Safety and pharmacokinetics of panitumumab in Japanese patients with advanced solid tumors.

Abstract:

BACKGROUND:Panitumumab is a fully human, monoclonal antibody against the epidermal growth factor receptor. Previous studies in non-Japanese patients with solid tumors showed that panitumumab exhibited nonlinear pharmacokinetics, was well tolerated (skin toxicities were the most common treatment-related adverse events), and had antitumor activity in some patients. This open-label, phase 1 study investigated panitumumab safety and pharmacokinetics in Japanese patients. METHODS:Japanese patients with advanced solid tumors were enrolled into one of three sequential panitumumab dose cohorts (cohort 1, 2.5 mg/kg weekly; cohort 2, 6.0 mg/kg every 2 weeks; and cohort 3, 9.0 mg/kg every 3 weeks) and received panitumumab until disease progression or drug intolerability. Safety endpoints included the incidence of adverse events, changes in laboratory values, and the appearance of anti-panitumumab antibodies. Serial pharmacokinetic samples were collected after the first and third doses of panitumumab. Tumors were assessed at week 8 and every 8 weeks thereafter. RESULTS:Eighteen patients (6 per cohort) were enrolled. No dose-limiting toxicities, investigator-reported infusion reactions, or deaths occurred. Seven patients had grade-3/4 adverse events; fatigue and anorexia were most common. The most common skin toxicities were rash and acneiform dermatitis. No neutralizing anti-panitumumab antibodies were detected. Panitumumab exhibited nonlinear pharmacokinetics, and antitumor activity was observed in 31% (4/13) of the patients with colorectal cancer. CONCLUSION:In Japanese patients with solid tumors, panitumumab was well tolerated, demonstrated pharmacokinetic and safety profiles similar to those observed previously in non-Japanese patients, and exhibited encouraging antitumor activity in patients with colorectal cancer.

journal_name

Int J Clin Oncol

authors

Doi T,Ohtsu A,Tahara M,Tamura T,Shirao K,Yamada Y,Otani S,Yang BB,Ohkura M,Ohtsu T

doi

10.1007/s10147-008-0855-2

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

307-14

issue

4

eissn

1341-9625

issn

1437-7772

journal_volume

14

pub_type

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