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Buijs SM, Braal CL, Buck SAJ, van Maanen NF, van der Meijden-Erkelens LM, Kuijper-Tissot van Patot HA, Hoop EOD, Saes L, van den Boogerd SJ, Struik LEM, van Rossum-Schornagel QC, Mathijssen RHJ, Koolen SLW, Jager A. CBD-oil as a potential solution in case of severe tamoxifen-related side effects. NPJ Breast Cancer 2023; 9:63. [PMID: 37543688 PMCID: PMC10404290 DOI: 10.1038/s41523-023-00570-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 07/21/2023] [Indexed: 08/07/2023] Open
Abstract
Tamoxifen may lead to bothersome side effects contributing to non-compliance and decreased quality of life. Patients searching for relief are increasingly turning to cannabinoids such as CBD-oil. However, CBD-oil might affect tamoxifen pharmacokinetics (PK) through CYP2D6 inhibition. The aims of this open-label, single-arm study were (1) to determine the PK profile of tamoxifen when using CBD-oil, and (2) to subsequently investigate whether CBD-oil has a beneficial influence on side effects. Study patients had to have steady-state endoxifen concentrations ≥16 nM (conservative threshold). PK sampling and side effect assessment was done at initiation of CBD-oil and 28 days thereafter. Bio-equivalence could be concluded if the 90% confidence interval (CI) for the difference in endoxifen AUC fell within the [-20%; +25%] interval. The effect of CBD-oil on side effects was evaluated using the FACT-ES questionnaire. Endoxifen AUC decreased after CBD-oil by 12.6% (n = 15, 90% CI -18.7%, -6.1%) but remained within bio-equivalence boundaries. The endocrine sub-scale of the FACT-ES improved clinically relevant with 6.7 points (n = 26, p < 0.001) and health-related quality of life improved with 4.7 points after using CBD (95% CI + 1.8, +7.6). We conclude that CBD-oil, if of good quality and with a dosage below 50 mg, does not have to be discouraged in patients using it for tamoxifen-related side effects. Clinical trial registration: International Clinical Trial Registry Platform (NL8786; https://www.who.int/clinical-trials-registry-platform ).
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Affiliation(s)
- Sanne M Buijs
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands.
| | - C Louwrens Braal
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Stefan A J Buck
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Noud F van Maanen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | | | | | - Esther Oomen-de Hoop
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Lotte Saes
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | | | - Liesbeth E M Struik
- Department of Internal Medicine, Ikazia Hospital, Rotterdam, The Netherlands
| | | | - Ron H J Mathijssen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Stijn L W Koolen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
- Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Agnes Jager
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
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2
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Kleijburg A, Braal CL, Westenberg JD, Jager A, Koolen SLW, Mathijssen RHJ, Uyl-de Groot CA, Wetzelaer P, Penton H. Health-related quality of life and productivity costs in breast cancer patients treated with tamoxifen in the Netherlands. Biomed Pharmacother 2023; 158:114158. [PMID: 36584427 DOI: 10.1016/j.biopha.2022.114158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Revised: 12/15/2022] [Accepted: 12/21/2022] [Indexed: 12/29/2022] Open
Abstract
The aim of this study was to describe health-related quality of life (HRQoL) and productivity in Dutch breast cancer patients treated with tamoxifen in an adjuvant setting. Patients who started treatment with a standard dose of tamoxifen and who gave written informed consent, were eligible for participation in this trial. A total of 145 patients were asked to complete a survey at 3 months (T1) and 6 months (T2) after initiation of tamoxifen. HRQoL was measured by the EQ-5D-5L and the FACT-B questionnaire, and productivity by using the iMTA Productivity Costs Questionnaire. At 3 months 137 (95%) and at 6 months 133 (92%) patients responded to the surveys. EQ-5D-5 L utility values for T1 and T2 were 0.81 ± 0.17 and 0.81 ± 0.18, respectively. FACT-B scores for T1 and T2 were 109 ± 17.9 and 108 ± 20.0, respectively. No differences in both EQ-5D-5 L utility and FACT-B scores were found between T1 and T2 (p > 0.05). Age and employment status were statistically significantly associated with FACT-B scores (p = 0.04 and p = 0.03, respectively), indicating that younger and unemployed respondents had lower FACT-B scores. Importantly, both short-term and long-term productivity improved during the first six months of tamoxifen treatment (p < 0.05). Here, short-term productivity losses (consisting of absenteeism, presenteeism and unpaid work) for T1 and T2 were estimated at € 855,- and € 396,-, respectively. Long-term productivity losses (consisting of absenteeism) for T1 and T2 were estimated at € 2876,- and € 1104,-, respectively. In conclusion, this study presents HRQoL scores using different instruments and detailed loss of productivity estimates for breast cancer patients treated with adjuvant endocrine therapy. The results presented here can be used to inform input parameters in health economic evaluations of interventions for patients with breast cancer in the Netherlands and other Western countries and ultimately support decision making.
