Table 2.

Assessment of IgRT in patients with MM

Patients with ≥1 IgRT 
n = 471
Number of IgRTs administered  
Mean ± SD 5.0 ± 13.0 
Median (IQR) 2.0 (1.0-4.0) 
Range (1-198) 
n (%)  
214 (45.4) 
78 (16.6) 
45 (9.6) 
28 (5.9) 
23 (4.9) 
11 (2.3) 
9 (1.9) 
≥8 63 (13.4) 
Patients with 1 IgRT, n (%) 214 (45.4) 
Time from MM diagnosis to IgRT initiation, mo  
Mean ± SD 38.0 ± 31.4 
Median (IQR) 32.2 (10.2-58.4) 
Time from IgRT initiation to end of follow-up, mo  
Mean ± SD 34.3 ± 32.5 
Median (IQR) 23.5 (6.0-51.8) 
Year of first IgRT, n (%)  
2010-2015 21 (9.8) 
2016-2020 130 (60.7) 
2021-2023 63 (29.4) 
Patients with ≥2 IgRTs, n (%) 257 (54.6) 
Time from MM diagnosis to IgRT initiation, mo  
Mean ± SD 35.1 ± 31.7 
Median (IQR) 24.5 (10.5-53.5) 
Time from IgRT initiation to end of follow-up, mo  
Mean ± SD 38.6 ± 27.5 
Median (IQR) 30.7 (16.9-60.7) 
Time from first IgRT to second IgRT, mo  
Mean ± SD 6.2 ± 10.7 
Median (IQR) 3.1 (0.9-6.5) 
Year of first IgRT, n (%)  
2010-2015 35 (13.6) 
2016-2020 141 (54.9) 
2021-2023 81 (31.5) 
Patients with ≥1 IgRT 
n = 471
Number of IgRTs administered  
Mean ± SD 5.0 ± 13.0 
Median (IQR) 2.0 (1.0-4.0) 
Range (1-198) 
n (%)  
214 (45.4) 
78 (16.6) 
45 (9.6) 
28 (5.9) 
23 (4.9) 
11 (2.3) 
9 (1.9) 
≥8 63 (13.4) 
Patients with 1 IgRT, n (%) 214 (45.4) 
Time from MM diagnosis to IgRT initiation, mo  
Mean ± SD 38.0 ± 31.4 
Median (IQR) 32.2 (10.2-58.4) 
Time from IgRT initiation to end of follow-up, mo  
Mean ± SD 34.3 ± 32.5 
Median (IQR) 23.5 (6.0-51.8) 
Year of first IgRT, n (%)  
2010-2015 21 (9.8) 
2016-2020 130 (60.7) 
2021-2023 63 (29.4) 
Patients with ≥2 IgRTs, n (%) 257 (54.6) 
Time from MM diagnosis to IgRT initiation, mo  
Mean ± SD 35.1 ± 31.7 
Median (IQR) 24.5 (10.5-53.5) 
Time from IgRT initiation to end of follow-up, mo  
Mean ± SD 38.6 ± 27.5 
Median (IQR) 30.7 (16.9-60.7) 
Time from first IgRT to second IgRT, mo  
Mean ± SD 6.2 ± 10.7 
Median (IQR) 3.1 (0.9-6.5) 
Year of first IgRT, n (%)  
2010-2015 35 (13.6) 
2016-2020 141 (54.9) 
2021-2023 81 (31.5) 

IgRT use was assessed during the follow-up period.

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