Table 1.

Information regarding the sources of the reviewed cases of actinic cheilitis (AC) and lip squamous cell carcinoma (LSCC)

Centre	State	Population (million)	Period	Number of biopsied lesions	AC (n)	AC (%)a	LSCC (n)	LSCC (%)
UFPAb	Pará	8,513,497	2007–2018	5689	25	0.4	19	0.3
UFRNc	Rio Grande do Norte	3,479,010	1990–2018	12,528	207	1.6	43	0.3
UEPBd	Paraíba	3,996,496	2011–2018	3112	83	2.7	26	0.8
UPEe	Pernambuco	9,496,294	1990–2018	6911	42	0.6	11	0.2
UFRGSf	Rio Grande do Sul	11,329,605	1994–2018	NAl	125	-m	197	-m
UFPelg	Rio Grande do Sul	11,329,605	1968–2018	24,910	218	0.9	341	1.4
UFMGh	Minas Gerais	21,040,662	1953–2018	37,363	200	0.5	113	0.3
UFRJi	Rio de Janeiro	17,159,960	1979–2018	15,232	75	0.5	65	0.4
USPj	São Paulo	12,176,866	1991–2018	82,406	965	1.2	NAn	–o
UFGk	Goiás	6,921,161	1999–2018	10,558	77	0.7	35	0.3
Total	–	–	–	198,709	2017	1.0	850	0.4

^aPercentage of the whole sample

^bService of Oral Pathology, Hospital Universitário João de Barros Barreto, Universidade Federal do Pará (North region)

^cPostgraduate Program in Oral Pathology, Universidade Federal do Rio Grande do Norte (North-East region)

^dDepartment of Dentistry, School of Dentistry, Universidade Estadual da Paraíba (North-East region)

^eDepartment of Oral and Maxillofacial Surgery and Pathology, School of Dentistry, Universidade de Pernambuco (North-East region)

^fDepartment of Oral Medicine, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul (South region)

^gDiagnostic Centre for Oral Diseases, School of Dentistry, Universidade Federal de Pelotas (South region)

^hDepartment of Oral Surgery and Pathology, School of Dentistry, Universidade Federal de Minas Gerais (South-East region)

ⁱDepartment of Oral Diagnosis and Pathology, School of Dentistry, Universidade Federal do Rio de Janeiro (South-East region)

^jDepartment of Oral and Maxillofacial Pathology, School of Dentistry, Universidade de São Paulo (South-East region)

^kDepartment of Stomatology (Oral Pathology), School of Dentistry, Universidade Federal de Goiás (Mid-East region)

^lData were not available (NA) because they were from a primary centre; therefore, lesions affecting the maxillofacial region were not separated from the others

^mData not calculated due to the absence of the total number of biopsied lesions

ⁿData about this lesion were not collected at this centre

^oData not calculated due to the absence of the number of LSSC lesion