Safety and Efficacy of CC-486 in Previously Treated Patients With Locally Advanced or Metastatic Nasopharyngeal Carcinoma

PFS was defined as the time from the date of start of the study treatment to the date of disease progression or death (any cause) on or prior to the data cut-off date for the statistical analysis, whichever occurred earlier, based on an independent radiology assessment of response using RECIST v1.1 criteria. Progressive disease was defined as at least a 20% increase in the sum of diameters of target or non-target lesions from nadir or appearance of a new lesion.

Time frame: From Day 1 of documented disease progression; up to data cut off date of 08 August 2017; median follow-up time for censored participants was 12.3 months

Population: The Efficacy Evaluable Population included all enrolled participants who met eligibility criteria and either received 2 cycles of CC-486 at any dose and discontinued treatment for progressive disease or received 4 cycles of CC-486 and had a baseline and at least 2 post-screening tumor assessments.

Overall response rate was defined as the combined incidence of Complete Response (CR) or Partial Response (PR), confirmed no less than 4 weeks after the criteria for response were first met, based on independent radiology assessment according to RECIST 1.1 criteria. Complete response was defined as the disappearance of all target lesions and non-target lesions; Partial response is at least a 30% decrease from baseline in the sum of diameters of target lesions with no progression of non-target lesions and no new lesions or disappearance of target lesions with persistence of one or more non-target lesions from baseline.

Time frame: Tumor response was assessed every (Q) 6 weeks for the first 3 evaluations then Q 9 weeks until disease progression as of the cut-off date of 08 August 2017; the median duration of treatment was 257 days for the 200 mg dose and 114.5 days for 300 mg dose

Population: The Efficacy Evaluable Population included all enrolled participants who met eligibility criteria and either received 2 cycles of CC-486 at any dose and discontinued treatment for progressive disease or received 4 cycles of CC-486 and had a baseline and at least 2 post-screening tumor assessments.

Apparent volume of distribution, calculated as \[(CL/F)/λz\].

Time frame: Blood samples for oral azacitidine PK assessment were collected prior to each dose (pre-dose) and over the 8-hour period following each dose (0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, and 8 hours post-dose or similar schedule).

Population: The PK population includes participants with evaluable CC-486 plasma PK profiles.

Apparent volume of distribution, calculated as \[(CL/F)/λz\].

Time frame: Blood samples for oral azacitidine PK assessment were collected prior to each dose (pre-dose) and over the 8-hour period following each dose (0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, and 8 hours post-dose or similar schedule).

Population: The PK population includes participants with evaluable CC-486 plasma PK profiles.

Area under the plasma concentration-time curve from Time 0 extrapolated to infinity, calculated as \[AUCt + Ct/ λz\]. Ct is the last quantifiable concentration. No AUC extrapolation was performed with unreliable λz. If AUC %Extrap was ≥25%, AUC inf was not reported.

Time frame: Blood samples for oral azacitidine PK assessment were collected prior to each dose (pre-dose) and over the 8-hour period following each dose (0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, and 8 hours post-dose or similar schedule).

Population: The PK population includes participants with evaluable CC-486 plasma PK profiles.

Area under the plasma concentration-time curve from Time 0 to the time of the last quantifiable concentration, calculated by linear trapezoidal method when concentrations are increasing and the logarithmic trapezoidal method when concentrations are decreasing.

Time frame: Blood samples for oral azacitidine PK assessment were collected prior to each dose (pre-dose) and over the 8-hour period following each dose (0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, and 8 hours post-dose or similar schedule).

Population: The PK population includes participants with evaluable CC-486 plasma PK profiles.

Overall survival was the time from the first dose of study drug to patient death from any cause. Participants who did not die were censored at the last known time the patient was alive date or the clinical data cutoff date, whichever was earlier.

Time frame: From Day 1 of study treatment to the first date of progressive disease or death; up to data cut-off date of 08 August 2017; overall median follow-up time for censored participants was 20.4 months

Population: The Efficacy Evaluable Population included all enrolled participants who met eligibility criteria and either received 2 cycles of CC-486 at any dose and discontinued treatment for progressive disease or received 4 cycles of CC-486 and had a baseline and at least 2 post-screening tumor assessments.

Maximum observed plasma concentration, obtained directly from the observed concentration versus time data.

Time frame: Blood samples for oral azacitidine PK assessment were collected prior to each dose (pre-dose) and over the 8-hour period following each dose (0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, and 8 hours post-dose or similar schedule).

Population: The PK population includes participants with evaluable CC-486 plasma PK profiles

Treatment-emergent adverse events (TEAEs) were defined as any adverse event (AE) or serious adverse event (SAE) that occurred or worsened on or after the day of the first dose of the investigational product (IP) through 28 days after the last dose of IP. In addition, any SAE with an onset date more than 28 day after the last dose of IP that was assessed by the investigator as related to IP was considered a TEAE. The severity of AEs was graded based on National Cancer Institute Common Terminology Criteria for Adverse Events (CTCAE), Version 4.0 and based on the following scale: Grade 1 = Mild Grade 2 = Moderate Grade 3 = Severe Grade 4 = Life threatening Grade 5 = Death.

Time frame: From date of first dose of study treatment to 28 days after last dose of study treatment; up to final data cut-off date of 08 August 2017; median treatment duration was 257 days for CC-486 200 mg and 114.5 days for CC-486 300 mg

Population: The Safety Population included all participants who received at least 1 dose of IP.

Disease Control Rate (DCR) was defined as the percentage of participants with a CR, PR, confirmed ≥ 4 weeks after the criteria for response were first met, or stable disease for ≥ 16 weeks from the first treatment, based on independent radiology assessment using RECIST 1.1 criteria. A complete response was defined as the disappearance of all target lesions and non-target lesions; a partial response is at least a 30% decrease from baseline in the sum of diameters of target lesions with no progression of non-target lesions and no new lesions or disappearance of target lesions with persistence of one or more non-target lesions from baseline. Stable disease is defined as neither sufficient shrinkage to qualify for PR nor sufficient increase of lesions to qualify for progressive disease

Time frame: Tumor response was assessed every 6 weeks for the first 3 evaluations then every 9 weeks until disease progression. As of the cut-off date of 08 August 2017 the median duration of treatment was 257 days for the 200 mg dose and 114.5 days for 300 mg dose

Population: Efficacy Evaluable Population = enrolled participants who met eligibility criteria and either received 2 cycles of IP at any dose and discontinued treatment for progressive disease or received 4 cycles of IP and had at least 2 post-screening tumor exams.

Terminal phase half-life in plasma, calculated as \[(ln 2)/λz\]. t1/2 was only calculated when a reliable estimate for λz could be obtained.

Time frame: Blood samples for oral azacitidine PK assessment were collected prior to each dose (pre-dose) and over the 8-hour period following each dose (0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, and 8 hours post-dose or similar schedule).

Population: The PK population includes participants with evaluable CC-486 plasma PK profiles.

Time to Cmax, obtained directly from the observed concentration versus time data.

Time frame: Blood samples for oral azacitidine PK assessment were collected prior to each dose (pre-dose) and over the 8-hour period following each dose (0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, and 8 hours post-dose or similar schedule).

Population: The PK population includes participants with evaluable CC-486 plasma PK profiles.