Background
This study was conducted to compare the histological diagnostic accuracy of conventional oral-based cytology and liquid-based cytology (LBC) methods.
Methods
Histological diagnoses of 251 cases were classified as negative (no malignancy lesion, inflammation, or mild/moderate dysplasia) and positive [severe dysplasia/carcinoma in situ (CIS) and squamous cell carcinoma (SCC)]. Cytological diagnoses were classified as negative for intraepithelial lesion or malignancy (NILM), oral low-grade squamous intraepithelial lesion (OLSIL), oral high-grade squamous intraepithelial lesion (OHSIL), or SCC. Cytological diagnostic results were compared with histology results.
Results
Of NILM cytology cases, the most frequent case was negative [LBC n = 50 (90.9%), conventional n = 22 (95.7%)]. Among OLSIL cytodiagnoses, the most common was negative (LBC n = 34; 75.6%, conventional n = 14; 70.0%). Among OHSIL cytodiagnoses (LBC n = 51, conventional n = 23), SCC was the most frequent (LBC n = 31; 60.8%, conventional n = 7; 30.4%). Negative cases were common (LBC n = 13; 25.5%, conventional n = 14; 60.9%). Among SCC cytodiagnoses SCC was the most common (LBC n = 16; 88.9%, conventional n = 14; 87.5%). Regarding the diagnostic results of cytology, assuming OHSIL and SCC as cytologically positive, the LBC method/conventional method showed a sensitivity of 79.4%/76.7%, specificity of 85.1%/69.2%, false-positive rate of 14.9%/30.7%, and false-negative rate of 20.6%/23.3%.
Conclusions
LBC method was superior to conventional cytodiagnosis methods. It was especially superior for OLSIL and OHSIL. Because of the false-positive and false-negative cytodiagnoses, it is necessary to make a comprehensive diagnosis considering the clinical findings.

Figure 1
This is a list of supplementary files associated with this preprint. Click to download.
Table 1. Histopathological categories. “Others” includes no malignancy, epulis, and mucosel.
Table 2. Results of cytological diagnoses in comparison with histopathological diagnoses
Table 3. Diagnostic accuracy of LBC and conventional methods
Table 4. Diagnostic performance metrics of cytological diagnoses
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Posted 26 Aug, 2020
On 02 Sep, 2020
On 24 Aug, 2020
On 23 Aug, 2020
On 23 Aug, 2020
Received 10 Aug, 2020
On 10 Aug, 2020
On 05 Aug, 2020
Received 20 Jul, 2020
On 10 Jul, 2020
Invitations sent on 02 Jul, 2020
On 25 Jun, 2020
On 24 Jun, 2020
On 17 Jun, 2020
On 15 Jun, 2020
Posted 26 Aug, 2020
On 02 Sep, 2020
On 24 Aug, 2020
On 23 Aug, 2020
On 23 Aug, 2020
Received 10 Aug, 2020
On 10 Aug, 2020
On 05 Aug, 2020
Received 20 Jul, 2020
On 10 Jul, 2020
Invitations sent on 02 Jul, 2020
On 25 Jun, 2020
On 24 Jun, 2020
On 17 Jun, 2020
On 15 Jun, 2020
Background
This study was conducted to compare the histological diagnostic accuracy of conventional oral-based cytology and liquid-based cytology (LBC) methods.
Methods
Histological diagnoses of 251 cases were classified as negative (no malignancy lesion, inflammation, or mild/moderate dysplasia) and positive [severe dysplasia/carcinoma in situ (CIS) and squamous cell carcinoma (SCC)]. Cytological diagnoses were classified as negative for intraepithelial lesion or malignancy (NILM), oral low-grade squamous intraepithelial lesion (OLSIL), oral high-grade squamous intraepithelial lesion (OHSIL), or SCC. Cytological diagnostic results were compared with histology results.
Results
Of NILM cytology cases, the most frequent case was negative [LBC n = 50 (90.9%), conventional n = 22 (95.7%)]. Among OLSIL cytodiagnoses, the most common was negative (LBC n = 34; 75.6%, conventional n = 14; 70.0%). Among OHSIL cytodiagnoses (LBC n = 51, conventional n = 23), SCC was the most frequent (LBC n = 31; 60.8%, conventional n = 7; 30.4%). Negative cases were common (LBC n = 13; 25.5%, conventional n = 14; 60.9%). Among SCC cytodiagnoses SCC was the most common (LBC n = 16; 88.9%, conventional n = 14; 87.5%). Regarding the diagnostic results of cytology, assuming OHSIL and SCC as cytologically positive, the LBC method/conventional method showed a sensitivity of 79.4%/76.7%, specificity of 85.1%/69.2%, false-positive rate of 14.9%/30.7%, and false-negative rate of 20.6%/23.3%.
Conclusions
LBC method was superior to conventional cytodiagnosis methods. It was especially superior for OLSIL and OHSIL. Because of the false-positive and false-negative cytodiagnoses, it is necessary to make a comprehensive diagnosis considering the clinical findings.

Figure 1
This is a list of supplementary files associated with this preprint. Click to download.
Table 1. Histopathological categories. “Others” includes no malignancy, epulis, and mucosel.
Table 2. Results of cytological diagnoses in comparison with histopathological diagnoses
Table 3. Diagnostic accuracy of LBC and conventional methods
Table 4. Diagnostic performance metrics of cytological diagnoses
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