“…Studies addressing genetic markers such as single nucleotide polymorphisms (SNPs) in the context of oral mucositis in oncopaediatric patients have already been conducted in China (Lu et al, 2021), the Netherlands (Den Hoed et al, 2015; Gutierrez‐Camino et al, 2017; Oosterom, Berrevoets, et al, 2018), Mexico (Ruiz‐Argüelles et al, 2007) and Turkey (Bektaş‐Kayhan et al, 2012), among others. We are the only group to date to conduct studies of this nature in Brazil (Coêlho et al, 2022; Viana Filho et al, 2021). The genes investigated in these studies comprise genes involved in inflammation, oxidative stress, membrane proteins related to drug resistance, MTX® metabolism and micro‐RNAs.…”