HSPB1 and esophagitis: We found the SNP rs2868371 in HSPB1 associated with oesophagitis CTCAE grade of ≥2 at the 15-week follow-up (HR = 3.72; 95% CI = 1.49–9.25; unadjusted p-value = 0.004; adjusted p-value = 0.083) (Table 2).