Phase I pharmacokinetic study of the safety and tolerability of lapatinib (GW572016) in combination with oxaliplatin/fluorouracil/leucovorin (FOLFOX4) in patients with solid tumors.
OBJECTIVE
This phase I study was designed to determine the optimally tolerated regimen (OTR), safety, and clinical activity of lapatinib in combination with FOLFOX4 [oxaliplatin/leucovorin/5-fluorouracil (5-FU)] in patients with solid tumors. Furthermore, the pharmacokinetics of lapatinib, oxaliplatin, and 5-FU when given alone and in combination were evaluated.


METHODS
This study was conducted in two parts. Part 1 was designed to determine the OTR and part 2 was the pharmacokinetic part of the study. Lapatinib was administered once daily for the entire duration of the study. Leucovorin and oxaliplatin were given concurrently over 2 h as an i.v. infusion, after which 5-FU was given as a bolus followed by continuous infusion over 22 h on day 1. 5-FU and leucovorin administration were repeated in an identical manner on day 2. Cycles were repeated every 2 weeks. Once the OTR was determined, it was to become the dose level for patients included in the pharmacokinetic part of the study.


RESULTS
A total of 34 patients was treated in this study. No dose-limiting toxicities were observed and the OTR was established at 1,500 mg/d lapatinib in combination with the standard FOLFOX4 regimen. Nonhematologic toxicities consisted mainly of nausea, diarrhea, vomiting, fatigue, neuropathy, and mucositis. The most important hematologic toxicity was neutropenia. No drug-drug interactions between lapatinib and the FOLFOX4 regimen were observed.


CONCLUSIONS
Lapatinib can be safely administered in combination with the standard FOLFOX4 regimen. Further studies are warranted to explore the potential additive antitumor effect of lapatinib in combination with the FOLFOX4 regimen.
Siegel-Lakhai
Wandena S
WS
The Netherlands Cancer Institute/Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands. wan.les@quicknet.nl
Beijnen
Jos H
JH
Vervenne
Walter L
WL
Boot
Henk
H
Keessen
Marianne
M
Versola
Melissa
M
Koch
Kevin M
KM
Smith
Deborah A
DA
Pandite
Lini
L
Richel
Dirk J
DJ
Schellens
Jan H M
JH
D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000009:adverse effects / Q000493:pharmacokinetics*; D004305:Dose-Response Relationship, Drug; D005260:Female; D005472:Fluorouracil / Q000009:adverse effects / Q000493:pharmacokinetics; D006801:Humans; D000077341:Lapatinib; D002955:Leucovorin / Q000009:adverse effects / Q000493:pharmacokinetics; D008297:Male; D020714:Maximum Tolerated Dose; D008875:Middle Aged; D009369:Neoplasms / Q000097:blood / Q000188:drug therapy*; D009944:Organoplatinum Compounds / Q000009:adverse effects / Q000493:pharmacokinetics; D011799:Quinazolines / Q000009:adverse effects / Q000493:pharmacokinetics*
D009944:Organoplatinum Compounds; D011799:Quinazolines; D000077341:Lapatinib; D002955:Leucovorin; D005472:Fluorouracil