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Affiliation(s)
- Anne Kleijburg
- Erasmus School of Health Policy and Management, Erasmus University, Rotterdam, the Netherlands; CAPHRI School of Public Health and Primary Care, Maastricht University, Maastricht, the Netherlands; Centre of Economic Evaluation & Machine Learning, Trimbos Institute, Netherlands Institute of Mental Health and Addiction, Utrecht, the Netherlands
| | - C Louwrens Braal
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands.
| | - Justin D Westenberg
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Agnes Jager
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Stijn L W Koolen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands; Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Ron H J Mathijssen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Carin A Uyl-de Groot
- Erasmus School of Health Policy and Management, Erasmus University, Rotterdam, the Netherlands; Institute for Medical Technology Assessment, Erasmus University, Rotterdam, the Netherlands
| | - Pim Wetzelaer
- Erasmus School of Health Policy and Management, Erasmus University, Rotterdam, the Netherlands
| | - Hannah Penton
- Erasmus School of Health Policy and Management, Erasmus University, Rotterdam, the Netherlands
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Buijs SM, Hoop EOD, Braal CL, van Rosmalen MM, Drooger JC, van Rossum-Schornagel QC, Vastbinder MB, Koolen SLW, Jager A, Mathijssen RHJ. The impact of endoxifen-guided tamoxifen dose reductions on endocrine side-effects in patients with primary breast cancer. ESMO Open 2023; 8:100786. [PMID: 36753991 PMCID: PMC10024121 DOI: 10.1016/j.esmoop.2023.100786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 01/04/2023] [Accepted: 01/06/2023] [Indexed: 02/09/2023] Open
Abstract
BACKGROUND Tamoxifen is important in the adjuvant treatment of hormone-sensitive breast cancer and substantially reduces recurrence; however, almost 50% of patients are non-compliant mainly due to side-effects. The aim of this study was to investigate whether endoxifen-guided tamoxifen dose reduction could lead to fewer side-effects. MATERIALS AND METHODS Effects of tamoxifen dose reduction were investigated in patients with bothersome side-effects and endoxifen levels ≥32 nM and compared to patients with side-effects who remained on tamoxifen 20 mg. Endocrine symptoms and health-related quality of life (HR-QOL) were assessed after 3 months with the Functional Assessment of Cancer Therapy-Endocrine Symptoms (FACT-ES) questionnaire. RESULTS Tamoxifen dose was reduced in 20 patients, 17 of whom were assessable for side-effect analyses. A clinically relevant improvement of >6 points was observed in endocrine symptoms and HR-QOL in 41% and 65% of the patients, respectively. In total, there was a significant and clinically relevant improvement in endocrine symptoms [5.7, 95% confidence interval (CI) -0.5-11.5] and HR-QOL (8.2, 95% CI 0.9-15.4) after dose reduction. This was not seen in patients whose doses were not reduced (n = 60). In 21% of patients, endoxifen dropped slightly below the 16-nM threshold (12.8, 15.5, 15.8, 15.9 nM). CONCLUSIONS Endoxifen-guided dose reduction of tamoxifen significantly improved tamoxifen-related side-effects and HR-QOL. Nearly 80% of patients remained above the most conservative endoxifen threshold.
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Affiliation(s)
- S M Buijs
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands.
| | - E Oomen-de Hoop
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - C L Braal
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - M M van Rosmalen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - J C Drooger
- Department of Medical Oncology, Breast Cancer Center South Holland South, Ikazia Hospital, Rotterdam, The Netherlands
| | | | - M B Vastbinder
- Department of Internal Medicine, IJsselland Hospital, Capelle aan den Ijssel, Rotterdam, The Netherlands
| | - S L W Koolen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands; Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - A Jager
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - R H J Mathijssen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
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Braal CL, de Knegt RJ, Jager A, Koolen SLW, Mathijssen RHJ, Eechoute K. Tamoxifen use and potential effects on liver parenchyma: A long-term prospective transient elastographic evaluation. Hepatol Commun 2022; 6:2565-2568. [PMID: 35689385 PMCID: PMC9426390 DOI: 10.1002/hep4.2008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 04/30/2022] [Accepted: 05/03/2022] [Indexed: 11/08/2022] Open
Abstract
Tamoxifen is a commonly prescribed drug in both early and metastatic breast cancer. Prospective studies in Asian populations demonstrated that tamoxifen‐related liver steatosis occurred in more than 30% of the patients within 2 years after start of treatment. No well‐designed prospective studies on potential tamoxifen‐related liver steatosis have been conducted in Caucasian patients so far. Therefore, our prospective study aimed to assess the incidence of tamoxifen‐related liver steatosis for a period of 2 years in a population of Caucasian breast cancer patients treated with tamoxifen. Patients with an indication for adjuvant treatment with tamoxifen were included in this study. Data were collected at 3 months (T1) and at 2 years (T2) after start of tamoxifen treatment (follow‐up period of 21 months). For the quantification of liver steatosis, patients underwent liver stiffness measurement by transient elastography with simultaneous controlled attenuation parameter (CAP) determination using the FibroScan. A total of 95 Caucasian breast cancer patients were included in this evaluation. Liver steatosis was observed in 46 of 95 (48%) and 48 of 95 (51%) of the patients at T1 and T2, respectively. No clinically relevant increase in liver steatosis was observed during the treatment period of 2 years with tamoxifen (median CAP = 243 ± 49 dB/m (T1) and 253 ± 55 dB/m (T2), respectively; p = 0.038). Conclusion: In this prospective longitudinal study in Caucasian breast cancer patients, no clinically relevant alterations in liver steatosis in terms of CAP values and liver/lipid parameters were observed after 2 years of tamoxifen treatment. This study therefore demonstrates an absence of tamoxifen‐related adverse events such as steatosis and (early) development of fibrosis or cirrhosis during a treatment period of at least 2 years.
