A Phase Ib, Open-label, Multicenter Study of the Safety and PK of the Combination of rhuMAb2c4 (Omnitarg), a Recombinant Humanized Antibody to HER2, and Capecitabine (Xeloda) in Patients With Advanced Solid Tumors

MTD was defined as the highest tolerated dose combination of capecitabine (825 mg, 1000 mg or 1250 mg) and pertuzumab, without causing Dose Limiting Toxicities (DLTs). DLTs were defined as follows: 1) Any non-hematological toxicity greater than or equal to (≥) Grade 3 according to Common Terminology Criteria for Adverse Events (CTCAE) version 3.0 except for fever, chills and flu-like symptoms, in spite of adequate toxicity management; 2) Grade 4 neutropenia lasting > 7 days; 3) Febrile neutropenia; 4) Thrombocytopenia Grade 4 or any thrombocytopenia requiring platelet transfusion; 5) Any subjectively intolerable toxicity felt by the investigator to be related to either one of the compounds. Participants who withdrew from the study without completing the first treatment cycle for reasons other than DLT were not considered evaluable for DLT. MTD was measured in mg/m^2.

DLTs were defined as follows: 1)Any non-hematological toxicity greater than or equal to (≥) Grade 3 according to Common Terminology Criteria for Adverse Events (CTCAE) version 3.0 except for fever, chills and flu-like symptoms, in spite of adequate toxicity management; 2) Grade 4 neutropenia lasting > 7 days; 3) Febrile neutropenia; 4) Thrombocytopenia Grade 4 or any thrombocytopenia requiring platelet transfusion; 5) Any subjectively intolerable toxicity felt by the investigator to be related to either one of the compounds. Participants who withdrew from the study without completing the first treatment cycle for reasons other than DLT were not considered evaluable for DLT.

The biological half-life or terminal half-life of pertuzumab is the time in days it takes for it to lose half of its pharmacologic activity. t1/2 was measured in days.

Cmax refers to the maximum (or peak) serum concentration that a drug achieves in a specified compartment or test area of the body after the drug has been administrated and prior to the administration of a second dose and was measured as nanograms per milliliter (ng/mL).

Tmax is defined as the time after administration of a drug when the maximum plasma concentration is reached; when the rate of absorption equals the rate of elimination. Tmax was measured in days.

The area under the plot of plasma concentration of drug against time after drug administration is defined as the area under the curve (AUC). The AUC0-last is calculated from time 0 (prior to administration of medication) to last measured data point. The AUC is of particular use in estimating the bioavailability of drugs, by measuring the extent of absorption. AUC was measured as ng*day/mL.

The AUC0-infinity is calculated from time 0 (prior to administration of medication) to infinity (the time of complete elimination of the drug). The AUC is of particular use in estimating the bioavailability of drugs, by measuring the extent of absorption. AUC is measured as nanograms times days per milliliter (ng*day/mL).

The volume of distribution at steady state (Vss), also known as apparent volume of distribution, is a pharmacological, theoretical volume that the total amount of administered drug would have to occupy (if it were uniformly distributed), to provide the same concentration as it currently is in blood plasma. Vss was measured in mL

Clearance (expressed as volume/time) describes the removal of drug from a volume of plasma in a given unit of time (drug loss from the body). It is measured as milliliters per day (mL/day).

Capecitabine is a novel oral fluoropyrimidine carbamate that is preferentially converted to the cytotoxic moiety fluorouracil (5-fluorouracil; 5-FU) in target tumour tissue through a series of 3 metabolic steps through the intermediate metabolites 5'-deoxy-5-fluorocytidine (5'-DFCR), 5'-deoxy-5-fluorouridine (5'-DFUR), and α-fluoro-β-alanine (FBAL). The biological half-life or terminal half-life is the time in days it takes for it to lose half of its pharmacologic activity.

Capecitabine is an oral fluoropyrimidine carbamate that is preferentially converted to the cytotoxic moiety 5-FU in target tumour tissue through a series of 3 metabolic steps through the intermediate metabolites 5'-DFCR, 5'-DFUR, and FBAL. Cmax refers to the maximum (or peak) serum concentration that a drug achieves in a specified compartment or test area of the body after the drug has been administrated and prior to the administration of a second dose and is measures as nanograms per milliliter (ng/mL).

Capecitabine is a novel oral fluoropyrimidine carbamate that is preferentially converted to the cytotoxic moiety fluorouracil (5-fluorouracil; 5-FU) in target tumour tissue through a series of 3 metabolic steps through the intermediate metabolites 5'-deoxy-5-fluorocytidine (5'-DFCR), 5'-deoxy-5-fluorouridine (5'-DFUR), and α-fluoro-β-alanine (FBAL). Tmax is defined as the time after administration of a drug when the maximum plasma concentration is reached; when the rate of absorption equals the rate of elimination.