|Year : 2022 | Volume
| Issue : 4 | Page : 418-422
Correlation of a new binary system in grading of oral leukoplakia for its prediction of malignant transformation - A retrospective record-based study
NC Sangamesh1, Vinay Suresan2, KC Vidya3, Dhirendra K Singh4
1 Department of Oral Medicine and Radiology, Kalinga Institute of Dental Sciences, KIIT DU, Bhubaneswar, Odisha, India
2 Department of Public Health Dentistry, Kalinga Institute of Dental Sciences, KIIT DU, Bhubaneswar, Odisha, India
3 Department of Oral and Maxillofacial Surgery, Kalinga Institute of Dental Sciences, KIIT DU, Bhubaneswar, Odisha, India
4 Department of Periodontolgy, Kalinga Institute of Dental Sciences, KIIT DU, Bhubaneswar, Odisha, India
|Date of Submission||17-Feb-2022|
|Date of Decision||18-Jul-2022|
|Date of Acceptance||28-Nov-2022|
|Date of Web Publication||09-Dec-2022|
N C Sangamesh
Professor and Head Vice Principal, Department of Oral Medicine and Radiology, Kalinga Institute of Dental Sciences, KIIT DU, Bhubaneswar, Odisha
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Introduction: Oral Leukoplakia is a premalignant lesion with an increased risk of developing oral cancer when the lesion is non-homogeneous. There is a need to validate clinical presentations of a commonly occurring Leukoplakia lesion and its probability of dysplastic changes over some time. Aim: To correlate the Diagnostic accuracy of clinical lesion diagnosed as Leukoplakia and the presence or absence of dysplasia through its histopathological correlation. Materials and Methods: This study gathered data retrospectively during 2016–2021 with an initial diagnosis of oral Leukoplakia. A set of 611 slides were included in the study that was signed out as oral Leukoplakia. We tested the hypothesis that a binary grading system categorizes lesions as “presence” or “absence” of oral epithelial dysplasia. A logistic regression analysis was used in predicting the presence of dysplasia among the various clinical criteria. Results: Most of the mild dysplasia was reported in the buccal mucosa (n = 195; 31.91%), followed by 6 (0.98%) cases in the vestibule. A mean age of 32.33 ± 7.0 was observed for severe dysplasia. A statistically significant relationship between the risk estimates for the clinical diagnosis and dysplasia was noted for all the lesion types. Conclusion: The study concludes that the clinical presentation of a lesion can predict the underlying dysplastic changes, and mixed red and white lesions with growth possess the highest risk of malignant transformations.
Keywords: Histopathological correlation, oral epithelial dysplasia, oral leukoplakia, precancerous conditionsKey Message: The current study derives an inference that the clinical presentation of a lesion can predict the underlying dysplastic changes. Therefore, this necessitates the added responsibility of the clinicians to screen the patients carefully, encompass oral pre-malignant lesions, and advise appropriate histopathological investigations.
|How to cite this article:|
Sangamesh N C, Suresan V, Vidya K C, Singh DK. Correlation of a new binary system in grading of oral leukoplakia for its prediction of malignant transformation - A retrospective record-based study. J Indian Acad Oral Med Radiol 2022;34:418-22
|How to cite this URL:|
Sangamesh N C, Suresan V, Vidya K C, Singh DK. Correlation of a new binary system in grading of oral leukoplakia for its prediction of malignant transformation - A retrospective record-based study. J Indian Acad Oral Med Radiol [serial online] 2022 [cited 2023 Feb 2];34:418-22. Available from: http://www.jiaomr.in/text.asp?2022/34/4/418/363037
| Introduction|| |
Oral epithelial dysplasia (OED), not associated with any specific clinical appearance, is a term assigned to the histopathological changes associated with an increased risk of malignant transformation. These potentially malignant lesions show variable clinical presentation.,, Oral carcinomas are associated with leukoplakic lesions. When diagnosed, it showed that oral pre-cancerous lesions preceded about 80% of oral cancers.,,
Oral Leukoplakia is a premalignant lesion that has long been considered to confer an increased risk for the development of oral cancer when the lesion is non-homogeneous., Among these, nodular Leukoplakia is considered a high-risk precancerous lesion, and homogeneous and ulcerated Leukoplakia is a moderate-risk precancerous lesion. In general, it is more or less accepted as an overall statement that approximately 5% of all leucoplakias' will transform into cancer in an average period of 5 years.,
The diagnosis of “Leukoplakia” is never used without the histopathological qualifiers “with dysplasia” or “without dysplasia.” The problems in evaluating the significance of epithelial dysplasia arise from a lack of clarity in the established clinical criteria for predicting malignant potential., There is little conclusive data available about the clinical criteria based on which OED can be diagnosed without histopathological aid. Hence, this investigation was to correlate the Diagnostic accuracy of clinical lesion diagnosed as Leukoplakia and the presence or absence of dysplasia through its histopathological correlation.
| Methodology|| |
This study was conducted and reported by the STARD 2015 Statement for reporting diagnostic accuracy studies. Institutional ethical committee approval was taken (No: KIIT/KIMS/IEC/117/2019). The research was conducted by the guidelines of the Helsinki declaration protecting the subjects' autonomy and confidentiality.
This study gathered data retrospectively from the archives of the Department of Oral Medicine and Radiology, Kalinga Institute of Industrial Technology, Bhubaneswar, Odisha. Sequential cases diagnosed at the original sign-out report during 2016–2021 with an initial diagnosis of oral Leukoplakia were retrospectively reviewed. Eligibility criteria for inclusion were those with available histologically confirmed diagnoses and those with a computerized digital file. A set of 611 slides were included in the study, originally signed out as oral Leukoplakia.
Demographic information of age at the time of diagnosis, gender, site, and clinical presentation of the lesion was recorded. The specific site of occurrence of the lesion was topographically coded according to the International Classification of Diseases-9 (ICD-9) as having occurred in the gingiva, tongue, floor of the mouth, vestibule, retromolar area, palate, buccal mucosa, or lips.
G*Power Software Version 18.104.22.168 was used for sample size calculation.
Input: Tail (s) = Two
|Δ intercept| = 1.3
α err prob = 0.05
Power (1-β err prob) = 0.95
Allocation ratio N2/N1 = 1
Std dev residual σ = 2
Std dev σ_x1 = 4
Std dev σ_x2 = 3
Mean μ_x1 = 5
Mean μ_x2 = 7
Output: Noncentrality parameter δ = 3.6111623
Critical t = 1.9642709
Df = 552
Sample size group 1 = 278
Sample size group 2 = 278
Total sample size = 556
Actual power = 0.9500057
The minimal sample size derived was 556.
Four observers scored the slides. All these were academic staff, Department of Oral and Maxillofacial Pathology, with long experience grading oral dysplastic lesions. No calibration exercises were attempted. Each slide was labeled with a number. No clinical information or patient data were provided with the biopsies. A score sheet was designed for recording grading to aid systematic analysis. The scores for each slide were made after a consensus score was reached on the degree of dysplasia amongst all four oral pathologists. The examiners demonstrated an inter-examiner reliability kappa value of 0.91, indicating very high reliability.
The clinical diagnosis of oral Leukoplakia was based on the criteria provided by Axell T et al., Clinical; a distinction was made between homogeneous and non-homogeneous Leukoplakia; the latter includes erthyroleukoplakia, nodular, exophytic, and proliferative verrucous types. The clinical pictures of all the lesions were graded based on the architecture and cytology criteria for grading epithelial dysplasia according to the WHO classification into the presence or absence of the criteria [Table 1]. The histopathological features (mild, moderate, severe, and carcinoma-in-situ), as given by the pathologist from paraffin sections of pre-treatment biopsies, were blindly and retrospectively re-examined by an expert oral pathologist. The association between the clinical outcomes and the histological assessment scoring was examined.
|Table 1: WHO classification 2005 for architecture and cytology criteria for grading epithelial dysplasia|
Click here to view
We tested the hypothesis that a binary grading system categorizes lesions as “presence” or “absence” of oral epithelial dysplasia. Based on these parameters, the sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), accuracy, and prevalence were calculated for the clinical criteria against the presence or absence of dysplasia. A logistic regression analysis was used in predicting the presence of dysplasia among the various clinical criteria. SPSS (Statistical Package for Social Sciences) version 22 was used. A P value lesser than or equal to 0.05 was considered significant.
| Results|| |
The demographic characteristics of the study population included the overall presentation of the lesions, the mean age at which the dysplastic lesions were commonly noted, and the gender predilection of the lesions. Most of the mild dysplasia was reported in the buccal mucosa (n = 195; 31.91%), followed by 6 (0.98%) cases in the vestibule. There were 81 (13.2%) cases of moderate dysplasia in the buccal mucosa and 12 (1.96%) cases in the tongue. Severe dysplasia was found among 18 (2.94%) cases in the buccal mucosa. There were 54 (8.83%) cases of carcinoma in situ in the buccal mucosa and 12 (1.96%) cases in the retro-molar area. Dysplasia was not present in 222 (36.33%) cases reported in the buccal mucosa and 6 (0.98%) cases reported in the vestibule. A statistically significant difference in the presentation of the lesions was noted (p < 0.0001) [Table 2].