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Affiliation(s)
- C Louwrens Braal
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Robert J de Knegt
- Department of Gastroenterology and Hepatology, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - Agnes Jager
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Stijn L W Koolen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands.,Department of Hospital Pharmacy, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - Ron H J Mathijssen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Karel Eechoute
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands.,Department of Internal Medicine, Gelre Hospital, Zutphen, The Netherlands
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Buck SAJ, Braal CL, Hofman MM, Oomen-de Hoop E, Bruijn PD, Ghobadi Moghaddam-Helmantel IM, Hussaarts KGAM, Vastbinder MB, van Rossum-Schornagel QC, van Schaik RHN, Jager A, Koolen SLW, Mathijssen RHJ. Influence of probenecid on endoxifen systemic exposure in breast cancer patients on adjuvant tamoxifen treatment. Ther Adv Med Oncol 2022; 14:17588359221081075. [PMID: 35321309 PMCID: PMC8935557 DOI: 10.1177/17588359221081075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 01/28/2022] [Indexed: 11/21/2022] Open
Abstract
Introduction: In breast cancer patients treated with the anti-estrogen tamoxifen, low concentrations of the active metabolite endoxifen are associated with more disease recurrence. We hypothesized that we could increase endoxifen concentrations by induction of its formation and inhibition of its metabolism by co-administration of probenecid. Methods: We conducted a crossover study and measured endoxifen concentrations in patients on steady-state tamoxifen monotherapy and after 14 days of combination treatment with probenecid. Eleven evaluable patients were included. Results: Treatment with tamoxifen and probenecid resulted in a 26% increase of endoxifen area under the plasma concentration–time curve from 0 to 24 h (AUC0–24h) compared to tamoxifen monotherapy (95% confidence interval [CI]: 8–46%; p < 0.01), while the maximum observed endoxifen concentration increased with 24% (95% CI: 7–44%; p < 0.01). The metabolic ratio of endoxifen to tamoxifen increased with 110% (95% CI: 82–143%; p < 0.001) after the addition of probenecid. Conclusion: Probenecid resulted in a clinically relevant increase of endoxifen concentrations in breast cancer patients treated with adjuvant tamoxifen. This combination therapy could provide a solution for patients with a CYP2D6-poor metabolizer phenotype or endoxifen concentrations below the threshold despite earlier tamoxifen dose.
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Affiliation(s)
- Stefan A. J. Buck
- Department of Medical Oncology, Erasmus MC Cancer Institute, Doctor Molewaterplein 40, P.O. Box 2040, 3000CA Rotterdam, The Netherlands
| | - C. Louwrens Braal
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Maaike M. Hofman
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Esther Oomen-de Hoop
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Peter de Bruijn
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | | | | | - Mijntje B. Vastbinder
- Department of Internal Medicine, IJsselland Hospital, Capelle aan den IJssel, The Netherlands
| | | | - Ron H. N. van Schaik
- Department of Clinical Chemistry, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Agnes Jager
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Stijn L. W. Koolen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The NetherlandsDepartment of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Ron H. J. Mathijssen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
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6
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Braal CL, Kleijburg A, Jager A, Koolen SLW, Mathijssen RHJ, Corro Ramos I, Wetzelaer P, Uyl-de Groot CA. Therapeutic Drug Monitoring-Guided Adjuvant Tamoxifen Dosing in Patients with Early Breast Cancer: A Cost-Effectiveness Analysis from the Prospective TOTAM Trial. Clin Drug Investig 2022; 42:163-175. [PMID: 35020170 PMCID: PMC8844136 DOI: 10.1007/s40261-021-01114-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/16/2021] [Indexed: 11/24/2022]
Abstract
Background and Objectives Endoxifen is the active metabolite of tamoxifen, and a minimal plasma concentration of 16 nM has been suggested as a threshold above which it is effective in reducing the risk of breast cancer recurrence. The aim of the current analysis was to investigate the cost-effectiveness of therapeutic drug monitoring (TDM)-guided tamoxifen dosing. Methods A cost-effectiveness analysis was performed from a Dutch healthcare perspective, using a partitioned survival model and a lifetime horizon. The reduction in subtherapeutic treatment following TDM is modelled as improved rates of recurrence-free survival (RFS) and overall survival (OS) in comparison to standard tamoxifen treatment. A probabilistic sensitivity analysis (PSA) and a series of scenario analyses were performed to assess the robustness of the results. Results Base-case results estimated a total increase in life years and quality-adjusted life years (QALYs) for TDM of 0.40 and 0.53, respectively. Total costs for TDM and standard tamoxifen treatment are €32,893 and €39,524, respectively. The TDM intervention results in both more QALYs and less healthcare costs, indicating a dominating effect for TDM. The PSA results indicate that the probability of TDM being cost-effective is 92% when using a willingness-to-pay threshold of €20,000. Conclusions TDM-guided dose optimization of tamoxifen is estimated to save costs and increase QALYs for early breast cancer patients.
