Table 2 Cox regression analysis on potentially prognostic factors and their impact on overall and progression-free survival, n = 20, HR = hazard ratio

OS

PFS

Age

1.24 (0.31)

1.04 (0.40)

Sex

0.00 (0.81)

0.55 (0.63)

PTV_hom/extended volume

0.00 (0.38)

0.03 (0.35)

SIB vs. Non-SIB

0.03 (0.58)

0.6 (0.66)

Size of PTV

1.00 (0.63)

1.00 (0.40)

Simpson grade

0.25 (0.58)

1.06 (0.90)

Histology (°II vs. °III)

2.24 (0.57)

1.82 (0.61)

Type of resection (total vs. subtotal/biopsy)

0.01 (0.58)

0.92 (0.90)

Timing of RT (immediately vs. after ≥1 recurrence)

3.54 (0.38)

4.4 (0.22)

SUV_max (DOTATATE-PET)

0.98 (0.88)

1.15 (0.09)