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Impact of Diabetes and Metformin Use on Enteropancreatic Neuroendocrine Tumors: Post Hoc Analysis of the CLARINET Study.

ABSTRACT: The prognostic role of diabetes mellitus (DM) in advanced enteropancreatic neuroendocrine tumors (NETs) is unclear. Progression free survival (PFS) was assessed in post-hoc analyses of the 96-week, phase III, double-blind, placebo-controlled CLARINET study of lanreotide 120 mg in patients with advanced non-functional enteropancreatic NETs with DM (with/without metformin) and without DM. Of 204 patients, there were 79 with DM (lanreotide, n = 42 {metformin, n = 14}; placebo, n = 37 {metformin, n = 10}) and 125 without DM (lanreotide, n = 59; placebo, n = 66). Median PFS was 96.0 and 98.0 weeks with and without DM, respectively (hazard ratio 1.20 {95% confidence interval 0.79 to 1.82}; p = 0.380). No difference in PFS was observed in lanreotide-treated patients with/without DM (p = 0.8476). In the placebo group, median PFS was numerically shorter with versus without DM (p = 0.052) and was significantly longer in patients with DM and metformin (85.7 weeks) versus without metformin (38.7 weeks; p = 0.009). Multivariable Cox analyses showed that DM at baseline was not associated with PFS (p = 0.079); lanreotide was significantly associated with lower disease progression risk (p = 0.017). Lanreotide efficacy was confirmed in patients with advanced enteropancreatic NETs, regardless of diabetic status; DM was not a negative prognostic factor. A potential antitumor effect of metformin was observed in patients receiving placebo.

SUBMITTER: Pusceddu S

PROVIDER: S-EPMC8750688 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:IntroductionTumor quantity while receiving cancer therapy is the sum of simultaneous regression of treatment-sensitive and growth of treatment-resistant fractions at constant rates. Exponential rate constants for tumor regression/decay (d) and growth (g) can be estimated. Previous studies established g as a biomarker for overall survival; g increases after treatment cessation, can estimate doubling times, and can assess treatment effectiveness in small cohorts by benchmarking to large reference data sets. Using this approach, we analyzed data from the clinical trial CLARINET, evaluating lanreotide depot/autogel 120 mg/4 weeks (LAN) for treatment of neuroendocrine tumors (NETs).Methods and materialsComputed tomography imaging data from 97 LAN- and 101 placebo-treated patients from CLARINET were analyzed to estimate g and d.ResultsData from 92% of LAN- and 94% of placebo-treated patients could be fit to one of the equations to derive g and d (p < .001 in most data sets). LAN-treated patients demonstrated significantly slower g than placebo recipients (p = .00315), a difference of 389 days in doubling times. No significant difference was observed in d. Over periods of LAN administration up to 700 days, g did not change appreciably. Simulated analysis with g as the endpoint showed a sample size of 48 sufficient to detect a difference in median g with 80% power.ConclusionAlthough treatment of NETs with LAN can affect tumor shrinkage, LAN primarily slows tumor growth rather than accelerates tumor regression. Evidence of LAN efficacy across tumors was identified. The growth-retarding effect achieved with LAN was sustained for a prolonged period of time.Implications for practiceThe only curative treatment for neuroendocrine tumors (NETs) is surgical resection; however, because of frequent late diagnosis, this is often impossible. Because of this, treatment of NETs is challenging and often aims to reduce tumor burden and delay progression. A novel method of analysis was used to examine data from the CLARINET trial, confirming lanreotide depot/autogel is effective at slowing tumor growth and extending progression-free survival. By providing the expected rate and doubling time of tumor growth early in the course of treatment, this method of analysis has the potential to guide physicians in their management of patients with NETs.

Project description:IntroductionPatients with rheumatoid arthritis (RA) have decreased survival because of increased cardiovascular risk compared with the general population, and treatment with tocilizumab (TCZ) has been shown to increase lipid levels; however, the relationship between lipids and cardiovascular risk is unknown. This post hoc analysis expanded on previously reported 24-week results by characterizing statin use and subsequent changes in lipid parameters in patients with RA treated with intravenous or subcutaneous TCZ (TCZ-IV or TCZ-SC) over 2 years of treatment.MethodsData were collected from patients with moderate to severe active RA who received ≥1 dose of the study drug in seven international, randomized, double-blind, controlled phase 3 and 4 clinical trials of TCZ-IV or TCZ-SC. Lipid levels and safety events were assessed over 2 years of treatment. Data were summarized for all pooled treatment groups of the intention-to-treat populations in the TCZ-IV and TCZ-SC studies, and results were stratified by concomitant statin use.ResultsData from this descriptive, retrospective, pooled analysis indicated that statins can stabilize lipid levels without a clinically significant increase in adverse events. Approximately 30% of patients in the TCZ treatment arms who never received a statin demonstrated a shift in low-density-lipoprotein cholesterol (LDL-C) from <130 mg/dl at baseline to ≥130 mg/dl at 2 years. However, despite the increased potential cardiovascular risk, <15% of patients with LDL-C ≥100 mg/dl and <35% of patients with a total cholesterol:high-density-lipoprotein cholesterol ratio >5 at 2 years were receiving concomitant statins.ConclusionConcomitant statin use attenuated TCZ-mediated lipid increases; however, a large proportion of TCZ-treated patients potentially at risk of cardiovascular disease were untreated. These findings highlight the need for better understanding of potential risk associated with TCZ-mediated lipid elevations as well as implementation of RA-specific guidelines on the recognition and management of elevated risk of cardiovascular events in patients with RA.FundingF. Hoffmann-La Roche, Ltd.

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Impact of Diabetes and Metformin Use on Enteropancreatic Neuroendocrine Tumors: Post Hoc Analysis of the CLARINET Study.

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