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Affiliation(s)
- C Louwrens Braal
- Department of Medical Oncology, Erasmus University MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands.
| | - Anne Kleijburg
- Erasmus School of Health Policy and Management, Erasmus University Rotterdam, Rotterdam, The Netherlands.,CAPHRI School of Public Health and Primary Care, Maastricht University, Maastricht, The Netherlands.,Centre of Economic Evaluation and Machine Learning, Trimbos Institute, Netherlands Institute of Mental Health and Addiction, Utrecht, The Netherlands
| | - Agnes Jager
- Department of Medical Oncology, Erasmus University MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Stijn L W Koolen
- Department of Medical Oncology, Erasmus University MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands.,Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Ron H J Mathijssen
- Department of Medical Oncology, Erasmus University MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Isaac Corro Ramos
- Institute for Medical Technology Assessment, Erasmus University Rotterdam, Rotterdam, The Netherlands
| | - Pim Wetzelaer
- Erasmus School of Health Policy and Management, Erasmus University Rotterdam, Rotterdam, The Netherlands
| | - Carin A Uyl-de Groot
- Erasmus School of Health Policy and Management, Erasmus University Rotterdam, Rotterdam, The Netherlands.,Institute for Medical Technology Assessment, Erasmus University Rotterdam, Rotterdam, The Netherlands
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7
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Braal CL, Jager A, Hoop EOD, Westenberg JD, Lommen KMWT, de Bruijn P, Vastbinder MB, van Rossum-Schornagel QC, Thijs-Visser MF, van Alphen RJ, Struik LEM, Zuetenhorst HJM, Mathijssen RHJ, Koolen SLW. Therapeutic Drug Monitoring of Endoxifen for Tamoxifen Precision Dosing: Feasible in Patients with Hormone-Sensitive Breast Cancer. Clin Pharmacokinet 2021; 61:527-537. [PMID: 34786650 PMCID: PMC8975771 DOI: 10.1007/s40262-021-01077-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/19/2021] [Indexed: 02/08/2023]
Abstract
Background Endoxifen is the most important active metabolite of tamoxifen. Several retrospective studies have suggested a minimal or threshold endoxifen systemic concentration of 14–16 nM is required for a lower recurrence rate. The aim of this study was to investigate the feasibility of reaching a predefined endoxifen level of ≥ 16 nM (5.97 ng/mL) over time using therapeutic drug monitoring (TDM). Methods This prospective open-label intervention study enrolled patients who started treatment with a standard dose of tamoxifen 20 mg once daily for early breast cancer. An outpatient visit was combined with a TDM sample at 3, 4.5, and 6 months after initiation of the tamoxifen treatment. The tamoxifen dose was escalated to a maximum of 40 mg if patients had an endoxifen concentration < 16 nM. The primary endpoint of the study was the percentage of patients with an endoxifen level ≥ 16 nM at 6 months after the start of therapy compared with historical data, in other words, 80% of patients with endoxifen levels ≥ 16 nM with standard therapy. Results In total, 145 patients were included. After 6 months, 89% of the patients had endoxifen levels ≥ 16 nM, compared with a literature-based 80% of patients with endoxifen levels ≥ 16 nM at baseline (95% confidence interval 82–94; P = 0.007). In patients with an affected CYP2D6 allele, it was not always feasible to reach the predefined endoxifen level of ≥ 16 nM. No increase in tamoxifen-related adverse events was reported after dose escalation. Conclusion This study demonstrated that it is feasible to increase the percentage of patients with endoxifen levels ≥ 16 nM using TDM. TDM is a safe strategy that offers the possibility of nearly halving the number of patients with endoxifen levels < 16 nM.
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Affiliation(s)
- C Louwrens Braal
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Agnes Jager
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Esther Oomen-de Hoop
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Justin D Westenberg
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Koen M W T Lommen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Peter de Bruijn
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Mijntje B Vastbinder
- Department of Internal Medicine, IJsselland Hospital, Capelle aan den IJssel, The Netherlands
| | | | - Martine F Thijs-Visser
- Department of Internal Medicine, Ikazia Hospital, Rotterdam, The Netherlands.,Department of Internal Medicine, Spijkenisse MC, Spijkenisse, The Netherlands
| | - Robbert J van Alphen
- Department of Internal Medicine, Elisabeth Tweesteden Hospital, Tilburg, The Netherlands
| | - Liesbeth E M Struik
- Department of Internal Medicine, Ikazia Hospital, Rotterdam, The Netherlands
| | | | - Ron H J Mathijssen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Stijn L W Koolen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands. .,Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands.
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8
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Molenaar-Kuijsten L, Braal CL, Groenland SL, de Vries N, Rosing H, Beijnen JH, Koolen SLW, Vulink AJE, van Dongen MGJ, Mathijssen RHJ, Huitema ADR, Steeghs N. Effects of the Moderate CYP3A4 Inhibitor Erythromycin on the Pharmacokinetics of Palbociclib: A Randomized Crossover Trial in Patients With Breast Cancer. Clin Pharmacol Ther 2021; 111:477-484. [PMID: 34674222 DOI: 10.1002/cpt.2455] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 09/27/2021] [Indexed: 11/07/2022]
Abstract
Palbociclib is an oral inhibitor of cyclin-dependent kinases 4 and 6 used in the treatment of locally advanced and metastatic breast cancer, and is extensively metabolized by cytochrome P450 enzyme 3A4 (CYP3A4). A pharmacokinetic/pharmacodynamic relationship between palbociclib exposure and neutropenia is well known. This study aimed to investigate the effects of the moderate CYP3A4 inhibitor erythromycin on the pharmacokinetics of palbociclib. We performed a randomized crossover trial comparing the pharmacokinetics of palbociclib monotherapy 125 mg once daily (q.d.) with palbociclib 125 mg q.d. plus oral erythromycin 500 mg three times daily for seven days. Pharmacokinetic sampling was performed at steady-state for both dosing schedules. Eleven evaluable patients have been enrolled. For palbociclib monotherapy, geometric mean area under the plasma concentration-time curve from zero to infinity (AUC0-24h ), maximum plasma concentration (Cmax ), and minimum plasma concentration (Cmin ) were 1.46 × 103 ng•h/mL (coefficient of variation (CV) 45.0%), 80.5 ng/mL (CV 48.5%), and 48.4 ng/mL (CV 38.8%), respectively, compared with 2.09 × 103 ng•h/mL (CV 49.3%, P = 0.000977), 115 ng/mL (CV 53.7%, P = 0.00562), and 70.7 ng/mL (CV 47.5%, P = 0.000488) when palbociclib was administered concomitantly with erythromycin. Geometric mean ratios (90% confidence intervals) of AUC0-24h , Cmax , and Cmin for palbociclib plus erythromycin vs. palbociclib monotherapy were 1.43 (1.24-1.66), 1.43 (1.20-1.69), and 1.46 (1.30-1.63). Minor differences in adverse events were observed, and only one grade ≥ 3 toxicity was observed in this short period of time. To conclude, concomitant intake of palbociclib with the moderate CYP3A4 inhibitor erythromycin resulted in an increase in palbociclib AUC0-24h and Cmax of both 43%. Therefore, a dose reduction of palbociclib to 75 mg q.d. is rational, when palbociclib and moderate CYP3A4 inhibitors are used concomitantly.
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Affiliation(s)
- Laura Molenaar-Kuijsten
- Department of Pharmacy & Pharmacology, The Netherlands Cancer Institute - Antoni van Leeuwenhoek, Amsterdam, The Netherlands
| | - C Louwrens Braal
- Department of Medical Oncology, Erasmus Medical Center Cancer Institute, Rotterdam, The Netherlands
| | - Stefanie L Groenland
- Department of Clinical Pharmacology, Division of Medical Oncology, The Netherlands Cancer Institute - Antoni van Leeuwenhoek, Amsterdam, The Netherlands
| | - Niels de Vries
- Department of Pharmacy & Pharmacology, The Netherlands Cancer Institute - Antoni van Leeuwenhoek, Amsterdam, The Netherlands
| | - Hilde Rosing
- Department of Pharmacy & Pharmacology, The Netherlands Cancer Institute - Antoni van Leeuwenhoek, Amsterdam, The Netherlands
| | - Jos H Beijnen
- Department of Pharmacy & Pharmacology, The Netherlands Cancer Institute - Antoni van Leeuwenhoek, Amsterdam, The Netherlands.,Department of Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - Stijn L W Koolen
- Department of Medical Oncology, Erasmus Medical Center Cancer Institute, Rotterdam, The Netherlands.,Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Annelie J E Vulink
- Department of Medical Oncology, Reinier de Graaf Gasthuis, Delft, The Netherlands
| | - Marloes G J van Dongen
- Department of Clinical Pharmacology, Division of Medical Oncology, The Netherlands Cancer Institute - Antoni van Leeuwenhoek, Amsterdam, The Netherlands
| | - Ron H J Mathijssen
- Department of Medical Oncology, Erasmus Medical Center Cancer Institute, Rotterdam, The Netherlands
| | - Alwin D R Huitema
- Department of Pharmacy & Pharmacology, The Netherlands Cancer Institute - Antoni van Leeuwenhoek, Amsterdam, The Netherlands.,Department of Clinical Pharmacy, University Medical Center, Utrecht University, Utrecht, The Netherlands.,Department of Pharmacology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
| | - Neeltje Steeghs
- Department of Clinical Pharmacology, Division of Medical Oncology, The Netherlands Cancer Institute - Antoni van Leeuwenhoek, Amsterdam, The Netherlands
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9
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Braal CL, Lam MH, Rienks T, van Tilborg CJ, Heuts W, Heijns JB, Bos MEMM, Mathijssen RHJ, de Bruijn P, Koolen SLW. Quantification of ribociclib in dried blood spots by LC-MS/MS: Method development and clinical validation. J Pharm Biomed Anal 2021; 201:114118. [PMID: 34000578 DOI: 10.1016/j.jpba.2021.114118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 04/28/2021] [Accepted: 05/01/2021] [Indexed: 11/19/2022]
Abstract
A reliable, specific, selective and robust liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for the determination of ribociclib in both dried blood spot (DBS) samples and potassium EDTA plasma. DBS samples were obtained simultaneously with a plasma sample in advanced breast cancer patients treated with ribociclib. A 6 mm disk from the central part of the dried blood spot sample was punched, followed by extraction of ribociclib using liquid-liquid extraction spiked with ribociclib-d6 as internal standard. Concentrations of ribociclib in DBS samples were correlated with corresponding plasma concentrations. From the blood sample also hematocrit was determined. The method was validated for selectivity, sensitivity, precision, lower limit of detection, linearity, stability and accuracy according to the food and drug administration (FDA) guideline. The within- and between-run precisions were ≤10.6 and ≤1.07 %, respectively; while the average accuracy ranged from 100 to 103 %. The influence of hematocrit on validation parameters was tested in the range of 0.20 - 0.40 L/L. No influence of hematocrit on validation parameters was observed. Regression analysis and a Bland-Altman plot indicated correlation between the results obtained from DBS and plasma samples. A strong correlation (R2 >0.97) between DBS samples and plasma concentration from 17 breast cancer patients was found. A number of 12 out of 17 processed DBS samples (71 %) fell inside the acceptable range of 20 % difference of simultaneously obtained plasma samples. The lower limit of quantification in DBS is 10.0 ng/mL and linearity was demonstrated up to 1000 ng/mL. In conclusion, the newly developed assay met the required standard for validation. The methods were used to study ribociclib disposition in patients with advanced breast cancer.
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Affiliation(s)
- C Louwrens Braal
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands.
| | - Mei H Lam
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Tineke Rienks
- Department of Medical Oncology, Medisch Centrum Leeuwarden, Leeuwarden, The Netherlands
| | - Claudia J van Tilborg
- Department of Internal Medicine, Albert Schweitzer Hospital, Dordrecht, The Netherlands
| | - Wendy Heuts
- Department of Internal Medicine, Laurentius Hospital, Roermond, The Netherlands
| | - Joan B Heijns
- Department of Medical Oncology, Amphia Hospital, Breda, The Netherlands
| | - Monique E M M Bos
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Ron H J Mathijssen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Peter de Bruijn
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Stijn L W Koolen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands; Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands
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10
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Braal CL, Jongbloed EM, Wilting SM, Mathijssen RHJ, Koolen SLW, Jager A. Inhibiting CDK4/6 in Breast Cancer with Palbociclib, Ribociclib, and Abemaciclib: Similarities and Differences. Drugs 2020; 81:317-331. [PMID: 33369721 PMCID: PMC7952354 DOI: 10.1007/s40265-020-01461-2] [Citation(s) in RCA: 137] [Impact Index Per Article: 34.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/10/2020] [Indexed: 12/22/2022]
Abstract
The cyclin-dependent kinase (CDK) 4/6 inhibitors belong to a new class of drugs that interrupt proliferation of malignant cells by inhibiting progression through the cell cycle. Three such inhibitors, palbociclib, ribociclib, and abemaciclib were recently approved for breast cancer treatment in various settings and combination regimens. On the basis of their impressive efficacy, all three CDK4/6 inhibitors now play an important role in the treatment of patients with HR+, HER2- breast cancer; however, their optimal use still needs to be established. The three drugs have many similarities in both pharmacokinetics and pharmacodynamics. However, there are some differences on the basis of which the choice for a particular CDK4/6 inhibitor for an individual patient can be important. In this article, the clinical pharmacokinetic and pharmacodynamic profiles of the three CDK4/6 inhibitors are reviewed and important future directions of the clinical applicability of CDK4/6 inhibitors will be discussed.
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Affiliation(s)
- C Louwrens Braal
- Department of Medical Oncology, Erasmus University MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands.
| | - Elisabeth M Jongbloed
- Department of Medical Oncology, Erasmus University MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Saskia M Wilting
- Department of Medical Oncology, Erasmus University MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Ron H J Mathijssen
- Department of Medical Oncology, Erasmus University MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Stijn L W Koolen
- Department of Medical Oncology, Erasmus University MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
- Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Agnes Jager
- Department of Medical Oncology, Erasmus University MC Cancer Institute, Dr. Molewaterplein 40, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
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11
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Braal CL, Hussaarts KGAM, Seuren L, Oomen-deHoop E, de Bruijn P, Buck SAJ, Bos MEMM, Thijs-Visser MF, Zuetenhorst HJM, Mathijssen-van Stein D, Vastbinder MB, van Leeuwen RWF, van Gelder T, Koolen SLW, Jager A, Mathijssen RHJ. Correction to: Influence of green tea consumption on endoxifen steady-state concentration in breast cancer patients treated with tamoxifen. Breast Cancer Res Treat 2020; 185:889. [PMID: 33226493 DOI: 10.1007/s10549-020-05979-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- C Louwrens Braal
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands.
