Open Access
Table I
Summary of characteristics of included studies.
| Characteristics of studies | N studies |
|---|---|
| Year of publication | |
| 2014 | 5 |
| 2015 | 13 |
| 2016 | 6 |
| 2017 | 6 |
| 2018 | 4 |
| 2019 | 2 |
| Type of study | |
| Case control | 30 |
| Transverse | 5 |
| Cohort study | 1 |
| Concentrations | |
| Salivary | 36 |
| Blood | 11 |
| Tissue | 3 |
| Population | |
| Healthy | 36 |
| Having other types of benign lesions | 1 |
| Having a pre-cancerous lesion | 16 |
| Having a cancerous lesion | 36 |
| Mean of patients by studies ± SD | |
| Healthy pop | 35 ± 21 |
| Having other types of benign lesions pop | 20 ± − |
| Having a pre-cancerous lesion pop | 41 ± 39 |
| Having a cancerous lesion pop | 43 ± 26 |
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