title: Study of Collagen Birefringence in Different Grades of Oral Squamous Cell Carcinoma Using Picrosirius Red and Polarized Light Microscopy.
abstract: Objectives. The present study was done to evaluate birefringence pattern of collagen fibres in different grades of oral squamous cell carcinoma using Picrosirius red stain and polarization microscopy and to determine if there is a change in collagen fibres between different grades of oral squamous cell carcinoma. Materials and Methods. Picrosirius red stained 5 μm thick sections of previously diagnosed different grades of squamous cell carcinoma and normal oral mucosa were studied under polarization microscopy for arrangement as well as birefringence of collagen fibres around tumour islands. Results. It was found that thin collagen fibres increased and thick collagen fibres decreased with dedifferentiation of OSCC (P < 0.0001). It was observed that there was change in polarization colours of thick fibres from yellowish orange to greenish yellow with dedifferentiation of OSCC indicating loosely packed fibres (P < 0.0001). Conclusion. There was a gradual change of birefringence of collagen from yellowish orange to greenish yellow from well to poorly differentiated squamous cell carcinoma, indicating that there is a change from mature form of collagen to immature form as tumour progresses. Studying collagen fibres with Picrosirius red for stromal changes around tumour islands along with routine staining may help in predicting the prognosis of tumour.
authors.affiliation: Oral & Maxillofacial Pathology, Sri Sankara Dental College, Varkala, Akathumuri, Vennicode, Kerala 695318, India.
authors.forename: Pillai
authors.initials: P
authors.lastname: Arun Gopinathan
authors.affiliation: Oral & Maxillofacial Pathology, Sri Siddhartha Dental College & Hospital, Sri Siddhartha Academy of Higher Education, Tumkur 572107, India.
authors.forename: Ganganna
authors.initials: G
authors.lastname: Kokila
authors.affiliation: Oral & Maxillofacial Pathology, Sri Siddhartha Dental College & Hospital, Sri Siddhartha Academy of Higher Education, Tumkur 572107, India.
authors.forename: Mahadesh
authors.initials: M
authors.lastname: Jyothi
authors.affiliation: Oral & Maxillofacial Pathology, Vananchal Dental College & Hospital, Farathiya, Garhwa, Jharkhand 822114, India.
authors.forename: Chatterjee
authors.initials: C
authors.lastname: Ananjan
authors.affiliation: Oral & Maxillofacial Pathology, Sri Siddhartha Dental College & Hospital, Sri Siddhartha Academy of Higher Education, Tumkur 572107, India.
authors.forename: Linganna
authors.initials: L
authors.lastname: Pradeep
authors.affiliation: Oral & Maxillofacial Pathology, Sri Siddhartha Dental College & Hospital, Sri Siddhartha Academy of Higher Education, Tumkur 572107, India.
authors.forename: Salroo
authors.initials: S
authors.lastname: Humaira Nazir