Trial Outcomes & Findings for A Targeted Phase I/II Trial of ZD6474 (Vandetanib; ZACTIMA) Plus the Proteasome Inhibitor, Bortezomib (Velcade ), in Adults With Solid Tumors With a Focus on Hereditary or Sporadic, Locally Advanced or Metastatic Medullary Thyroid Cancer (MTC) (NCT NCT00923247)

No participants were enrolled in the phase IIB cohort.

A Targeted Phase I/II Trial of ZD6474 (Vandetanib; ZACTIMA) Plus the Proteasome Inhibitor, Bortezomib (Velcade ), in Adults With Solid Tumors With a Focus on Hereditary or Sporadic, Locally Advanced or Metastatic Medullary Thyroid Cancer (MTC)

A maximum tolerated dose for vandetanib will be determined if dose limiting toxicity is observed in 2 or more patients at one of the dose levels being evaluated. The MTD will be the dose level immediately preceding the dose level at which DLT (e.g. defined as neutrophil count below 1000/ µL (grade 3) on 2 consecutive measurements drawn at least 72 hours OR a single neutrophil count below 500/µL occurred. Platelet count below 50,000 µL (grade 3) on 2 consecutive measurements drawn at least 72 hours apart OR a singe platelet count below 25,000/µL. A platelet transfusion administered when platelet count is below 50,000/µL is dose limiting thrombocytopenia, unless the transfusion is being administered for peri-operative coverage.

A maximum tolerated dose for bortezomib will be determined if dose limiting toxicity is observed in 2 or more patients at one of the dose levels being evaluated. The MTD will be the dose level immediately preceding the dose level at which DLT (e.g. defined as neutrophil count below 1000/ µL (grade 3) on 2 consecutive measurements drawn at least 72 hours OR a single neutrophil count below 500/µL occurred. Platelet count below 50,000 µL (grade 3) on 2 consecutive measurements drawn at least 72 hours apart OR a singe platelet count below 25,000/µL. A platelet transfusion administered when platelet count is below 50,000/µL is dose limiting thrombocytopenia, unless the transfusion is being administered for peri-operative coverage.

Response is assessed by the Response Evaluation Criteria in Solid Tumors (RECIST). Complete response is disappearance of all target lesions. Partial response is at least a 30% decrease in the sum of the longest diameter (LD) of target lesions, taking as reference the baseline sum LD. Progressive disease is at least a 20% increase in the sum of the LD of target lesions, taking as reference the smallest sum LD recorded since the treatment started or the appearance of one or more new lesions. Stable disease is neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for PD, taking as reference the smallest sum LD since the treatment started.

Progression free survival is defined as the duration of time from start of treatment to time of progression. Progression is assessed by the Response Evaluation Criteria in Solid Tumors (RECIST) and is defined as the appearance of one or more new lesions or unequivocal progression of existing non-target lesions. Although a clear progression of "non-target" lesions only is exceptional, the opinion of the treating physician should prevail in such circumstances, and the progression status should be confirmed at a later time by the review panel (or Principal Investigator).

Comparison of response between cohorts 1, 2A and 2B was to be determined by computed tomography scan reviews using the Response Evaluation Criteria in Solid Tumors (RECIST). Complete response is disappearance of all target lesions. Partial response is at least a 30% decrease in the sum of the longest diameter (LD) of target lesions, taking as reference the baseline sum LD.

Progression free survival is defined as the duration of time from start of treatment to time of progression. Comparison of PFS between cohorts 1, 2A and 2B was to be assessed by the Response Evaluation Criteria in Solid Tumors (RECIST). Progressive disease is at least a 20% increase in the sum of the LD of target lesions, taking as reference the smallest sum LD recorded since the treatment started or the appearance of one or more new lesions.

Here is the number of participants with adverse events assessed by the Common Terminology Criteria in Adverse Events (CTCAE) v4.0. For the detailed list of adverse events see the adverse event module.

Calcitonin was measured by the biomarker response criteria. Complete response (CR) is normalization (≤ upper limit of normal) of CTN level following treatment, confirmed with a repeat CTN level at least 4 weeks apart. Partial response (PR) is a ≥50% decrease in the CTN level relative to the baseline level, confirmed with a repeat CTN level at least 4 weeks apart. Progressive disease is a ≥50% increase in the CTN relative to the baseline level, confirmed with a repeat CTN level at least 4 weeks apart. Stable disease is \<50% increase or decrease in CTN level relative to the baseline level.

Carcinoembryonic Antigen (CEA) was measured by the biomarker response criteria. Complete response (CR) is normalization (≤ upper limit of normal) of CEA level following treatment, confirmed with a repeat CEA level at least 4 weeks apart. Partial response (PR) is a ≥50% decrease in the CEA level relative to the baseline level, confirmed with a repeat CEA level at least 4 weeks apart. Progressive disease is a ≥50% increase in the CEA relative to the baseline level, confirmed with a repeat CEA level at least 4 weeks apart. Stable disease is \<50% increase or decrease in CEA level relative to the baseline level.

Complete response is an average of 0-2 formed stools per day for a period of at least 4 weeks. partial response is a ≥50% decrease in the average stool frequency relative to baseline and a change in stool consistency from watery to loose (partially formed) for a period of at least 4 weeks. No response is criteria for CR or PR not met. Only patients with a stool frequency of ≥5/day and a stool consistency of watery will be evaluable for clinical response.

Baseline stool consistency (formed, loose or partially formed, watery) will be the consistency most frequently observed during a 7-day period immediately prior to starting vandetanib. Complete response (CR) is an average of 0-2 formed stools per day for a period of at least 4 weeks. Partial response (PR) is a ≥50% decrease in the average stool frequency relative to baseline and a change in stool consistency from watery to loose (partially formed) for a period of at least 4 weeks. No response is criteria for CR or PR not met. Only patients with a stool frequency of ≥5/day and a stool consistency of watery will be evaluable for clinical response.

Geometric mean for Bortezomib pharmacokinetic (PK) parameters both before (cycle 1 day 1) and during steady-state Vandetanib (cycle 3 day 1; exposures are dose normalized). Bortezomib plasma concentrations were measured using a validated LC-MS/MS assay with a lower limit of quantification (LLOQ) of 1 ng/mL. Only measured concentrations above the LLOQ were used in the calculation of PK parameters. The maximum plasma concentration (Cmax) was recorded as observed values.

The area under the concentration-time curve (AUC) extrapolated to infinity (AUCinf) was calculated using the linear up-log down trapezoidal method via extrapolation of AUC(LAST) (AUC to the last quantifiable time point) by dividing C(LAST) (the last measurable drug concentration, typically at 24 hour post-dose) by the rate constant of the terminal phase, lambda z. This constant was determined from the slope of the terminal phase of the concentration-time curve using weighted least-squares as the estimation procedure.

The time it takes for the measured concentration of the drug to drop by half.

Total systemic clearance = dose/area under curve extrapolated to infinity (AUCinf.). This measurement represents the rate at which plasma is systematically cleared of drug.

Vss represents the volume into which the drug distributes into once given to the patient at steady-state. This volume parameter provides a measure of where in the body the drug is going, based on fluid volume.

Because vandetanib PK exposure was only measured during a single 8-hr window during daily dosing, the only comparison to assess the effect of bortezomib is to compare these values to published literature."