METHOD DEVELOPMENT ON ANALYSIS CYCLOPHOSPHAMIDE AND 4-HYDROXYCYCLOPHOPHAMIDE IN DRIED BLOOD SPOT AND ITS APPLICATION IN BREAST CANCER PATIENTS

Authors

  • YAHDIANA HARAHAP Bioavailability and Bioequivalence Laboratory, Faculty of Pharmacy, Universitas Indonesia
  • NURLITA GUSTIYANTI Bioavailability and Bioequivalence Laboratory, Faculty of Pharmacy, Universitas Indonesia
  • AYU EGAHMUSTIKA SUNANTO Bioavailability and Bioequivalence Laboratory, Faculty of Pharmacy, Universitas Indonesia
  • HARMITA Bioavailability and Bioequivalence Laboratory, Faculty of Pharmacy, Universitas Indonesia
  • DENNIJOKO PURWANTO Medical Functional Staff Surgical Oncology, “Dharmais” Cancer Hospital, Jakarta, Indonesia

DOI:

https://doi.org/10.22159/ijap.2020v12i4.36092

Keywords:

Cyclophosphamide, 4-OHCP, UPLC-MSMS, DBS, Cancer

Abstract

Objective: To develop the method for the simultaneous analysis of cyclophosphamide and 4-hydroxycyclophosphamide (4-OHCP) in Dried Blood Spot (DBS) using Ultra-High-Performance Liquid Chromatography-Tandem Mass Spectrometry (UPLC-MS/MS) and its application in breast cancer patients for therapeutic drug monitoring.

Methods: Sample preparation used protein precipitation with methanol and acetonitrile (2:1 v/v). The separation was conducted using 1.7μm (2.1 x 100 mm) Waters AcquityTM UPLC C18 column; mobile phase consists of 0.01% formic acid and methanol (50:50 v/v) with isocratic elution, column temperature 30 °C, flow rate 0.3 ml/min and hexamethylphosphoramide (HMP) used as an internal standard. Analysis was performed by a triple quadrupole mass spectrometry with a positive ion mode of Electrospray Ionization. Cyclophosphamide was detected at m/z 260.968>139.978, 4-OHCP at m/z 338.011>224.979, and HMP at m/z 180.17>92.08. The method was applied to quantify cyclophosphamide and 4-OHCP in DBS of breast cancer patients. Blood samples were collected at 2 and 4 h after cyclophosphamide administration for therapeutic drug monitoring.

Results: The method was linear in the range of 50–30.000 ng/ml for cyclophosphamide and 10–1000 ng/ml for 4-OHCP. Lower Limit of Quantification (LLOQ) concentration of cyclophosphamide was 50 ng/ml and 4-OHCP was 10 ng/ml. Accuracy and precision within-run and between-run met the requirements with % diff and CV, not exceeding ±15% and not more than ±20% for LLOQ concentration. The results from DBS samples of cancer patients showed that the level of cyclophosphamide was in the range of 6045.980 ng/ml to 37024.403 ng/ml and 4-OHCP was in the range 33.155 ng/ml to 246.362 ng/ml.

Conclusion: The developed method met the requirements of all validation parameters under the Guideline on Bioanalytical Method Validation by the European Medicines Agency in 2011. Method can be applied on DBS of cancer patients and the results showed that cyclophosphamide and 4-OHCP was detected on 17 samples of breast cancer patients. This can be one of the parameters for therapeutic drug monitoring.

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Published

07-07-2020

How to Cite

HARAHAP, Y., GUSTIYANTI, N., SUNANTO, A. E., HARMITA, & PURWANTO, D. (2020). METHOD DEVELOPMENT ON ANALYSIS CYCLOPHOSPHAMIDE AND 4-HYDROXYCYCLOPHOPHAMIDE IN DRIED BLOOD SPOT AND ITS APPLICATION IN BREAST CANCER PATIENTS. International Journal of Applied Pharmaceutics, 12(4), 119–125. https://doi.org/10.22159/ijap.2020v12i4.36092

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