| | - Koen G A M Hussaarts
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Lieke Seuren
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Esther Oomen-deHoop
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Peter de Bruijn
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Stefan A J Buck
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Monique E M M Bos
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | | | | | | | - Mijntje B Vastbinder
- Department of Internal Medicine, IJsselland Hospital, Capelle Aan Den IJssel, The Netherlands
| | - Roelof W F van Leeuwen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands.,Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Teun van Gelder
- Department of Clinical Pharmacy and Toxicology, Leiden University Medical Center, Leiden, The Netherlands
| | - Stijn L W Koolen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands.,Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Agnes Jager
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Ron H J Mathijssen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
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12
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Braal CL, Hussaarts KGAM, Seuren L, Oomen-de Hoop E, de Bruijn P, Buck SAJ, Bos MEMM, Thijs-Visser MF, Zuetenhorst HJM, Mathijssen-van Stein D, Vastbinder MB, van Leeuwen RWF, van Gelder T, Koolen SLW, Jager A, Mathijssen RHJ. Influence of green tea consumption on endoxifen steady-state concentration in breast cancer patients treated with tamoxifen. Breast Cancer Res Treat 2020; 184:107-113. [PMID: 32803636 PMCID: PMC7595994 DOI: 10.1007/s10549-020-05829-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 07/20/2020] [Indexed: 12/16/2022]
Abstract
Background Many cancer patients use additional herbs or supplements in combination with their anti-cancer therapy. Green tea—active ingredient epigallocatechin-3-gallate (EGCG)—is one of the most commonly used dietary supplements among breast cancer patients. EGCG may alter the metabolism of tamoxifen. Therefore, the aim of this study was to investigate the influence of green tea supplements on the pharmacokinetics of endoxifen; the most relevant active metabolite of tamoxifen. Methods In this single-center, randomized cross-over trial, effects of green tea capsules on endoxifen levels were evaluated. Patients treated with tamoxifen for at least 3 months were eligible for this study. After inclusion, patients were consecutively treated with tamoxifen monotherapy for 28 days and in combination with green tea supplements (1 g twice daily; containing 300 mg EGCG) for 14 days (or vice versa). Blood samples were collected on the last day of monotherapy or combination therapy. Area under the curve (AUC0–24h), maximum concentration (Cmax) and minimum concentration (Ctrough) were obtained from individual plasma concentration–time curves. Results No difference was found in geometric mean endoxifen AUC0–24h in the period with green tea versus tamoxifen monotherapy (− 0.4%; 95% CI − 8.6 to 8.5%; p = 0.92). Furthermore, no differences in Cmax (− 2.8%; − 10.6 to 5.6%; p = 0.47) nor Ctrough (1.2%; − 7.3 to 10.5%; p = 0.77) were found. Moreover, no severe toxicity was reported during the whole study period. Conclusions This study demonstrated the absence of a pharmacokinetic interaction between green tea supplements and tamoxifen. Therefore, the use of green tea by patients with tamoxifen does not have to be discouraged.
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Affiliation(s)
- C Louwrens Braal
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands.
| | - Koen G A M Hussaarts
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Lieke Seuren
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Esther Oomen-de Hoop
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Peter de Bruijn
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Stefan A J Buck
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Monique E M M Bos
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | | | | | | | - Mijntje B Vastbinder
- Department of Internal Medicine, IJsselland Hospital, Capelle aan den IJssel, The Netherlands
| | - Roelof W F van Leeuwen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands.,Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Teun van Gelder
- Department of Clinical Pharmacy and Toxicology, Leiden University Medical Center, Leiden, The Netherlands
| | - Stijn L W Koolen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands.,Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Agnes Jager
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
| | - Ron H J Mathijssen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, CN, PO Box 2040, 3015, Rotterdam, The Netherlands
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13
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Braal CL, Beijnen JH, Koolen SL, Oomen-de Hoop E, Steeghs N, Jager A, Huitema AD, Mathijssen RH. Relevance of Endoxifen Concentrations: Absence of Evidence Is Not Evidence of Absence. J Clin Oncol 2019; 37:1980-1981. [DOI: 10.1200/jco.19.00418] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- C. Louwrens Braal
- C. Louwrens Braal, PharmD, Erasmus University Medical Center, Rotterdam, the Netherlands; Jos H. Beijnen, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands, and Utrecht University, Utrecht, the Netherlands; Stijn L.W. Koolen, PhD, PharmD and Esther Oomen-de Hoop, PhD, Erasmus University Medical Center, Rotterdam, the Netherlands; Neeltje Steeghs, MD, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands; Agnes Jager, MD, PhD,
| | - Jos H. Beijnen
- C. Louwrens Braal, PharmD, Erasmus University Medical Center, Rotterdam, the Netherlands; Jos H. Beijnen, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands, and Utrecht University, Utrecht, the Netherlands; Stijn L.W. Koolen, PhD, PharmD and Esther Oomen-de Hoop, PhD, Erasmus University Medical Center, Rotterdam, the Netherlands; Neeltje Steeghs, MD, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands; Agnes Jager, MD, PhD,
| | - Stijn L.W. Koolen
