Abstract
Purpose
Neutropenia is a severe adverse-event of chemotherapeutics. Neutrophils (ANC) are mainly regulated by granulocyte colony stimulating factor (G-CSF). The aim was to characterize the dynamics between endogenous G-CSF and ANC over time following chemotherapy.
Methods
Endogenous G-CSF and ANC were monitored in forty-nine breast cancer patients treated with sequential adjuvant 5-fluorouracil–epirubicin–cyclophosphamide and docetaxel.
Results
During treatment courses ANC was transiently decreased and was reflected in an endogenous G-CSF increase, which was well described by a semi-mechanistic model including control mechanisms; when G-CSF concentrations increased the proliferation rate increased and the bone maturation time reduced for ANC. Subsequently, ANC in the circulation increased leading to increased elimination of G-CSF. Additionally, a non-specific elimination for G-CSF was quantified. The ANC-dependent elimination contributed to 97% at baseline and 49% at an ANC of 0.1 · 109/L to the total G-CSF elimination.
Conclusion
The integrated G-CSF–myelosuppression model captured the initial rise in endogenous G-CSF following chemotherapy-induced neutropenia and the return to baseline of G-CSF and ANC. The model supported the self-regulatory properties of the system and may be a useful tool for further characterization of the biological system and in optimization of chemotherapy treatment.
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Abbreviations
- AAG:
-
Alpha-1 acid glycoprotein
- ALB:
-
Albumin
- ALT:
-
Alanine aminotransferase
- ANC:
-
Absolute neutrophil count
- ANC0 :
-
Baseline neutrophil count
- AP:
-
Alkaline phosphate
- AST:
-
Aspartate aminotransferase
- BSA:
-
Body surface area
- BSV:
-
Between subject variability
- CLCR :
-
Creatinine clearance
- CRP:
-
C-reactive protein
- CV%:
-
Coefficient of variation
- DOSEcort :
-
Amount of cortisol-induced G-CSF release
- FEC:
-
5-flourouracil-epirubicin-cyclophosphamide
- FOCE:
-
First-order conditional estimation method
- G-CSF:
-
Granulocyte colony stimulating factor
- GCSF0 :
-
Baseline G-CSF
- IL-6:
-
Interleukin 6
- kANC :
-
ANC-dependent elimination rate constant
- ke :
-
Non-specific elimination rate constant
- MMT:
-
Mean bone marrow maturation time of neutrophils
- MMTFEC :
-
Mean bone marrow maturation time of neutrophils following FEC treatment
- OFV:
-
Objective function value
- PK:
-
Pharmacokinetics
- PKPD:
-
Pharmacokinetic-pharmacodynamic
- rh-GCSF:
-
Recombinant G-CSF
- RSE:
-
Relative standard error
- SLOPE5-FU :
-
Linear drug effect parameters for 5-FU
- SLOPEcyclo :
-
Linear drug effect parameters for 4-hydroxy cyclophosphamide
- SLOPEdoce :
-
Linear drug effect parameters for docetaxel
- SLOPEepi, :
-
Linear drug effect parameters for epirubicin
- t1/2 circ:
-
Half-life of neutrophils in circulation
- t1/2 cort:
-
Half-life of cortisol-induced G-CSF release
- VPC:
-
Visual predictive check
- 4-OHCP:
-
4-hydroxy cyclophosphamide
- 5-FU:
-
5-flourouracil
- β:
-
Feedback of G-CSF on transit time
- γ:
-
Feedback of G-CSF on neutrophil proliferation
- θMMT-doce :
-
Change in MMT following docetaxel compared to FEC
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ACKNOWLEDGMENTS AND DISCLOSURES
We are grateful to all the patients who kindly participated in the study. We also like to thank Anders Larsson, Åsa Hedlund and Jessica Barrefjord for technical assistance. Model estimation was in part performed on resources provided by Swedish National Infrastructure for Computing (SNIC) through Uppsala Multidisciplinary Center for Advanced Computational Science (UPPMAX). Martin Agback at UPPMAX is acknowledged for assistance concerning technical aspects in making NONMEM run on the UPPMAX resources. The study was supported by the Swedish Cancer Society.
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Quartino, A.L., Karlsson, M.O., Lindman, H. et al. Characterization of Endogenous G-CSF and the Inverse Correlation to Chemotherapy-Induced Neutropenia in Patients with Breast Cancer Using Population Modeling. Pharm Res 31, 3390–3403 (2014). https://doi.org/10.1007/s11095-014-1429-9
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DOI: https://doi.org/10.1007/s11095-014-1429-9