A Backwards Approach to GD2 Immunofluorescence in Human Neuroblastoma Tissue Samples: From Staining to Slicing

Area of Science:

• Oncology
• Immunohistochemistry
• Molecular Diagnostics

Background:

• Disialoganglioside GD2 is overexpressed in solid tumors, driving tumor growth and aggressive phenotypes.
• GD2 is a crucial tumor marker and therapeutic target, particularly in neuroblastoma treatment.
• Characterizing GD2 in neuroblastoma tissue is challenging due to epitope loss after fixation.

Purpose of the Study:

• To assess a novel protocol for staining GD2 in tissue specimens before fixation.
• To validate a new method for GD2 immunodetection in unfixed primary neuroblastoma.

Main Methods:

• Immunohistochemistry was performed on neuroblastoma tissue before fixation using anti-GD2 antibodies.
• Positive and negative controls (neuroblastoma, nephroblastoma, Hodgkin lymphoma) were used.
• 3D and 2D immunofluorescence microscopy evaluated GD2 staining before and after paraffinization.

Main Results:

• The protocol successfully detected GD2 in positive controls and showed absence in negative controls.
• No significant GD2 signal loss occurred after fixation, paraffinization, and slicing.
• Long incubation times for 3D specimens caused increased cytolysis in unfixed tissue.

Conclusions:

• A novel, validated protocol reliably performs GD2 immunostaining in unfixed neuroblastoma tissue.
• The workflow allows for relatively quick assessment of GD2 status.
• This method may serve as a valuable diagnostic tool for tumor staging and precision medicine.