ecified patient exit interview sub-study was conducted to assess relevance and clinical meaningfulness of symptom improvements in 35 patients. Questions were asked to blinded participants to further characterise the degree of change experienced during the trial. There were 12 patients who were “very satisfied”, and all of them were on telotristat. The proportions of patients who were “very satisfied” were 0/9 (0%) on placebo, 5/9 (56%) on telotristat ethyl 250 mg tid and 7/15 (47%) on a higher dose of telotristat ethyl.
Overall, 18 patients (13.2%) prematurely discontinued from the study during the DBT Period, 7 patients in the placebo group, 3 in the telotristat ethyl 250 mg group and 8 in the higher dose group. At the conclusion of the 12-week DBT period, 115 patients (85.2%) entered the 36-week open-label extension period, where all patients were titrated to receive a higher dose of telotristat ethyl (500 mg) tid. Patients then entered an extension study (TELEPATH) to eva luate long-term safety of telotristat. In this study, the maximum duration of exposure was more than 5 years.
In a phase 3 study of similar design (TELECAST), a total of 76 patients were eva luated for efficacy. The mean age was 63 years (range 35 to 84 years), 55% were male and 97% were white.
All patients had well-differentiated metastatic neuroendocrine tumour with carcinoid syndrome. Most patients (92.1%) had fewer than 4 BM per day and all except 9 were treated by SSA therapy.
The primary endpoint was the percent change from Baseline in u5-HIAA at Week 12. The mean u5-HIAA excretion at baseline was 69.1 mg/24hours in the 250 mg group (n=17) and 84.8 mg/24 hours in the placebo group (n=22). The percent change from baseline in u5-HIAA excretion at week 12 was +97.7% in the placebo group versus -33.2% in the 250 mg group.
The mean number of daily BM at baseline was 2.2 and 2.5 respectively in the placebo (n=25) and 250 mg group (n=25). The change from baseline in daily BM averaged over 12 weeks was +0.1 and -0.5 in the placebo and 250 mg groups respectively. Telotristat ethyl 250 mg showed that stool consistency, as measured by Bristol Stool Form Scale, was improved compared with placebo. There were 40% patients (10/25) with durable response (as defined in Table 2) in the telotristat ethyl 250 mg group, versus 0% in the placebo group (0/26) (p=0.001).
Paediatric population
The European Medicines Agency has waived the obligation to submit the results of studies with telotristat in all subsets of the paediatric population in the treatment of carcinoid syndrome (see section 4.2 for information on paediatric use).
5.2 Pharmacokinetic properties
The pharmacokinetics of telotristat ethyl and its active metabolite have been characterised in healthy volunteers and patients with carcinoid syndrome.
Absorption
After oral administration to healthy volunteers, telotristat ethyl was rapidly absorbed, and almost completely converted to its active metabolite. Peak plasma levels of telotristat ethyl were achieved in 0.53 to 2.00 hours and those of the active metabolite in 1.50 to 3.00 hours after oral administration. Following administration of a single 500 mg dose of telotristat ethyl (twice the recommended dosage) under fasted conditions in healthy subjects, the mean Cmax and AUC0-inf were 4.4 ng/mL and 6.23 ng•hr/mL, respectively for telotristat ethyl. The mean Cmax and AUC0-inf were 610 ng/mL and 2320 ng•hr/mL, respectively for telotristat.
In patients with carcinoid syndrome on |
