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Table 1 Characteristics of Patients and Treatments

From: Treatment outcomes of proton or carbon ion therapy for skull base chordoma: a retrospective study

Characteristics   n %
Total   24  
Age, Median year (range) 55.5 (24–79)  
ECOG PS 0/1 21/3 88/12
Gender Male/female 10/14 42/58
Tumour status Primary/ postsurgical recurrence 17/7 71/29
Surgical intervention before PT or CIT No/yes 10/14 42/58
Ion type PT/CIT 11/13 46/54
GTV volume Median ml (range) 17.0 (0.4–113.1)  
Total dose/ fractionation 57.6 Gy (RBE) / 16fr 1 4
60.8 Gy (RBE) / 16fr 2 8
65.0 Gy (RBE) / 26fr 13 54
70.2 Gy (RBE) / 26fr 3 13
70.4 Gy (RBE) / 32fr 3 13
74.0 Gy (RBE) / 37fr 2 8
GTV Dmina Median Gy (RBE) (range) 55.0 (7.1–86.1)  
  1. PT proton therapy, CIT carbon ion therapy, GTV gross target volume, Dmin minimum dose
  2. aMinimum dose of GTV was standardised as equivalent dose in 2Gy with α/β = 2 using LQ model