ESTRO 2024 - Abstract Book

S1271

Clinical - Head & neck

ESTRO 2024

Table 1. Observed 3-year loco-regional failure (LRF) rates for different strategies of identifying high risk patients.

Risk

group

definition

Fraction of patients

Observed 3-yr LRF (95% CI)

strategy

High risk: 4 th quartile (>25% risk) Low risk: 1 st -3 rd quartile (0 25% risk)

Multi-endpoint model LRF risk estimate

25%

30% (23-26%)

75%

15% (12-18%)

Stage, UICC8

Stage IV

31%

28% (22-34%)

Stage I-III

69%

15% (12-18%)

Stage, UICC7

Stage IV

63%

22% (18-27%)

Stage I-III

37%

18% (13-23%)

Conclusion: