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- W3023173837 abstract "Abstract Background: Injectable somatostatin receptor ligands (SRLs) are the most widely used therapy to control acromegaly. Oral octreotide capsules have been formulated as a potential therapy for this disorder and the efficacy and safety was evaluated in the CHIASMA OPTIMAL prospective phase 3 study in patients with acromegaly who were controlled on injectable SRL treatment of varying doses (Samson et al. ENDO 2020). Methods: Patients with confirmed acromegaly, who had been receiving a stable dose of injectable SRL (≥3 months) up until study entry, were randomized to receive octreotide capsules (40 mg/day) or placebo for 36 weeks. Patients were dose titrated to 60 or 80 mg of oral octreotide or equivalent placebo through week 24 at the investigator’s discretion based on increase of IGF-I levels or worsening of acromegaly signs and symptoms. The primary efficacy endpoint was the proportion of patients who maintained their biochemical response at the end of 36 weeks, defined as average IGF-I ≤1 x ULN between Weeks 34 and 36. An analysis evaluated maintenance of response based on prior dose of injectable SRL. Prior doses of injectable SRL were categorized based on the following classifications: octreotide 10 mg every 4 weeks or lanreotide 60 mg every 4 weeks or 120 mg every 8 weeks were stratified as low; octreotide 20 mg every 4 weeks or lanreotide 90 mg every 4 weeks or 120 mg every 6 weeks were stratified as medium; octreotide 30 mg or 40 mg or lanreotide 120 mg every 4 weeks were stratified as high. Randomization was stratified based on low dose vs med/high dose and efficacy results compared for these strata. The response rates reported for the primary end point are slightly adjusted for stratification differences as prespecified in the statistical analysis plan. Results: Six patients (21.4%) in the octreotide capsule group had received prior treatment with low doses of injectable SRLs while 22 (78.6%) had received prior treatment with medium-high doses of injectable SRLs. Maintenance of response was observed in 16 patients receiving oral octreotide. This included 66.7% of patients (n=4) previously receiving low doses of injected SRLs and 54.5% of patients (n=12) on medium-high injected doses. The treatment effect was consistent irrespective of prior dose of injectable SRL (odds ratio: 5.4 in low dose and 5.9 in medium-high dose). Conclusion: The CHIASMA OPTIMAL study recruited a population receiving predominantly medium-high doses of injectable SRLs and demonstrated maintenance of response in 58% of patients. Oral octreotide treatment effect was consistent irrespective of prior dose of injectable SRL." @default.
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- W3023173837 date "2020-04-01" @default.
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- W3023173837 title "MON-LB53 Prior Injectable Somatostatin Receptor Ligand Dose Does Not Predict Oral Octreotide Response In The Treatment Of Acromegaly: Results From The Phase 3 OPTIMAL Study" @default.
- W3023173837 doi "https://doi.org/10.1210/jendso/bvaa046.2121" @default.
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