Participants received chemotherapy (gemcitabine) with a starting dose of 1000 milligrams per meter squared (mg/m^2) intravenously (IV) on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 milligrams per kilogram (mg/kg) (0.1 mg/kg cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.1 mg/kg cohort experienced a dose limiting toxicity in Cycle 1, subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.2 mg/kg cohort (escalation cohort) experienced a dose limiting toxicity in Cycle 1, 0.2 mg/kg was considered the maximum tolerated dose (MTD). Additional participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 mg/kg (0.1 mg/kg cohort) for up to a maximum of 12 cycles. Subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received chemotherapy on Day 1, 8, and 15 or every 28 day cycle and CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles. Additional participants were enrolled in the 0.2 mg/kg dose cohort and received chemotherapy on Day 1, 8, and 15 or every 28 day cycle and CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 mg/kg (0.1 mg/kg cohort) for up to a maximum of 12 cycles. Subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received chemotherapy on Day 1, 8, and 15 or every 28 day cycle and CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles. Additional participants were enrolled in the 0.2 mg/kg dose cohort and received chemotherapy on Day 1, 8, and 15 or every 28 day cycle and CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 mg/kg (0.1 mg/kg cohort) for up to a maximum of 12 cycles. Subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received chemotherapy on Day 1, 8, and 15 or every 28 day cycle and CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles. Additional participants were enrolled in the 0.2 mg/kg dose cohort and received chemotherapy on Day 1, 8, and 15 or every 28 day cycle and CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 milligrams per meter squared (mg/m^2) intravenously (IV) on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 milligrams per kilogram (mg/kg) (0.1 mg/kg cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.1 mg/kg cohort experienced a dose limiting toxicity in Cycle 1, subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.2 mg/kg cohort (escalation cohort) experienced a dose limiting toxicity in Cycle 1, 0.2 mg/kg was considered the maximum tolerated dose (MTD). Additional participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 milligrams per meter squared (mg/m^2) intravenously (IV) on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 milligrams per kilogram (mg/kg) (0.1 mg/kg cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.1 mg/kg cohort experienced a dose limiting toxicity in Cycle 1, subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.2 mg/kg cohort (escalation cohort) experienced a dose limiting toxicity in Cycle 1, 0.2 mg/kg was considered the maximum tolerated dose (MTD). Additional participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 milligrams per meter squared (mg/m^2) intravenously (IV) on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 milligrams per kilogram (mg/kg) (0.1 mg/kg cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.1 mg/kg cohort experienced a dose limiting toxicity in Cycle 1, subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.2 mg/kg cohort (escalation cohort) experienced a dose limiting toxicity in Cycle 1, 0.2 mg/kg was considered the maximum tolerated dose (MTD). Additional participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 milligrams per meter squared (mg/m^2) intravenously (IV) on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 milligrams per kilogram (mg/kg) (0.1 mg/kg cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.1 mg/kg cohort experienced a dose limiting toxicity in Cycle 1, subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.2 mg/kg cohort (escalation cohort) experienced a dose limiting toxicity in Cycle 1, 0.2 mg/kg was considered the maximum tolerated dose (MTD). Additional participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 milligrams per meter squared (mg/m^2) intravenously (IV) on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 milligrams per kilogram (mg/kg) (0.1 mg/kg cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.1 mg/kg cohort experienced a dose limiting toxicity in Cycle 1, subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.2 mg/kg cohort (escalation cohort) experienced a dose limiting toxicity in Cycle 1, 0.2 mg/kg was considered the maximum tolerated dose (MTD). Additional participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 milligrams per meter squared (mg/m^2) intravenously (IV) on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 milligrams per kilogram (mg/kg) (0.1 mg/kg cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.1 mg/kg cohort experienced a dose limiting toxicity in Cycle 1, subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.2 mg/kg cohort (escalation cohort) experienced a dose limiting toxicity in Cycle 1, 0.2 mg/kg was considered the maximum tolerated dose (MTD). Additional participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.2 mg/kg cohort (escalation cohort) experienced a dose limiting toxicity in Cycle 1, 0.2 mg/kg was considered the maximum tolerated dose (MTD). Additional participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 milligrams per meter squared (mg/m^2) intravenously (IV) on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 milligrams per kilogram (mg/kg) (0.1 mg/kg cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.1 mg/kg cohort experienced a dose limiting toxicity in Cycle 1, subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 mg/m^2 IV on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. If 0 out of 3 or <2 out of 6 participants in the CP-870893 0.2 mg/kg cohort (escalation cohort) experienced a dose limiting toxicity in Cycle 1, 0.2 mg/kg was considered the maximum tolerated dose (MTD). Additional participants were enrolled in the 0.2 mg/kg dose cohort and received CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.

Participants received chemotherapy (gemcitabine) with a starting dose of 1000 milligrams per meter squared (mg/m^2) intravenously (IV) on Day 1, 8, and 15 of every 28 day cycle up to a maximum of 12 cycles. CP-870893 administered IV on Day 3 of every 28 day cycle with starting dose of 0.1 milligrams per kilogram (mg/kg) (0.1 mg/kg cohort) for up to a maximum of 12 cycles.

Subsequent participants were enrolled in the 0.2 mg/kg dose cohort and received chemotherapy on Day 1, 8, and 15 or every 28 day cycle and CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg escalation cohort) for up to a maximum of 12 cycles.

Additional participants were enrolled in the 0.2 mg/kg dose cohort and received chemotherapy on Day 1, 8, and 15 or every 28 day cycle and CP-870893 0.2 mg/kg IV on Day 3 of every 28 day cycle (0.2 mg/kg MTD expansion cohort) for up to a maximum of 12 cycles.