Comparison of oral candidiasis characteristics in head-and-neck cancer patients before and during radiotherapy

Patients undergoing head-and-neck radiotherapy are susceptible to colonization and infection. This study aimed to identify oral species type (ST), colony count (CC), and oropharyngeal candidiasis (OPC) in head-and-neck cancer patients, undergoing radiotherapy, before and 2 weeks after radiation. In this quasi-experimental study, head-and-neck cancer patients undergoing radiotherapy (up to 6000 cGy) were recruited. Samples were taken before and 2 weeks after radiation therapy (RT). CC was assigned using Sabouraud dextrose agar culture medium and morphological studies were performed to confirm OPC. For identification, polymerase chain reaction-restriction fragment length polymorphism was performed. Data were analyzed using Chi-square-test and kappa coefficient. < 0.05 was considered statistically significant. Twenty-one of 33 patients were positive. The detected fungal species included (60%), (22%), (9%), and other species (9%). Following RT, OPC and CC changed significantly ( = 0.003 and = 0.001, respectively), whereas ST did not significantly change ( = 0.081). Two new species ( and ) were detected after the intervention. The OPC, CC, and ST changes after RT were not significantly related to malignancy site or radiation dose ( > 0.05). The present study showed that OPC, CC, and ST were not related to the malignancy site. Following RT, OPC and CC changed significantly, while ST showed no significant change. The radiation dose and malignancy site had no effects on the OPC, CC, or ST alterations following RT.