Table 2 Mean AEA Ctrough after the first four doses of PEG-asparaginase in the different groups.

From: Increase in peg-asparaginase clearance as a predictor for inactivation in patients with acute lymphoblastic leukemia

 

AEA Ctrough IU/L

No inactivation

Inactivation

 

IV

IM

IM and IV

IV

IM

Dose

AEA (samples, n) Patients = 184

AEA (samples, n) Patients = 24

AEA (samples, n) Patients = 45

AEA (samples, n) Patients = 42

AEA (samples, n) Patients = 2

AEA (samples, n) Patients = 1

 

<16 years

≥16 years

1 < 16 years ≥23

 

<16 years

≥16 years

<16 years

1

322 IU/L (156)

168 IU/L (18)

142 IU/L (22)

295 IU/L (43)

301 IU/L (40)

70 IU/L (2)

487 IU/L (1)

2

413 IU/L (142)

189 IU/L (13)

199 IU/L (17)

193 IU/L (38)

203 IU/L (36)

0 IU/L (1)

0 IU/L (1)

3

440 IU/L (130)

270 IU/L (15)

210 IU/L (11)

94 IU/L (26)

94 IU/L (26)

 

4

523 IU/L (73)

197 IU/L (6)

164 IU/L (8)

0 IU/L (10)

0 IU/L (9)

0 IU/L (1)

 
  1. Inactivation group: 44 patients were treated with IV PEG-asparaginase; 42 patients were <16 years (1500 IE/m2/dose), and two patients were ≥16 years (1000 IE/m2/dose) and one patient had PEG-asparaginase IM (age <16 years).
  2. No inactivation group: 184 patients were treated with IV PEG-asparaginase; 165 patients were <16 years (1500 IE/m2/dose), and 19 patients were ≥16 years (1000 IE/m2/dose). 24 patients were treated with IM PEG-asparaginase; 1 patient was <16 years (1500 IE/m2/dose) and 23 patients were ≥16 years (1000 IE/m2/dose).