Anti-p40 (ΔNp63) CE/IVD antibodies are widely used immunohistochemical reagents in pulmonary pathology for the accurate classification of non-small cell lung carcinoma (NSCLC), particularly in the distinction of squamous cell carcinoma from adenocarcinoma. Peer-reviewed studies have demonstrated that p40 corresponds to the ΔNp63 isoform of the p63 gene and represents a highly specific marker of squamous differentiation in epithelial tissues of the lung.

Biological significance of p40 (ΔNp63)

p40 is an N-terminally truncated isoform of the p63 transcription factor, expressed in basal and squamous epithelial cells. Unlike full-length p63, ΔNp63/p40 lacks the transactivation domain, which results in distinct functional properties in epithelial cell biology.

• In pulmonary tissues, its expression is associated with squamous/basal cell differentiation pathways and is rarely observed in glandular epithelium.
• Studies in peer-reviewed literature have shown that p40 maintains equivalent sensitivity to p63 for squamous cell carcinoma while demonstrating markedly improved specificity due to minimal expression in adenocarcinomas and non-squamous tumors.

Diagnostic utility in pulmonary pathology

In lung cancer diagnostics, accurate subtyping of NSCLC is essential for therapeutic decision-making.

• Immunohistochemical studies consistently report that p40 is strongly and diffusely expressed in the majority of pulmonary squamous cell carcinomas, while showing negligible staining in adenocarcinomas and other non-squamous malignancies.
• Comparative analyses have demonstrated that p40 outperforms traditional p63 immunostaining by reducing false-positive interpretation in adenocarcinoma cases, thereby improving diagnostic specificity in routine histopathological evaluation.
• Consequently, p40 is recommended as a primary squamous differentiation marker in diagnostic antibody panels, often in combination with adenocarcinoma-associated markers such as TTF-1 and Napsin A.

Key features of Anti-p40 CE/IVD antibodies

Anti-p40 CE/IVD antibodies are designed to ensure standardized, clinically reliable performance in immunohistochemistry applications within regulated diagnostic environments.

• High specificity for ΔNp63 (p40) isoform, minimizing cross-reactivity with non-squamous tumors.
• Strong nuclear staining in squamous cell carcinoma of the lung.
• Enhanced diagnostic accuracy compared with p63 in NSCLC subclassification.
• Validated for in vitro diagnostic use under CE/IVD compliance standards.
• Optimized for formalin-fixed, paraffin-embedded (FFPE) tissue sections.
• Suitable for inclusion in routine pulmonary pathology antibody panels for tumor typing.