Effects of canagliflozin are mostly observed at first follow-up, within 6 months of commencement: results for the ABCD canagliflozin audit

Introduction: Canagliflozin was initially approved for use in the UK in March 2013. Randomised control trial evidence has demonstrated multiple beneficial effects. Many of these are present at initial follow-up and within 26 weeks of randomised control trial data. Our aim was to assess whether the beneficial effects of canagliflozin on multiple clinical and biochemical parameters occurred prior to first follow-up and, if so, whether these continued to improve or simply persisted at second follow-up.Methods: Data were extracted from the ABCD nationwide canagliflozin audit to include a minimum dataset of a baseline value and one (or two) follow-ups for each value.Results: A total of 1,214 patient datasets were identified and used in the analysis: mean±SD age 60.1±10.6 years; median duration of diabetes 8 (IQR 2.4–12.6 years); baseline HbA1c 75.1±17.4 mmol/mol (9.0±1.59%) and weight 97.8±22.0 kg. 68.3% of the patients were Caucasian where this was known (n=183). At first follow-up (median 0.7 years) from baseline: change in HbA1c −9.3 mmol/mol (95% CI −8.2 to −10.4; p<0.0001), weight −2.3 kg (95% CI −1.9 to −2.5; p<0.0001); BMI −0.7 kg/m2 (95% CI −0.6 to −0.8; p<0.0001); alanine aminotransferase −2 U/L (95% CI −1.3 to −2.7; p<0.0001); eGFR −0.9 mL/min/1.73 m2 (95% CI −0.4 to −1.4; p<0.001); systolic blood pressure (BP) −2.6 mmHg (95% CI −1.6 to −3.5; p<0.0001) and diastolic BP −0.9 mmHg (95% CI −0.2 to −1.6; p<0.001). Significant differences persisted comparing second follow-up (median 1.2 years) to baseline, but no further significant changes were noted between first follow-up and second follow-up other than in weight and BMI with further change in weight −0.65 kg (95% CI −0.2 to −1.1; p=0.047).Conclusion: The improvements following canagliflozin in this real-world cohort seem to occur within the first 0.7 years of treatment, which is similar to randomised controlled trial data. These improvements seem to be maintained over the next 6 months, with significant further weight loss occurring between 0.7 years and 1.2 years, although the mechanism of this is unclear and might be due to confounders. More evidence on this point is needed.

Reductions in alanine aminotransferase levels with liraglutide treatment are greatest in those with raised baseline levels and are independent of weight loss: real-world outcome data from the ABCD Nationwide Liraglutide Audit

People with type 2 diabetes mellitus experience an increased prevalence of non-alcoholic fatty liver disease (NAFLD) compared with the general population and often with worse outcomes. As part of the ABCD Liraglutide Nationwide Audit Programme, we obtained and analysed data from 2009 to 2018 to assess the impact of liraglutide on alanine aminotransferase (ALT) levels as a marker of liver inflammation (often used in clinical trials as a marker of NAFLD). After excluding those with insufficient or incomplete data, we analysed the results from 1,759 patients treated in the real-world clinical setting. Our results demonstrated an overall significant decrease in median ALT (−1 U/L, 95% CI −1 to −2, p<0.001) compared with baseline, which was more pronounced in patients with elevated ALT based on gender- specific ranges (male: −4 U/L, 95% CI −3 to −6, p<0.001; female: −3 U/L, 95% CI −2 to −4, p<0.001). There was no correlation between weight loss and degree of ALT change (rho=−0.0002, p=0.41). Our data mirror outcomes from large randomised controlled trials and show that the impact of liraglutide on ALT is likely generalisable to real-world practice. Some of our data suggest that there may be a slight increase in ALT in those with normal levels at baseline, although the clinical significance of this is uncertain.

Efficacy and Safety of Dapagliflozin in Patients With Inadequately Controlled Type 1 Diabetes: The DEPICT-1 52-Week Study

OBJECTIVE

This study evaluated the long-term safety and efficacy of dapagliflozin as an adjunct to adjustable insulin in patients with type 1 diabetes and inadequate glycemic control.

RESEARCH DESIGN AND METHODS

DEPICT-1 (Dapagliflozin Evaluation in Patients With Inadequately Controlled Type 1 Diabetes) was a randomized (1:1:1), double-blind, placebo-controlled phase 3 study of dapagliflozin 5 mg and 10 mg in patients with type 1 diabetes (HbA_1c 7.5-10.5% [58-91 mmol/mol]) (NCT02268214). The results of the 52-week study, consisting of the 24-week short-term and 28-week extension period, are reported here.