- C. Louwrens Braal, PharmD, Erasmus University Medical Center, Rotterdam, the Netherlands; Jos H. Beijnen, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands, and Utrecht University, Utrecht, the Netherlands; Stijn L.W. Koolen, PhD, PharmD and Esther Oomen-de Hoop, PhD, Erasmus University Medical Center, Rotterdam, the Netherlands; Neeltje Steeghs, MD, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands; Agnes Jager, MD, PhD,
| | - Esther Oomen-de Hoop
- C. Louwrens Braal, PharmD, Erasmus University Medical Center, Rotterdam, the Netherlands; Jos H. Beijnen, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands, and Utrecht University, Utrecht, the Netherlands; Stijn L.W. Koolen, PhD, PharmD and Esther Oomen-de Hoop, PhD, Erasmus University Medical Center, Rotterdam, the Netherlands; Neeltje Steeghs, MD, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands; Agnes Jager, MD, PhD,
| | - Neeltje Steeghs
- C. Louwrens Braal, PharmD, Erasmus University Medical Center, Rotterdam, the Netherlands; Jos H. Beijnen, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands, and Utrecht University, Utrecht, the Netherlands; Stijn L.W. Koolen, PhD, PharmD and Esther Oomen-de Hoop, PhD, Erasmus University Medical Center, Rotterdam, the Netherlands; Neeltje Steeghs, MD, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands; Agnes Jager, MD, PhD,
| | - Agnes Jager
- C. Louwrens Braal, PharmD, Erasmus University Medical Center, Rotterdam, the Netherlands; Jos H. Beijnen, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands, and Utrecht University, Utrecht, the Netherlands; Stijn L.W. Koolen, PhD, PharmD and Esther Oomen-de Hoop, PhD, Erasmus University Medical Center, Rotterdam, the Netherlands; Neeltje Steeghs, MD, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands; Agnes Jager, MD, PhD,
| | - Alwin D.R. Huitema
- C. Louwrens Braal, PharmD, Erasmus University Medical Center, Rotterdam, the Netherlands; Jos H. Beijnen, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands, and Utrecht University, Utrecht, the Netherlands; Stijn L.W. Koolen, PhD, PharmD and Esther Oomen-de Hoop, PhD, Erasmus University Medical Center, Rotterdam, the Netherlands; Neeltje Steeghs, MD, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands; Agnes Jager, MD, PhD,
| | - Ron H.J. Mathijssen
- C. Louwrens Braal, PharmD, Erasmus University Medical Center, Rotterdam, the Netherlands; Jos H. Beijnen, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands, and Utrecht University, Utrecht, the Netherlands; Stijn L.W. Koolen, PhD, PharmD and Esther Oomen-de Hoop, PhD, Erasmus University Medical Center, Rotterdam, the Netherlands; Neeltje Steeghs, MD, PhD, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, the Netherlands; Agnes Jager, MD, PhD,
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14
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Braal CL, Veerman GDM, Peric R, Aerts JGJV, Mathijssen RHJ, Koolen SLW, de Bruijn P. Quantification of the tyrosine kinase inhibitor erlotinib in human scalp hair by liquid chromatography-tandem mass spectrometry: Pitfalls for clinical application. J Pharm Biomed Anal 2019; 172:175-182. [PMID: 31051406 DOI: 10.1016/j.jpba.2019.04.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 04/12/2019] [Accepted: 04/15/2019] [Indexed: 12/17/2022]
Abstract
An LC-MS/MS method was developed and validated to quantify the tyrosine kinase inhibitor erlotinib in human scalp hair, as alternative matrix to monitor long-term erlotinib exposure. Hair samples from 10 lung cancer patients were measured and correlated with plasma concentrations. Hair segments of 1 ± 0.1 cm each were pulverized and for at least 18 h incubated in methanol at ambient temperature. A liquid-liquid extraction purified the extracts and they were analyzed with LC-MS/MS, using erlotinib-d6 as internal standard. The procedure method was validated for selectivity, sensitivity, precision, lower limit of detection, linearity and accuracy. The within and between run precisions including the lower limit of quantification did not exceed 12.5%, while the accuracy ranged from 103 to 106%. A weak correlation between hair and plasma concentration was found (R2 = 0.48). Furthermore, a large inter-individual variability was noted in the disposition of both plasma and hair samples. The highest hair concentrations were observed in black hair compared with other (grey and brown) hair colors. Generally, a linear reduction in hair concentration was found from proximal to distal hair segments. Additional in vitro experiments suggest an accelerated degradation of erlotinib in hair by artificial UV light and also wash-out by shampoo mixtures pretreatment compared with control samples. In conclusion, a reliable and robust LC-MS/MS method was developed to quantify erlotinib in hair. However, clinical and in vitro evaluations showed that the method is not suitable for monitoring long-term erlotinib exposure. The pitfalls of this application outweigh the current benefits.
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Affiliation(s)
- C Louwrens Braal
- Department of Medical Oncology, Erasmus MC Cancer Institute, Erasmus University Medical Center, Rotterdam, the Netherlands.
| | - G D Marijn Veerman
- Department of Medical Oncology, Erasmus MC Cancer Institute, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Robert Peric
- Department of Pulmonary Medicine, Erasmus MC Cancer Institute, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Joachim G J V Aerts
- Department of Pulmonary Medicine, Erasmus MC Cancer Institute, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Ron H J Mathijssen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Stijn L W Koolen
- Department of Medical Oncology, Erasmus MC Cancer Institute, Erasmus University Medical Center, Rotterdam, the Netherlands; Department of Hospital Pharmacy, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Peter de Bruijn
- Department of Medical Oncology, Erasmus MC Cancer Institute, Erasmus University Medical Center, Rotterdam, the Netherlands
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