Hyperglycaemia and Ischaemia Impair Wound Healing via Toll-like Receptor 4 Pathway Activation in vitro and in an Experimental Murine Model.

OBJECTIVE: Diabetes mellitus has reached epidemic proportions. Foot ulceration is a multifactorial complication of diabetes associated with marked morbidity and mortality. Innate immune Toll-like receptor 4 (TLR4) mediated inflammation has been implicated in the systemic pathogenesis of diabetes and may contribute to impairment of wound healing. This study investigates the effect of high glucose and hypoxic conditions on TLR4 activation and signalling in vitro and in vivo. METHODS: Fibroblasts cultured at physiological glucose concentration (5.5 mM) were exposed to glucose concentrations from 0 mM to 25 mM, with duplicates placed in a hypoxic chamber. TLR4 inhibition was assessed in the 25 mM glucose groups. Diabetes was induced in wild type (WT) and TLR4 knockout (KO) C57BL/6 mice by intraperitoneal injection of low dose streptozocin (STZ). Hindlimb ischaemia was induced by femoral artery ligation four weeks post streptozocin, and a full thickness 4 mm skin wound inflicted below the knee. Wound healing was assessed via digital planimetry on days 3, 7, and 14 post surgery. RESULTS: Hypoxic and high glucose (25 mM) conditions led to an increase in TLR4 protein expression, apoptosis, and interleukin (IL)-6 release. Inhibition with a TLR4 neutralising antibody and specific TLR4 antagonist ameliorated the effects of high glucose and ischaemia (p < .05). In vivo, wound healing was significantly impaired in the diabetic ischaemic group at day 14 (p < .05). Diabetic ischaemic wounds in TLR4 KO mice exhibited significantly improved healing rates compared with those in WT mice at all time points. CONCLUSION: Hypoxia stimulates upregulation of TLR4 protein expression and this effect is exaggerated by hyperglycaemia. In TLR4 KO mice, there is a significant improvement in the healing of diabetic ischaemic wounds compared with WT. It is suggested that a synergistic effect between hypoxia and hyperglycaemia impairing wound healing exists, through TLR4 mediated inflammation.

Real-world study on the characteristics, post-nephrectomy journey, and outcomes of patients with early-stage renal cell carcinoma based on risk groups.

OBJECTIVES: To examine real-world characteristics, journey, and outcomes among patients with locoregional, nonmetastatic renal cell carcinoma (RCC). METHODS: A retrospective analysis of medical records from the ConcertAI Oncology Dataset was performed on adults in the United States with newly diagnosed nonmetastatic RCC between January 2012-December 2017 who received surgical treatment, and were followed until August 2021. Patients were stratified based on the risk of recurrence after nephrectomy. Recurrence rate and survival outcomes were assessed. RESULTS: The cohort (n = 439) had a median age of 64 years, 66.1% were male, and 76.5% had clear-cell histology. The median follow-up time from nephrectomy was 39.3 months overall, 41.0 months for intermediate-high-risk patients (n = 377; 85.9%) and 24.1 months for high-risk patients (n = 62; 14.1%). For intermediate-high- and high-risk patients, respectively, 68.4% and 56.5% had ≥1 medical oncologist visit after nephrectomy. Of 260 patients with documentation of postoperative imaging assessments, 72% were ordered by medical oncologists, and the median time from initial nephrectomy to the first scan was 110 days (intermediate-high-risk) and 51 days (high-risk). Provider-documented recurrence occurred in 223 (50.8%) patients, of whom 41.7% had ≥1 medical oncologist visit before the recurrence. Three-year disease-free survival (DFS), and overall survival rates were 49.4% and 80.8% (all patients): 27.7% and 64.7% (high-risk); and 52.9% and 83.3% (intermediate-high-risk). CONCLUSIONS: Our study reports low DFS after nephrectomy for patients with intermediate-high- and high-risk RCC. Subsequent approval and use of new and newly approved adjuvant therapeutic options could potentially delay or prevent recurrence.

Patient profiles, treatment patterns, and outcomes among persistent, recurrent, or metastatic cervical cancer patients under routine care in the United States.

OBJECTIVE: Patients with persistent, recurrent, or metastatic cervical cancer have poor prognosis. While recent advances have expanded treatment options, real-world data on treatment patterns and outcomes in this population are lacking. METHODS: This retrospective study identified adult females with persistent, recurrent, or metastatic cervical cancer from the ConcertAI Oncology Dataset who received systemic therapy on or after August 15, 2014. Patients were followed from persistent, recurrent, or metastatic diagnosis through third-line (3 L) therapy, death, end of record, or study end (June 2021). Data collection included patient characteristics, treatment patterns, and clinical outcomes. Kaplan-Meier methods were used for the three most common first-line (1 L) regimens to analyze real-world time on treatment (rwToT), real-world progression-free survival (rwPFS), and real-world overall survival (rwOS). Analyses were stratified by bevacizumab receipt by treatment line. RESULTS: 307 patients were included (mean [standard deviation] age 51.5 [13.2] years, 70.7% White). 91.2% of patients had metastatic disease, 8.5% had persistent disease, and <1% had recurrent disease. The most common 1 L regimen was carboplatin+paclitaxel+bevacizumab (40.7%) with median (95% confidence interval [CI]) rwToT of 3.5 (2.9-4.4) months. 57.0% of patients proceeded to second line (2 L), and 25.7% went to 3 L. Median (95% CI) rwPFS was 7.2 (6.4-8.1) months, and median (95% CI) rwOS was 16.5 (14.2-19.9) months, from initiation of 1 L. CONCLUSIONS: 1 L regimens received in patients with persistent, recurrent, or metastatic cervical cancer generally followed clinical guidelines, and the rwOS agrees with clinical trials. This study highlights the burden of disease and unmet need for specific treatments in these patients.

Potential of Novel EPO Derivatives in Limb Ischemia.

Erythropoietin (EPO) has tissue-protective properties, but it increases the risk of thromboembolism by raising the haemoglobin concentration. New generation of EPO derivatives is tissue protective without the haematopoietic side effects. Preclinical studies have demonstrated their effectiveness and safety. This paper summarizes the development in EPO derivatives with emphasis on their potential use in critical limb ischaemia.