Table 2.
Reason for exclusion of articles
| Study | Reason for exclusion |
|---|---|
| Satgunaseelan et al. (2016)[11] | Only histopathological assessment of DOI was performed |
| Brockhoff et al. (2017)[12] | Only histopathological assessment of DOI was performed |
| Almangush et al. (2018)[13] | Only histopathological assessment of DOI was performed |
| Mascitti et al. (2018)[15] | Only histopathological assessment of DOI was performed |
| Masood et al. (2018)[16] | Only histopathological assessment of DOI was performed |
| Amit et al. (2019)[17] | Only histopathological assessment of DOI was performed |
| Berdugo et al. (2019)[18] | Only histopathological assessment of DOI was performed |
| Chatterjee et al. (2019)[19] | Only histopathological assessment of DOI was performed |
| Ebrahimi et al. (2019)[21] | Only histopathological assessment of DOI was performed |
| Hasmat et al. (2019)[22] | Only histopathological assessment of DOI was performed |
| Kozak et al. (2019)[23] | Only histopathological assessment of DOI was performed |
| Tam et al. (2019)[24] | Only histopathological assessment of DOI was performed |
| Toom et al. (2019)[25] | Only histopathological assessment of DOI was performed |
| Zenga et al. (2019)[26] | Only histopathological assessment of DOI was performed |
| Bjerkli et al. (2020)[27] | Only histopathological assessment of DOI was performed |
| Larson et al. (2020)[28] | Only histopathological assessment of DOI was performed |
| Sahoo et al (2020)[30] | Only histopathological assessment of DOI was performed |
| Shin et al. (2020)[31] | Only histopathological assessment of DOI was performed |
| Aaboubout et al. (2021)[33] | Only histopathological assessment of DOI was performed |
| D’Cruz et al. (2021)[34] | Only histopathological assessment of DOI was performed |
| Lau et al. (2021)[36] | Only histopathological assessment of DOI was performed |
| Muhammad et al. (2021)[37] | Only histopathological assessment of DOI was performed |
| Salama et al. (2021)[39] | Only histopathological assessment of DOI was performed |
| Tandon et al. (2022)[41] | Only histopathological assessment of DOI was performed |
| Cho et al. (2019)[20] | MRI not used for DOI assessment |
| Locatello et al. (2020)[29] | Computed tomography used for DOI assessment |
| Chin et al. (2021)[35] | Computed tomography used for DOI assessment |
| Yoon et al. (2020) [32] | Compared sonography to histopathological DOI |
| Iida et al. (2018)[14] | Ultrasonography was used for DOI assessment |
| Rocchetti et al. (2021)[38] | Ultrasonography was used for DOI assessment |
| Hiyama et al. (2022) [40] | Used CT for DOI assessment |
| Ng et al. (2016)[42] | Oropharyngeal or hypopharyngeal carcinoma |
| Padma et al. (2017)[43] | Buccal mucosa carcinoma |
| Gencturk et al. (2019)[44] | Sinonasal carcinoma |
| Pillai et al. (2019)[45] | Buccal mucosa carcinoma |
| Soni et al. (2019)[46] | Carcinoma of gingiva–buccal complex |
| Kim et al. (2020)[47] | Tonsillar cancer |
| Marinelli et al. (2020)[48] | Buccal mucosa carcinoma |
| Joo et al. (2020)[49] | Carcinoma of tonsil |
| Baba et al. (2021)[51] | Carcinoma of floor of the mouth |
| Baba et al. (2021)[50] | Buccal mucosa carcinoma |
| Jain et al. (2021)[52] | Laryngeal carcinoma |
| Kosugi et al. (2021)[53] | Maxillary sinus cancer |
| Tokat et al. (2021)[54] | Larynx cancer |
| Chen et al. (2022)[55] | Hypopharyngeal squamous cell carcinoma |
| Wang et al. (2022)[56] | Buccal mucosa carcinoma |
| Ren et al. (2018)[58] | Lacking statistical details |
| Dang et al. (2019)[57] | Lacking statistical details |
| de Koning et al. (2019)[59] | Lacking statistical details |
| Morand et al. (2019)[60] | Lacking statistical details |
| Jani et al. (2020)[61] | Lacking statistical details |
| Jović et al. (2020)[62] | Lacking statistical details |
| Kanno et al. (2020)[63] | Lack of statistical details |
| Filauro et al. (2021)[64] | Lacking statistical details |
| Harada et al. (2021)[65] | Lacking statistical details |
| Waech et al. (2021)[66] | Lacking statistical details |
| Kouketsu et al. (2016)[67] | MRI used for non-DOI purpose |
| Howe et al. (2017)[68] | MRI used for non-DOI purpose |
| Faraji et al. (2018)[69] | MRI used for non-DOI purpose |
| Han et al. (2018)[70] | MRI used for non-DOI purpose |
| Martens et al. (2019)[71] | MRI used for non-DOI purpose |
| Meyer et al. (2021)[72] | MRI used for non-DOI purpose |
| Shah et al. (2021)[73] | MRI used for non-DOI purpose |
| Kwon et al. (2016)[80] | MRI used for tumor thickness |
| Tsushima et al. (2016)[79] | MRI used for tumor thickness |
| Imai et al. (2017)[77] | MRI used for tumor thickness |
| Smiley et al. (2019)[78] | MRI used for tumor thickness |
| Noorlag et al. (2020)[76] | MRI used for tumor thickness |
| Park et al. (2021)[74] | MRI used for tumor thickness |
| Saenthasuk et al. (2021)[75] | MRI used for tumor thickness |
| Sahin et al. (2016)[81] | Not comparing MRI-measured DOI |
| Faisal et al. (2018)[82] | Not comparing MRI-measured DOI |
| Baik et al. (2019)[83] | Not comparing MRI-measured DOI |
| Minamitake et al. (2021)[84] | Not comparing MRI-measured DOI |
| Papoutsaki et al. (2021)[85] | Not comparing MRI-measured DOI |
| Zhang et al. (2022)[86] | Article ahead of print |
Legend: DOI: depth of invasion; MRI: magnetic resonance imaging; CT: computed tomography