RESULTS

Of the 833 patients randomized into the study, 708 (85%) completed the 52-week study. Over 52 weeks, dapagliflozin 5 mg and 10 mg led to clinically significant reductions in HbA_1c (difference vs. placebo [95% CI] -0.33% [-0.49, -0.17] [-3.6 mmol/mol (-5.4, -1.9)] and -0.36% [-0.53, -0.20] [-3.9 mmol/mol (-5.8, -2.2)], respectively) and body weight (difference vs. placebo [95% CI] -2.95% [-3.83, -2.06] and -4.54% [-5.40, -3.66], respectively). Serious adverse events were reported in 13.4%, 13.5%, and 11.5% of patients in the dapagliflozin 5 mg, 10 mg, and placebo groups, respectively. Although hypoglycemia events were comparable across treatment groups, more patients in the dapagliflozin groups had events adjudicated as definite diabetic ketoacidosis (DKA; 4.0%, 3.4%, and 1.9% in dapagliflozin 5 mg, 10 mg, and placebo groups, respectively).

CONCLUSIONS

Over 52 weeks, dapagliflozin led to improvements in glycemic control and weight loss in patients with type 1 diabetes, while increasing the risk of DKA.

Adaptor protein-2 sigma subunit mutations causing familial hypocalciuric hypercalcaemia type 3 (FHH3) demonstrate genotype-phenotype correlations, codon bias and dominant-negative effects

The adaptor protein-2 sigma subunit (AP2σ2) is pivotal for clathrin-mediated endocytosis of plasma membrane constituents such as the calcium-sensing receptor (CaSR). Mutations of the AP2σ2 Arg15 residue result in familial hypocalciuric hypercalcaemia type 3 (FHH3), a disorder of extracellular calcium (Ca²⁺_o) homeostasis. To elucidate the role of AP2σ2 in Ca²⁺_o regulation, we investigated 65 FHH probands, without other FHH-associated mutations, for AP2σ2 mutations, characterized their functional consequences and investigated the genetic mechanisms leading to FHH3. AP2σ2 mutations were identified in 17 probands, comprising 5 Arg15Cys, 4 Arg15His and 8 Arg15Leu mutations. A genotype–phenotype correlation was observed with the Arg15Leu mutation leading to marked hypercalcaemia. FHH3 probands harboured additional phenotypes such as cognitive dysfunction. All three FHH3-causing AP2σ2 mutations impaired CaSR signal transduction in a dominant-negative manner. Mutational bias was observed at the AP2σ2 Arg15 residue as other predicted missense substitutions (Arg15Gly, Arg15Pro and Arg15Ser), which also caused CaSR loss-of-function, were not detected in FHH probands, and these mutations were found to reduce the numbers of CaSR-expressing cells. FHH3 probands had significantly greater serum calcium (sCa) and magnesium (sMg) concentrations with reduced urinary calcium to creatinine clearance ratios (CCCR) in comparison with FHH1 probands with CaSR mutations, and a calculated index of sCa × sMg/100 × CCCR, which was ≥ 5.0, had a diagnostic sensitivity and specificity of 83 and 86%, respectively, for FHH3. Thus, our studies demonstrate AP2σ2 mutations to result in a more severe FHH phenotype with genotype–phenotype correlations, and a dominant-negative mechanism of action with mutational bias at the Arg15 residue.

A case of severe staphylococcal septicaemia: septic arthritis and a mediastinal abscess following leflunamide therapy for rheumatoid arthritis

This highly unusual case illustrates how a potentially life-threatening complication may develop insidiously in the context of immunosuppression. A 46-year-old woman presented with increasing malaise and a marked inflammatory response in the context of immunosuppressive therapy for rhueumatoid arthritis. On the basis of microbiological findings, the patient was treated for systemic staphylococcal infection with a prolonged antibiotic course. In addition, incision and drainage procedures were performed on associated, non-resolving abscesses at various sites. One particular lesion in the breast was slow to heal and was monitored with ultrasound imaging. Subsequent cross-sectional imaging revealed that this was, in fact, a large mediastinal abscess, eroding the manubrium and lying within close proximity of the aorta. The patient was eventually referred to a cardiothoracic unit for complete evacuation of this lesion. Following a prolonged illness and treatment period, the patient recovered well and successfully resumed employment.

Modified-release hydrocortisone to provide circadian cortisol profiles

CONTEXT

Cortisol has a distinct circadian rhythm regulated by the brain's central pacemaker. Loss of this rhythm is associated with metabolic abnormalities, fatigue, and poor quality of life. Conventional glucocorticoid replacement cannot replicate this rhythm.

OBJECTIVES

Our objectives were to define key variables of physiological cortisol rhythm, and by pharmacokinetic modeling test whether modified-release hydrocortisone (MR-HC) can provide circadian cortisol profiles.

SETTING

The study was performed at a Clinical Research Facility.

DESIGN AND METHODS

Using data from a cross-sectional study in healthy reference subjects (n = 33), we defined parameters for the cortisol rhythm. We then tested MR-HC against immediate-release hydrocortisone in healthy volunteers (n = 28) in an open-label, randomized, single-dose, cross-over study. We compared profiles with physiological cortisol levels, and modeled an optimal treatment regimen.