A mean age of 38.96 ± 12.5 was reported for mild dysplasia, 42.94 ± 12.2 for moderate dysplasia, 32.33 ± 7.0 for severe dysplasia, 52.09 ± 8.9 for carcinoma in situ and 39.59 ± 14.2 for no dysplasia. A statistically significant difference was noted (p < 0.0001).
Dysplasia in buccal mucosa was reported among 339 (56.5%) males and 9 (1.5%) females. 12 (2%) males reported dysplasia in the tongue. Dysplasia in the vestibule was reported among 6 (1%) males, and there were 12 (2%) cases with dysplasia in the retromolar area. There was no statistically significant difference.
The present study determined the diagnostic accuracy of the clinical diagnosis with the dysplastic characteristics. Based on the present study also considered a cut-off range of 55% to 100% based on other literature reporters falling in the range was considered important for diagnosing dysplasia.
A comparative dysplasia evaluation with the clinical diagnosis was performed and represented [Table 3]. A statistically significant relationship between the risk estimates for the clinical diagnosis and dysplasia was noted for all the lesion types. Clinical diagnosis and risk estimates was compared which showed highly significant results for Verucous leukoplakia followed by speckled leukoplakia, where as in case of homogenous and nodular leukoplakia the results were significant [Table 4]. ComA comparison of the Dysplasia with the Clinical categories is presented in [Table 5]. Risk estimates for the clinical presentation and Dysplasia have been mentioned in [Table 6]. The inference could be made that mixed red and white with growth was the most presented clinical category to histo-pathologically represent dysplasia.
| Discussion|| |
The present study was conducted to validate clinical presentations of a commonly occurring Leukoplakia lesion and its probability of dysplastic changes over some time. Sivakumar TT et al., have reported oral Leukoplakia as the most common potentially malignant lesion (37.1%). Naga SD et al. have reported that only 12.23% of the OPMLs were referred for biopsies compared to 29.15% of the clinically diagnosed malignant cases. A cover article by ADA has stated Leukoplakia as the commonest OPML, and certain clinically reprehensive erythroplakia histologically reported Oral sub mucous fibrosis. They have reported that not all Leukoplakia lesions present with dysplastic histo-pathological findings even when comparisons are made over a perisome time rationalizes the need for the present study, where effort has been made to predict the dysplastic changes of a lesion based on their clinical presentation.
Warnakulasuriya S has reported buccal mucosa as a common site for Leukoplakia lesions. In a study conducted by Jaber MA et al., it was found that 6.1% of the retromolar area was reported to have dysplastic changes. In contrast to our study findings, Mehrotra R et al., have reported o cases of Leukoplakia in the retromolar area. The higher prevalence of the lesion could be attributed to the increased prevalence of smoking and smokeless tobacco consumption habits among males compared to females.
Mehrotra R et al., this study has reported that Leukoplakia is commonest among the age group of 50 to 59 years. Ray JG et al., have also reported a higher prevalence among the age group 50 to 69. Longitudinal studies have highlighted that long-standing lesions reported dysplastic changes more than just-formed lesions. This could justify the increased prevalence rate of dysplastic changes among middle-aged individuals compared to younger individuals.
Unlike our study report, most authors reported that homogeneous Leukoplakia had a minimal malignant transformation. Parlatescu I et al., have reported that 16% of the non-dysplastic histopathological presentations transform into carcinoma.
The strength of the study includes being one of its kind towards comparing individual clinical presentations and clinical diagnosis correlations with the histopathological dysplastic findings. The weakness of the study, due to the retrospective designs, is that it does not take into account the benefit of surgical intervention of oral epithelial dysplasia in preventing recurrences and malignant development. This study does not include comparisons made with the existing tobacco smoking or chewing habits of the individuals.
A more detailed multi-centric study comparing the patients' habits and the clinical and histopathological correlations is recommended. Concurrently, the results from the current study may also serve as a setting for establishing randomly controlled clinical trials.
| Conclusion|| |
The study derives an inference that the clinical presentation of a lesion can predict the underlying dysplastic changes. This study highlights that mixed red and white lesions with growth possess the highest risk of malignant transformations compared to other clinical presentations. Therefore, this necessitates the added responsibility of the screening clinicians who are supposed to carefully refer the patients for histopathological investigations each time he or she encompasses an OPML.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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