Cancer Chemotherapy and Pharmacology

, Volume 73, Issue 4, pp 673–683

Phase 1 study of pazopanib alone or combined with lapatinib in Japanese patients with solid tumors

  • Megumi Inada-Inoue
  • Yuichi Ando
  • Kenji Kawada
  • Ayako Mitsuma
  • Masataka Sawaki
  • Taro Yokoyama
  • Yu Sunakawa
  • Hiroo Ishida
  • Kazuhiro Araki
  • Keishi Yamashita
  • Keiko Mizuno
  • Fumio Nagashima
  • Akiko Takekura
  • Kazuo Nagamatsu
  • Yasutsuna Sasaki
Original Article

DOI: 10.1007/s00280-014-2374-3

Cite this article as:
Inada-Inoue, M., Ando, Y., Kawada, K. et al. Cancer Chemother Pharmacol (2014) 73: 673. doi:10.1007/s00280-014-2374-3

Abstract

Purpose

A phase 1 study of pazopanib alone or in combination with lapatinib was conducted to assess the safety, tolerability, and pharmacokinetics of these oral tyrosine kinase inhibitors in Japanese patients with solid tumors.

Methods

In part A (monotherapy), 7 patients initially received pazopanib 800 mg/day, the recommended dose for non-Japanese patients. Then, 3 patients received pazopanib 400 mg/day on day 1 followed by 800 mg/day from day 2 onward. Three other patients received pazopanib 1,000 mg/day. In part B (combination therapy), 17 patients received pazopanib plus lapatinib (pazopanib/lapatinib) at once-daily doses of 400/1,000 mg (4 patients), 800/1,000 mg (3 patients), 400/1,500 mg (3 patients), and then 600/1,250 mg (7 patients).

Results

There was no dose-limiting toxicity during the study. In part A, most drug-related adverse events were grade 2 or lower, including neutropenia/neutrophil count decreased, thrombocytopenia/platelet count decreased, diarrhea, hypertension, aspartate aminotransferase increased, and lipase increased. In part B, rash, decreased appetite, and serum thyroid-stimulating hormone increased also occurred. In all dose groups, the plasma concentrations after multiple doses of pazopanib exceeded the target trough concentration for inhibition of vascular endothelial growth factor receptor-2 activity (20 μg/mL).

Conclusions

The pharmacokinetic profiles of pazopanib and lapatinib in Japanese patients were not apparently different from those reported in non-Japanese patients. There were no consistent trends in pharmacokinetic drug interactions between pazopanib and lapatinib. Pazopanib monotherapy at 800 and 1,000 mg once daily and pazopanib plus lapatinib once daily at any doses studied were well tolerated in Japanese patients.

Keywords

PazopanibLapatinibJapanese patientsPhase 1Pharmacokinetics

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Megumi Inada-Inoue
    • 1
  • Yuichi Ando
    • 1
  • Kenji Kawada
    • 1
  • Ayako Mitsuma
    • 1
  • Masataka Sawaki
    • 1
  • Taro Yokoyama
    • 2
  • Yu Sunakawa
    • 3
  • Hiroo Ishida
    • 4
  • Kazuhiro Araki
    • 5
  • Keishi Yamashita
    • 6
  • Keiko Mizuno
    • 7
  • Fumio Nagashima
    • 8
  • Akiko Takekura
    • 9
  • Kazuo Nagamatsu
    • 9
  • Yasutsuna Sasaki
    • 4
  1. 1.Department of Clinical Oncology and ChemotherapyNagoya University HospitalNagoyaJapan
  2. 2.Department of Palliative MedicineYokohama Municipal Citizen’s HospitalYokohama-shiJapan
  3. 3.Department of Internal MedicineShowa University Northern Yokohama HospitalYokohama-shiJapan
  4. 4.Department of MedicineShowa University HospitalTokyoJapan
  5. 5.Department of Breast OncologyThe Cancer Institute Hospital of JFCRTokyoJapan
  6. 6.Kawagoe Gastroenterical HospitalKawagoe-shiJapan
  7. 7.Department of Pulmonary Medicine, Graduate School of Medicine and Dental SciencesKagoshima UniversityKagoshima-shiJapan
  8. 8.Department of Internal Medicine, Medical OncologyKyorin University School of MedicineMitaka-shiJapan
  9. 9.GlaxoSmithKline K.K.TokyoJapan