“…In some cases, carcinomas will occur following the occurrence of OKs. According to the literature, the frequency of NBCCS has been reported to be 1 in 50,000 to 150,000 in general population ( Khodaverdi et al, 2018 , Kumar et al, 2018 , Santander et al, 2018 , Al-Jarboua et al, 2019 , Bartos et al, 2019 , Boos Lima et al, 2019 , Moramarco et al, 2019 , Nilius et al, 2019 , Sahu et al, 2019 , Cesinaro et al, 2020 , Lata and Kaur, 2020 , Silva et al, 2020 , Gao et al, 2021 , Rafiq et al, 2021 , Singh and Mishra, 2021 , de Lima et al, 2022 , Katayama et al, 2022 , Pazdera et al, 2022 , Pitak-Arnnop et al, 2022 , Rao and Taksande, 2022 , Reaz et al, 2022 , Spadari et al, 2022 ).…”