International Intraocular Retinoblastoma Classification (IIRC) for correlation analysis.
Main Results:
- High expression rates of HIF-1α (83%), survivin (86%), and CA IX (93%) were observed in retinoblastoma tumors.
- While no significant correlation was found between HIF-1α/CA IX and invasion/differentiation/IIRC groups, increased survivin expression was noted in advanced tumors (Group E vs. D).
- Significant associations were identified between HIF-1α and survivin in both differentiated and undifferentiated tumors, and between HIF-1α and CA IX in tumors with high HIF-1α immunoreactivity.
Conclusions:
- The Hypoxia inducible factor-1α (HIF-1α) pathway appears to be deregulated in retinoblastoma.
- The findings suggest a potential role for these markers in drug resistance.
- Further research is warranted to explore the therapeutic potential of targeting HIF-1α, CA IX, and survivin in retinoblastoma treatment.
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