RESULTS

The key variables in the physiological cortisol profile included: peak 15.5 microg/dl (95% reference range 11.7-20.6), acrophase 0832 h (95% confidence interval 0759-0905), nadir less than 2 microg/dl (95% reference range 1.5-2.5), time of nadir 0018 h (95% confidence interval 2339-0058), and quiescent phase (below the mesor) 1943-0531 h. MR-HC 15 mg demonstrated delayed and sustained release with a mean (sem) maximum observed concentration of 16.6 (1.4) microg/dl at 7.41 (0.57) h after drug. Bioavailability of MR-HC 5, 10, and 15 mg was 100, 79, and 86% that of immediate-release hydrocortisone. Modeling suggested that MR-HC 15-20 mg at 2300 h and 10 mg at 0700 h could reproduce physiological cortisol levels.

CONCLUSION

By defining circadian rhythms and using modern formulation technology, it is possible to allow a more physiological circadian replacement of cortisol.

Free triiodothyronine has a distinct circadian rhythm that is delayed but parallels thyrotropin levels

CONTEXT

TSH is known to have a circadian rhythm, but the relationship between this and any rhythm in T(4) and T(3) has not been clearly demonstrated.

OBJECTIVE

With a view to optimizing thyroid hormone replacement therapy, we have used modern assays for free T(4) (FT4) and free T(3) (FT3) to investigate circadian rhythmicity.

SETTING

The study was performed at a university hospital.

DESIGN AND SUBJECTS

This was a cross-sectional study in 33 healthy individuals with 24-h blood sampling (TSH in 33 and FT4 and FT3 in 29 individuals) and cosinor analysis.

RESULTS

Of the individuals, 100% showed a sinusoidal signal in TSH, for FT4 76%, and for FT3 86% (P < 0.05). For FT4 and FT3, the amplitude was low. For TSH the acrophase occurred at a clock time of 0240 h, and for FT3 approximately 90 minutes later at 0404 h. The group cosinor model predicts that TSH hormone levels remain above the mesor between 2020 and 0820 h, and for FT3 from 2200-1000 h. Cross correlation of FT3 with TSH showed that the peak correlation occurred with a delay of 0.5-2.5 h. When time-adjusted profiles of TSH and FT3 were compared, there was a strong correlation between FT3 and TSH levels (rho = 0.80; P < 0.0001). In contrast, cross correlation revealed no temporal relationship between FT4 and TSH.

CONCLUSIONS

FT3 shows a circadian rhythm with a periodicity that lags behind TSH, suggesting that the periodic rhythm of FT3 is due to the proportion of T(3) derived from the thyroid. Optimizing thyroid hormone replacement may need to take these rhythms into account.

Modified-release hydrocortisone for circadian therapy: a proof-of-principle study in dexamethasone-suppressed normal volunteers

BACKGROUND

All existing long-term glucocorticoid replacement therapy is suboptimal as the normal nocturnal rise and waking morning peak of serum cortisol is not reproduced.

AIM

To test whether it is possible to reproduce the normal overnight rise and morning peak in serum cortisol using an oral delayed and sustained release preparation of hydrocortisone (Cortisol(ds)).

SUBJECTS AND METHODS

Six healthy normal male volunteers attended on two occasions, in a single-dose, open-label, nonrandomized study. Endogenous cortisol secretion was suppressed by administration of dexamethasone. Cortisol(ds) (formulation A or B) was administered at 2200 h on day 1. Blood samples for measurement of cortisol were taken from 2200 h every 30 min until 0700 h, then hourly until 2200 h on day 2. Fifteen body mass index (BMI)-matched control subjects had serum cortisol levels measured at 20-min intervals for 24 h. Serum cortisol profiles and pharmacokinetics after Cortisol(ds) were compared with those in controls.

RESULTS

Formulations A and B were associated with delayed drug release (by 2 h and 4 h, respectively), with median peak cortisol concentrations at 4.5 h (0245 h) and 10 h (0800 h), respectively, thereby reproducing the normal early morning rise in serum cortisol. Total cortisol exposure was not different from controls.

CONCLUSIONS

For the first time we have shown that it is possible to mimic the normal circadian rhythm of circulating cortisol with an oral modified-release formulation of hydrocortisone, providing the basis for development of physiological circadian replacement therapy in patients with adrenal insufficiency.

Late endocrine, metabolic and skeletal sequelae following treatment of childhood cancer

With an ever increasing adult population of childhood cancer survivors there is a need to focus on the late effects of cancer therapy. It is essential that, after discharge from the paediatric oncologists, the patients are not lost from the health system but are under continued surveillance with access to the appropriate physicians. Endocrine and metabolic consequences may affect a patient's life both soon after cancer treatment and also for many years in the future. In this review we consider the following potential problems: growth hormone deficiency and replacement in adulthood, cardiovascular risk factors, osteopaenia, thyroid and parathyroid dysfunction.