Phase 1 safety, tolerability, pharmacokinetics and pharmacodynamic results of KCL-286, a novel retinoic acid receptor-ß agonist for treatment of spinal cord injury, in male healthy participants.

AIMS: KCL-286 is an orally available agonist that activates the retinoic acid receptor (RAR) ß2, a transcription factor which stimulates axonal outgrowth. The investigational medicinal product is being developed for treatment of spinal cord injury (SCI). This adaptive dose escalation study evaluated the tolerability, safety and pharmacokinetics and pharmacodynamic activity of KCL-286 in male healthy volunteers to establish dosing to be used in the SCI patient population. METHODS: The design was a double blind, randomized, placebo-controlled dose escalation study in 2 parts: a single ascending dose adaptive design with a food interaction arm, and a multiple ascending dose design. RARß2 mRNA expression was evaluated in white blood cells. RESULTS: At the highest single and multiple ascending doses (100 mg), no trends or clinically important differences were noted in the incidence or intensity of adverse events (AEs), serious AEs or other safety assessments with none leading to withdrawal from the study. The AEs were dry skin, rash, skin exfoliation, raised liver enzymes and eye disorders. There was an increase in mean maximum observed concentration and area under the plasma concentration-time curve up to 24 h showing a trend to subproportionality with dose. RARß2 was upregulated by the investigational medicinal product in white blood cells. CONCLUSION: KCL-286 was well tolerated by healthy human participants following doses that exceeded potentially clinically relevant plasma exposures based on preclinical in vivo models. Target engagement shows the drug candidate activates its receptor. These findings support further development of KCL-286 as a novel oral treatment for SCI.

Serum amyloid A-A potential therapeutic target for hyper-inflammatory syndrome associated with COVID-19.

Serum amyloid-A (SAA) is associated with inflammatory disorders such as rheumatoid arthritis, Familial Mediterranean Fever, sarcoidosis, and vasculitis. There is accumulating evidence that SAA is a reliable biomarker for these autoinflammatory and rheumatic diseases and may contribute to their pathophysiology. Hyperinflammatory syndrome associated with COVID-19 is a complex interaction between infection and autoimmunity and elevation of SAA is strongly correlated with severity of the inflammation. In this review we highlight the involvement of SAA in these different inflammatory conditions, consider its potential role and discuss whether it could be a potential target for treatment of the hyperinflammatory state of COVID-19 with many potential advantages and fewer adverse effects. Additional studies linking SAA to the pathophysiology of COVID-19 hyper-inflammation and autoimmunity are needed to establish the causal relationship and the therapeutic potential of inhibitors of SAA activity.

Revitalising cancer trials post-pandemic: time for reform.

The COVID-19 pandemic posed significant risk to the health of cancer patients, compromised standard cancer care and interrupted clinical cancer trials, prompting dramatic streamlining of services. From this health crisis has emerged the opportunity to carry forward an unexpected legacy of positive reforms to clinical cancer research, where conventionally convoluted approvals processes, inefficient trial design, procedures and data gathering could benefit from the lessons in rationalisation learned during the pandemic.

A phase I/II study of epertinib plus trastuzumab with or without chemotherapy in patients with HER2-positive metastatic breast cancer.

BACKGROUND: Epertinib (S-222611) is a potent reversible inhibitor of HER2, EGFR and HER4. This trial evaluated the safety, tolerability, pharmacokinetics and antitumour activity of daily oral epertinib combined with trastuzumab (arm A), with trastuzumab plus vinorelbine (arm B) or with trastuzumab plus capecitabine (arm C), in patients with HER2-positive metastatic breast cancer (MBC). METHODS: Eligible patients, with or without brain metastases, had received prior HER2-directed therapy. A dose-escalation phase determined the tolerability of each combination and established a dose for further study. Further, patients were recruited to expansion cohorts in each of the 3 arms to further explore efficacy and safety. RESULTS: The recommended doses of epertinib were 600 mg, 200 mg and 400 mg in arms A, B and C, respectively. The most frequent grade 3/4 adverse event (AE) was diarrhoea in all arms, which was manageable with medical intervention and dose modification. The objective response rate (complete response [CR] plus partial response [PR]) in heavily pre-treated HER2-positive MBC patients at the recommended doses of epertinib combined with trastuzumab was 67% (N = 9), with trastuzumab plus vinorelbine was 0% (N = 5) and with trastuzumab plus capecitabine was 56% (N = 9). Notably, 4 of 6 patients previously treated with T-DM1 responded in the arm A expansion cohort (epertinib plus trastuzumab). In the arm C expansion cohort (epertinib plus trastuzumab plus capecitabine), 4 of 7 patients responded despite previous exposure to capecitabine. Measurable regression of brain metastases was observed in patients with CNS target lesions treated in both arms A and C. CONCLUSION: We observed safety, tolerability and encouraging antitumour activity of epertinib combined with trastuzumab, or with trastuzumab plus capecitabine. This supports further evaluation of these combinations in patients with pre-treated HER2-positive MBC, with or without brain metastases. TRIAL REGISTRATION: EudraCT Number: 2013-003894-87; registered 09-September-2013.

Pegvaliase for the treatment of phenylketonuria: A pivotal, double-blind randomized discontinuation Phase 3 clinical trial.

