Immunohistochemical expression of putative cancer stem cell markers aldehyde dehydrogenase 1, SOX2, CD44 and OCT4 in different grades of oral epithelial dysplasia

Objectives

The hypothesized existence of cancer stem cells (CSC) and its markers aldehyde dehydrogenase 1 (ALDH1), CD44, SOX2 and OCT4 in oral dysplastic tissues provides the potential for a more reliable assessment of malignant transformation of oral epithelial dysplasia (OED). Thus, the present study is intended to evaluate the immunohistochemical expression of four different CSC markers ALDH1, CD44, SOX2 and OCT4 in different grades of OED and to investigate the co-expression of these putative stem cell markers in OED.

Subjects and Methods

A total of 35 samples of varying grades of OED which included 7 mild, 11 moderate and 17 severe dysplasia samples and 10 samples of normal oral mucosa without dysplasia were used. Four sections each from all 45 samples were stained with ALDH1, CD44, SOX2 and OCT4, respectively, by immunohistochemistry. The acquired data were analyzed and evaluated using the Chi-square test and unpaired t-test and the P < 0.05 was taken significant.

Results

ALDH1 and SOX2 expression percentages showed statistically significant differences among study groups (P < 0.05). Statistical comparison of percentage expression of CD44 and OCT4 between OED and normal was nonsignificant (P > 0.05). Co-expression of all four markers was found in 15 cases of OED with none of the normal cases showing co-expression.

Conclusion

The expression of CSC markers in OED and normal mucosa differs significantly with co-expression of all four markers located only in dysplastic tissues. Until now, no single protein marker has been able to unequivocally identify the CSCs. Thus, a panel of putative CSC markers will help in identifying the patients with high risk for malignant transformation in OED.

The Pandemic Impact of COVID 19 on Orthodontic Practice: A Cross Sectional Study

AIM

The objective of this study was to determine the problem encountered by an orthodontist due to suspended treatment during and after lockdown COVID 19 and to assess the pandemic impact on orthodontic practices.

MATERIALS AND METHODS

This was a cross-sectional web-based questionnaire survey conducted among orthodontist in India. The pilot study was conducted to estimate the sample size and final sample size is 263 participants. The predesigned and validated, self-administered, structured 10 questions related to the impact of an orthodontist and their orthodontic practices during and after COVID 19 are used. The statistical analysis was done using Statistical Package for Social Sciences SPSS (V 22.0) the frequency distribution was computed.

RESULTS

The result showed that 81% orthodontist were reported that routine orthodontic treatment was disturbed due to this COVID 19 lockdown, about 79.1% reported hospital/clinic was closed due to lockdown with a duration of more than 1 month. Still, 64.6% orthodontist handling their orthodontic emergencies through telecommunication and 47.9% of orthodontist received a complaint about fixed appliance among all other appliances. Due to the current situation, 41.4% orthodontist suggested 3-6 months' period required to normalize the current situation and 66.9% agreed that there will be decline in orthodontic treatment need after COVID 19.

CONCLUSION

Owing to the high virulence activity, elective procedures have been postponed and can manage a patient through virtual teleconsultation. Reassurance of the patient is needed regarding prolonged treatment duration due to this COVID 19 pandemic.