Safety and Tolerability Study Of PF-06835375 In Subjects With Seropositive Systemic Lupus Erythematosus Or Rheumatoid Arthritis

DLT was defined as any of the following events meeting the criteria: (1) >=2 participants within a dose cohort developed Common Terminology Criteria for Adverse Events (CTCAE) v4.0 Grade 3 adverse event considered to be serious in the same organ system or 1 participant developed a CTCAE v4.0 Grade 4 or higher SAE considered related to study drug; (2) 50% or more participants within a dose cohort experienced a CTCAE v4.0 Grade 3 or higher infusion reaction; (3) a confirmed or probable case of Progressive Multifocal Leukoencephalopathy was observed; (4) the mean exposure for the treatment group reached or exceeded the exposure stopping limit of Cav of 261 mg/mL, or, based on the observed data, the group mean Cav of the next planned dose was projected to exceed the exposure stopping limit. Cav = average serum concentration.

An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. Treatment-related AE was any untoward medical occurrence attributed to study drug in a participant who received study drug. Relatedness to study drug was assessed by the investigator. Treatment-emergent were events between first dose of study drug and up to approximately Week 40 that were absent before treatment or that worsened relative to pretreatment state. AEs are classified according to the severity in 3 categories a) mild - AEs does not interfere with participant's usual function b) moderate - AEs interferes to some extent with participant's usual function c) severe - AEs interferes significantly with participant's usual function.

An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. Treatment-related AE was any untoward medical occurrence attributed to study drug in a participant who received study drug. Relatedness to study drug was assessed by the investigator. A serious adverse event (SAE) was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. Treatment-emergent were events between first dose of study drug and up to approximately Week 40 that were absent before treatment or that worsened relative to pretreatment state.

An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. Treatment-emergent were events between first dose of study drug and up to approximately Week 40 that were absent before treatment or that worsened relative to pretreatment state.

Hematology included hemoglobin, hematocrit, red blood cell, mean corpuscular volume, mean corpuscular hemoglobin, mean corpuscular hemoglobin concentration, platelet and white blood cell count, total neutrophils, eosinophils, monocytes, basophils and lymphocytes. Chemistry included blood urea nitrogen, creatinine, glucose, calcium, sodium, potassium, chloride, bicarbonate, aspartate aminotransferase, alanine aminotransferase, total bilirubin, alkaline phosphatase, uric acid, albumin, total protein and creatine kinase. Urinalysis included pH, glucose, protein, blood, ketones, nitrites, leukocyte esterase, urobilinogen, urine bilirubin, microscopy and creatinine. Clinical significance was judged by the investigator and those met the criteria of AE are listed here. Clinically significant laboratory abnormalities reported for at least 1 participant in the whole study are presented here. Baseline was the last pre-dose measurement (first treatment for MAD cohorts).

Criteria for abnormality in vital signs: supine pulse rate <40 beats per minute (bpm) or >120 bpm; standing pulse rate <40 bpm or >120 bpm; sitting systolic blood pressure (BP) <90 mmHg, maximum increase or decrease from baseline of >=30 mmHg; sitting diastolic BP <50 mmHg, maximum increase or decrease from baseline of >=20 mmHg. Baseline was defined as the last pre-dose measurement in Day 1. Only those categories in which at least 1 participant had data were reported.

ECG abnormalities criteria included: 1) maximum QTc interval (ms): 450<= QTc <480, 480<= QTc <500, and QTc >=500; QTc maximum increase from baseline (ms): 30<= change <60, and change >=60; 2) maximum PR interval (ms): >=300; PR increase from baseline (ms): baseline >200 with 25% increase at maximum, baseline <=200 with 50% increase at maximum; 3) maximum QRS (ms): >=140; QRS increase from baseline (ms) >=50%. QTcF indicates QT interval corrected using the Fridericia's formula. QTcB indicates QT interval corrected using the Bazett's formula. Baseline was defined as the average of the triplicate pre-dose recordings at Day 1. Only those categories in which at least 1 participant had data were reported.

An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. Treatment-related AE was any untoward medical occurrence attributed to study drug in a participant who received study drug. Relatedness to study drug was assessed by the investigator. The incidence of AEs by system organ class "infections and infestations" was reported here.

Blood samples for the assessment of B cell were collected and analyzed by flow cytometry. Baseline was defined as the average of screening and pre-dose measures.

Blood samples for the assessment of circulating follicular T helper like (cTfh) cell were collected and analyzed by flow cytometry. Baseline was defined as the average of screening and pre-dose measures.

Cmax is maximum observed serum concentration. Cmax for PF-06835375 was observed directly from data.

Tmax is the time for Cmax. Tmax for PF-06835375 was observed directly from data as time of first occurrence.

AUCinf is the area under the serum concentration-time profile from time zero extrapolated to infinite time.

AUClast is the area under the curve from time zero to last quantifiable concentration. AUClast for PF-06835375 was determined using linear/log trapezoidal method.

Cmax is maximum observed serum concentration. Cmax for PF-06835375 was observed directly from data. There were less than 3 quantifiable concentrations for participants in PF-06835375 0.3 mg SC MAD cohort, therefore the serum PK parameters were not calculated.

Tmax is the time for Cmax. Tmax for PF-06835375 was observed directly from data as time of first occurrence. There were less than 3 quantifiable concentrations for participants in PF-06835375 0.3 mg SC MAD cohort, therefore the serum PK parameters were not calculated.

AUCtau is area under the serum concentration-time profile from time 0 to time tau, the dosing interval, where tau= 28 days. AUCtau for PF-06835375 was determined using linear/log trapezoidal method. There were less than 3 quantifiable concentrations for participants in PF-06835375 0.3 mg SC MAD cohort, therefore the serum PK parameters were not calculated.

AUClast is the area under the curve from time zero to last quantifiable concentration. AUClast for PF-06835375 was determined using linear/log trapezoidal method. There were less than 3 quantifiable concentrations for participants in PF-06835375 0.3 mg SC MAD cohort, therefore the serum PK parameters were not calculated.

Cmin is minimum observed serum trough concentration. Cmin was observed directly from data. There were less than 3 quantifiable concentrations for participants in PF-06835375 0.3 mg SC MAD cohort, therefore the serum PK parameters were not calculated.

Rac is observed accumulation ratio. Rac = Day 29 AUCtau / Day 1 AUCtau. There were less than 3 quantifiable concentrations for participants in PF-06835375 0.3 mg SC MAD cohort, therefore the serum PK parameters were not calculated.

PTF is peak-to-trough fluctuation at steady state. PTF = (Cmax-Cmin)/Cav. Cav is average serum concentration. There were less than 3 quantifiable concentrations for participants in PF-06835375 0.3 mg SC MAD cohort, therefore the serum PK parameters were not calculated.

To evaluate the immunogenicity as measured by presence of ADA and NAb in participants treated with PF-06835375.