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Published on: December 25, 2017
Comparative Evaluation of APAFIX and 10% Formalin for Human Histologic Tissue Preservation: A Pilot Study
Nidal A Qinna1,2, Husam A Abu-Farsakh3, Bayan Y Ghanim2
1Division of Pharmacology and Pharmaceutical Technology, Faculty of Pharmacy and Medical Sciences, University of Petra, 11196, Amman, Jordan.
Summary
APAFIX, a new formalin-free fixative, shows comparable diagnostic performance to traditional formalin in preserving tissue architecture and cellular morphology. This safer alternative offers enhanced nuclear detail and lymphocyte visualization for histopathology.
Area of Science:
- Histopathology
- Tissue Fixation
- Diagnostic Pathology
Background:
- Formalin, the standard histopathology fixative, presents limitations including antigen masking, nucleic acid degradation, and carcinogenicity.
- Safer alternatives to formalin are sought to improve safety in routine tissue handling while maintaining diagnostic integrity.
Purpose of the Study:
- To compare the efficacy of APAFIX, a novel formalin-free fixative, against traditional 10% formalin.
- To evaluate the preservation of human histologic tissue architecture and cellular morphology using routine Hematoxylin and Eosin (H and E) staining.
Main Methods:
- Ten human biopsies from diverse origins were fixed for 6-8 hours in either APAFIX or 10% formalin.
- Standard H and E staining and paraffin embedding techniques were applied.
- A blinded pathology review assessed histologic parameters, nuclear detail, lymphocyte visualization, fibrous tissue integrity, and overall architecture using a 10-point scoring system.
Main Results:
- APAFIX demonstrated comparable effectiveness to formalin in tissue processing, sectioning, and preserving architectural and cellular morphology.
- APAFIX showed enhanced nuclear detail and lymphocyte visualization, with occasional artifacts like pseudolipomatosis in epithelial tissue.
- Formalin exhibited superior preservation of fibrous and epithelial areas compared to APAFIX.
Conclusions:
- APAFIX exhibits sufficient diagnostic performance across various pathologic biopsies, proving to be a promising formalin-free alternative.
- The fixative offers enhanced preservation of critical cellular features and eliminates health hazards associated with formalin.
- Further large-scale studies are recommended to validate APAFIX in broader diagnostic settings and specialized staining techniques.
