GSTM1 and nasopharyngeal carcinoma: In a study conducted by Yilmaz et al. [11], it was demonstrated that among 263 patients with LA-NPC, those with low pretreatment hemoglobin (Hb) levels (Hb ≤ 10.6 g/dL) had a higher incidence of tooth extraction following C-CRT compared to those with high Hb levels (83.9% vs. 78.1% for Hb > 10.6 g/dL; p < 0.001).