INTRODUCTION: Pegvaliase is a recombinant Anabaena variabilis phenylalanine ammonia lyase (PAL) enzyme under investigation for treatment of adult phenylketonuria (PKU). This manuscript describes results of a randomized discontinuation trial (RDT) designed to evaluate the effects of pegvaliase treatment on blood phenylalanine (Phe) and neuropsychiatric outcomes in adults with PKU. METHODS: PRISM-2 is a 4-part, Phase 3 study that enrolled adults with PKU receiving pegvaliase treatment (initiated in a prior Phase 2 or Phase 3 study). The RDT, Part 2 of PRISM-2, was an 8-week trial that evaluated change in blood Phe concentrations, neuropsychiatric and neurocognitive measures, and safety outcomes in PRISM-2 participants who had achieved at least a 20% blood Phe reduction from pre-treatment baseline with pegvaliase treatment. Participants were randomized 2:1 to either continue pegvaliase (20 mg/day or 40 mg/day) or switch to matching placebo. RESULTS: The pooled pegvaliase group enrolled 66 participants and each placebo group enrolled 14 participants. The primary endpoint of change in blood Phe concentration from RDT entry to RDT Week 8 was met with clinically meaningful and statistically significant differences between the pegvaliase and placebo groups. Mean (SD) blood Phe at the beginning of the RDT when all participants were receiving pegvaliase was 563.9 µM (504.6) in the group assigned to the 20 mg/day placebo group (n = 14), 508.2 µM (363.7) in those assigned to the 40 mg/day placebo group (n = 14), and 503.9 µM (520.3) in those assigned to continue pegvaliase treatment (n = 58). At Week 8 of the RDT, the least squares mean change (95% confidence interval) in blood Phe was 949.8 µM (760.4 to 1139.1) for the 20 mg/day placebo group and 664.8 µM (465.5 to 864.1) for the 40 mg/day placebo group in comparison to 26.5 µM (-68.3 to 121.3) for the pooled (20 mg/day and 40 mg/day) pegvaliase group (P < 0.0001 for pooled pegvaliase group vs each placebo group). Adverse events (AEs) were usually lower in the pooled placebo group when compared to the pooled pegvaliase group. The most common AEs for the pooled pegvaliase and pooled placebo groups were arthralgia (13.6% and 10.3%, respectively), headache (12.1% and 24.1%), anxiety (10.6% and 6.9%), fatigue (10.6% and 10.3%), and upper respiratory tract infection (1.5% and 17.2%). CONCLUSION: Mean blood Phe reduction was sustained in the pegvaliase group, while placebo groups had mean blood Phe concentration increase toward pre-treatment baseline levels. Results from this study confirmed the efficacy of pegvaliase in maintaining reduced blood Phe concentrations with a manageable safety profile for most participants.

Renal glucose excretion as a function of blood glucose concentration in subjects with type 2 diabetes--results of a hyperglycaemic glucose clamp study.

BACKGROUND: The purpose of this study was to investigate renal glucose excretion as a function of blood glucose concentration and to evaluate the within-subject variability and between-subject variability in subjects with type 2 diabetes. METHODS: Twenty-two subjects with type 2 diabetes [age 58 (12) years, diabetes duration 7 (6) years, endogenous creatinine clearance 117 (38) ml min(-1) 1.73 m(-2); median (inter-quartile range, IQR)] underwent two five-period hyperglycaemic glucose clamp experiments at intervals of 7-21 days. Starting from an initial blood glucose level of 12.2 mmol l(-1), subsequent glucose clamp levels were chosen using an algorithm based on urinary glucose concentrations measured at the end of the preceding glucose clamp period. That is, blood glucose was either stepwise decreased or increased depending on whether urinary glucose concentration was above or below 11.1 mmol l(-1), respectively. RESULTS: As expected, increasing the blood glucose from 7.8 to 13.3 mmol l(-1) during the glucose clamps resulted in a steep increase of urinary glucose excretion from 0.06 to 0.77 mmol min(-1). With decreasing blood glucose, a measurable glucosuria persisted up to a blood glucose level of 7.8 mmol l(-1). When defining the (pseudo)threshold for renal glucose excretion (PRT(G)) as the highest blood glucose level during glucose clamps associated with a concomitant glucose concentration in urine of <2.8 mmol l(-1), median (IQR) PRT(G) was 11.0 (1.1) mmol l(-1). The within-subject variability of PRT(G), i.e. the difference between two assessments, was low, 0.1 (0.0) mmol l(-1) while the between-subject variability of PRT(G) was high, ranging from 7.7 to 12.2 mmol l(-1). CONCLUSION: Renal glucose excretion increases in a proportional manner with increasing blood glucose. When decreasing blood glucose to euglycaemic blood glucose levels, glucosuria persists so that the classical concept of a renal threshold for glucose excretion cannot be upheld in subjects with type 2 diabetes.

Effects of an opiate on cold-induced pain and the CNS in healthy volunteers.

The analgesic activity of an opiate was studied in 12 healthy volunteers using a cold-induced pain (CP) model. Effects on the central nervous system (CNS) were also measured. According to a double-blind, randomised, balanced, cross-over design with an interval of 7 days between occasions, subjects received single oral doses of 2, 4 and 8 mg dipipanone (D2, D4, D8) and a placebo. The CP test and a battery of measurements of CNS function were performed 3 times on each study day, once before and again 1.5 h and 3.0 h after treatment. Mean pain cores on a computerised visual analogue scale were significantly higher after placebo than those after 4 mg (P less than 0.05) and 8 mg (P less than 0.01) dipipanone and a dose-response relationship was evident. The opiate did not affect baseline blood pressure before the CP test but the hypertensive response to the painful cold stimulus was diminished 3 h after D8. Scores on scales for subjective assessment of alertness were significantly reduced 3 h after the 8 mg dose and pupil diameters were significantly smaller after all 3 doses of dipipanone. Body sway and visual near points were not significantly altered by the opiate. It is concluded that the CP test is a sensitive model for measurement of opiate-induced analgesia in healthy volunteers. Pupillometry and visual analogue scales are useful for the assessment of central effects of opiates.