Pharmacokinetics of metronomic chemotherapy
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Pharmacokinetics of metronomic chemotherapy
Divisione di Farmacologia Dipartimento di Medicina Clinica and Sperimentale Università di Pisa U.O. Farmacologia Clinica Azienda Ospedaliero Universitaria Pisana Pharmacokinetics, pharmacodynamics and pharmacogenetics of metronomic chemotherapy Bocci Guido Cancer Metronomic Therapy – AIOM Meeting Milan ‐ February 26th 2016 Metronomic chemotherapy: a new PK/PD definition “Indeed, metronomic chemotherapy may be better defined as a frequent, regular administration of drug doses designed to maintain low, but active, range of concentrations of chemotherapeutic drugs during prolonged periods of time without inducing excessive toxicities.” Bocci & Kerbel. Nat Rev Clin Oncol 2016 in press Pharmacokinetics of metronomic chemotherapy: the neglected part of the story Despite more than 10 years of clinical studies on metronomic chemotherapy, very few clinical pharmacokinetic data are currently available WHY ? methodological issues such as long‐term sampling, availability of proper detecting methods (e.g. 4‐OH‐CTX), combinations of drugs the underestimation of the importance of the relationship between plasma/tumor concentrations of metronomic drugs (and their active metabolites) and clinical activity Pharmacokinetics: a key aspect for the development of metronomic concept The pharmacokinetic knowledge about metronomic chemotherapy regimens is essential to determine: 1. a dose schedule that reaches an active concentration of drug 2. the main mechanisms of action involved in the success of metronomic chemotherapy at a specific range of drug concentrations in plasma 3. pharmacodynamic markers in oncology patients for such drug concentrations 4. any possible pharmacokinetic interactions (positive or negative) with other drugs, such as tyrosine kinase inhibitors or therapeutic antibodies Metronomic cyclophosphamide PK /PD Metronomic daily oral dose: 20 mg/kg Emmenegger et al. Mol Cancer Ther 2007;6:2280 Antiangiogenic activity ↓ number of vessels in matrigel plug ↓ number of viable CEP Intermittent metronomic schedule: 140 mg/kg every 6 days Activation of antitumor innate immunity ↑ number of macrophages, dendritic cells and NK cells Chen CS et al. Neoplasia 2014;16: 84 Dendritic cells NK cells Metronomic cyclophosphamide PK/PD ‐ II Standard dose 600 mg/m2 i.v. Cmax 31.4±5.4 µg/ml Goodman & Gilman 2015 Daily oral dose CTX 50 mg CTX Cmax 2.01 µg/ml Antiangiogenic activity ↓ number of vessels CD31+ ↓ expression of VEGF Bazzola et al. Br J Cancer 2015;112: 52 Breast cancer No available data about the active metabolites of cyclophosphamide (e.g. 4‐OH‐ CTX) and description of PK only after a single dose Metronomic cyclophosphamide PK/PD ‐ III Daily oral dose CTX 50 mg Antiangiogenic activity Fontana et al. Clin Cancer Res 2009,15:4954 Calleri et al. Clin Cancer Res 2009,15: 7652 Prostate cancer Responder patients had lower VE‐ cadherin expression Breast cancer Patients with lower VEGF levels after 2 mo of treatment had higher PFS Metronomic cyclophosphamide PK/PD ‐ IV Intermittent metronomic schedule Cyclophosphamide 100 mg/day, 1 week on and 1 week off CTX and 4‐OH‐CTX concentrations ? Pharmacokinetics of metronomic oral vinorelbine Standard dose 30 mg/m2 i.v. → Cmax 1130±636 ng/ml Leveque et al. Clin Pharmacokinet 1996,31: 184 vinorelbine displayed linear pharmacokinetics Briasoulis et al. Clin Cancer Res 2009;15:6454 Briasoulis E et al. BMC Cancer 2013;13:263 the blood Css for vinorelbine was attained after 14 days of treatment, and this compound did not show any evidence of accumulation during months of successive treatment 0.4 0.2 0 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 time (h) N 30000 25000 20000 15000 * 10000 *P=0.0063 Bocci et al. 2016 unpublished data on N R es p Vinorelbine 30 mg p.o. three times a week in prostate cancer patients R ↓ plasma VEGF ↑ plasmaTSP‐1 0.0 P<0.0001 re sp 0.6 5000 on 0.8 * 10000 re sp Antiangiogenic activity 15000 es p 1.0 AUC 0-28 TSP1 [day ng/ml] VNR plasma levels [ng/ml] Day 28 AUC 0-28 VEGF [day ng/ml] Metronomic oral vinorelbine PK/PD ‐ I 130 0.8 Non Responders 120 110 100 90 0 Immunological‐ mediated mechanism ? 1.0 Days 0.6 PFS (B7H3 concentration at day 28) 0.4 100 80 B7H3 < 30.25 pg/ml B7H3 > 30.25 pg/ml 60 *Log-rank P=0.0298 0.2 0.0 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 time (h) Percent survival VNR plasma levels [ng/ml] Day 28 Responders 11 2 Vinorelbine 30 mg p.o. three times a week in prostate cancer patients 140 28 % plasma B7H3 at day 0 Metronomic oral vinorelbine PK/PD ‐ II 40 20 0 0 Bocci et al. 2016 unpublished data 5 10 15 20 Time (months) After 4 weeks of treatment, non responder patients showed increased plasma concentrations of the soluble form of B7‐H3, an inhibitor of prostate cancer immunity Wang et al. Int J Cancer 2014, 134:2764 Metronomic UFT PK/PD 5‐FU 370 mg/m2 i.v. → Cmax 48.41±7.69 µg/ml Bocci et al. Clin Cancer Res 2000,6: 3032 daily dose of 100 mg UFT p.o in combination with CTX 50 mg < plasma VE‐cadherin in SD > plasmaTSP‐1 in SD TSP‐1 Allegrini, Di Desidero et al. Angiogenesis 2012,15:275 Antiangiogenic activity VE‐cadherin Pharmacokinetic parameters could be predictive of metronomic chemotherapy success ? Cut‐off = 0.501 µg/ml Sensitivity = 81.82% Specificity = 76.92% Cmax 5-FU (g/ml) 1.5 1.0 * 0.5 SD PD 0.0 day 1 of treatment PFS according to 5-FU Cmax at day 1 80 60 100 Cmax 5-FU > 0.501* Median PFS: 4.5 ms (95%C.I.1.5-7.5) Cmax 5-FU < 0,501* Median PFS: 2 ms (95%C.I. 0.1-3.9) *ROC curve Log-rank P=0.0222 40 20 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Percent survival Percent survival 100 OS according to 5-FU Cmax at day 1 Cmax 5-FU > 0.501* Median OS: 9.5 ms (95%C.I. 5-14) Cmax 5-FU < 0.501* Median OS: 5.65 ms (95%C.I. 3-8.3) 80 60 *ROC curve Log-rank P=0.0172 40 20 0 0 2 4 6 time (months) 8 10 12 14 16 18 20 22 time (months) Allegrini, Di Desidero et al. Angiogenesis 2012,15:275 5‐FU prodrugs pharmacokinetics: why we should go ahead… Despite the limitation of this analysis due to the small number of patients, these results identified a pharmacokinetic cut‐off value in a clinically relevant population UFT pharmacokinetic parameters may be used from the very first administration of the drug to predict the efficacy and the survival of colorectal patients undertaking the metronomic schedule. …and capecitabine ? Metronomic capecitabine Capecitabine 1250 mg/m2 p.o.→ Cmax 10.74±6.77 µg/ml Farkouh et al. Anticancer Res. 2014;34:3669 Yasuno et al. Oncol Rep. 2013;29:451 Which is the prevalent mechanism of action for these drug concentrations? Direct cytotoxic activity on tumor cells PK of 1 patient plasma levels (g/ml) 10 8 Cape 5DFCR 5DFUR 5FU 6 Antiangiogenic activity 4 2 0 0 1 2 3 4 5 time (h) dose of 800 mg capecitabine p.o Bocci et al. 2016 unpublished data Activation of antitumor innate immunity ? Pharmacokinetic interactions between topotecan and pazopanib in patients with pazopanib Significant differences of topotecan PK at standard doses Kerklaan et al. Br J Cancer 2015, 113:706 NO significant differences of topotecan PK at metronomic doses Turner et al. Anticancer Res 2013, 33:3823 Pharmacokinetic interactions between metronomic topotecan and pazopanib in preclinical studies Kumar et al. Clin Cancer Res 2011, 17:5656 NO significant differences of topotecan PK at metronomic doses Jedeszko et al. Sci Transl Med 2015, 282ra50 but… Increased intracellular accumulation of topotecan in cancer and endothelial cells Metronomic chemotherapy pharmacogenetics: the available pieces of the puzzle Is the genetic background involved in the efficacy or resistance to metronomic therapies? Are somatic mutations of tumors involved in the efficacy or resistance to metronomic therapies? Gene polymorphisms as possible predictive biomarkers for metronomic chemotherapy ? Prostate cancer patients harbouring the germline VEGF ‐634CC genotype were not responsive to metronomic cyclophosphamide Progression‐free survival CC CG/GG VEGF -634 CC: median PFS 2.2 ms (C.I. 95% 0.45-3.95) 100 P=0.0485 48.84% 20 39.53% 15 10 11.63% 5 % of survival number of patients 25 VEGF -634 CG/GG: median PFS 6.25 ms (C.I. 95% 3.28-8.62) 75 50 P=0.0042 25 0% 0 Responders Non Responders 0 0 5 10 15 20 25 30 time (months) Clinical response: decrease of PSA≥50% Median PFS 2.2 vs. 6.3 months Orlandi et al. Br J Cancer 2013,109:957 A possible hypothesis from this pilot study…. Orlandi et al. Br J Cancer 2013,109:957 Hypothesis Could be the beginning for a personalized metronomic chemotherapy? Urgent need for a prospective validation trial… but metronomic chemotherapy is given in combination with an antiangiogenic drug and after MTD chemotherapy… It will be the same? Conclusions 1) Different metronomic drug concentrations ‐ and schedules ‐ may determine different prevalent mechanisms of action (selection of therapy and patient based on the prevalent effect?) 2) Pharmacokinetic parameters should be extensively investigated in relation to pharmacodynamics (PK/PD approach) 3) Therapeutic drug monitoring (TDM) of metronomic chemotherapy to maintain drug concentrations in the “activity range” 4) Randomized, prospective, pharmacogenomic/pharmacogenetic clinical studies should be performed to achieve a personalized metronomic chemotherapy Acknowledgements My team Teresa Di Desidero Paola Orlandi (Anna Fioravanti) Romano Danesi University of Pisa Alfredo Falcone and collaborators Mario Giorgi and Alessandro Saba General Hospital of Pontedera Giacomo Allegrini and collaborators University of Toronto Robert S. Kerbel and collaborators Urban Emmenegger University of Texas at El Paso Giulio Francia Thanks to grants from: