EX-99.2 3 a13-11872_1ex99d2.htm EX-99.2

Exhibit 99.2

 

Poster 411

APS 2013, New Orleans, LA

rvickery@theravance.com

 

TD-1211 Demonstrates a Durable Increase in Bowel Movement Frequency and Return

Toward Normal Bowel Function in a 5-Week Phase 2b Opioid-Induced Constipation Study

 

Ross Vickery(1), Yu-Ping Li(1), Ullrich Schwertschlag(1), Neil Singla(2), Lynn Webster(3), and Daniel Canafax(1)

 


(1) Theravance, Inc., South San Francisco, CA; (2) Lotus Clinical Research, Inc., Pasadena, CA; (3) CRI Lifetree, Inc., Salt Lake City, UT

 

Introduction

 

·                  Opioid analgesics such as morphine continue to play a critical role in chronic cancer and non-cancer pain control.(1) Despite their effectiveness, opioids have significant drawbacks, notably the development of analgesic tolerance and physical dependence, sedation, respiratory depression and bowel dysfunction.(2)

·                  Opioid-induced constipation (OIC) is common, affecting up to 80% of patients receiving opioids for chronic non-cancer pain.(3)

·                  TD-1211 is an investigational, peripherally selective, mu-opioid receptor antagonist designed to alleviate gastrointestinal side effects of opioid therapy without affecting analgesia.

·                  Safety and efficacy results, including the primary and key secondary endpoints, from a 5-week, Phase 2b study in chronic non-cancer pain OIC patients have been previously reported (see also APS 2013 Poster #421).(4)

·                  As mu-opioid receptor antagonists can quickly reverse the effects of opioid agonists on gastrointestinal opioid receptors, demonstration of a sustained response on bowel movement frequency is necessary for a therapy intended for patients taking opioids chronically.

·                  Therefore, additional pre-specified week-by-week efficacy analyses are reported here.

 

Methods

 

·                  A 5-week, double-blind, randomized, multi-center, placebo-controlled, parallel-group study was conducted in chronic non-cancer pain patients with OIC, defined as <5 spontaneous bowel movements (SBMs) over a 2-week baseline period and at least one additional symptom of constipation in at least 25% of the bowel movements.

·                  For the first 4 days of dosing, patients randomized to TD-1211 received 5mg daily and on Day 5, remained at 5mg or were dose-escalated to 10mg or 15mg daily for the remainder of the treatment period. Patients randomized to placebo received placebo for all 5 weeks.

·                  For at least 14 days prior to Day 1, patients were on a stable chronic opioid regimen, with a total daily dose of >30mg morphine equivalent units (MEU).

·                  Patients were required to stop laxatives and bowel regimens, except protocol-permitted rescue bisacodyl use, throughout the study.

·                  Electronic diaries collected frequency, timing, and symptoms of bowel movements; use of laxatives and opioids; daily pain scores; and satisfaction / quality of life metrics.

·                  Week 1 was excluded from the primary analysis in order to confirm the durability of response and predictability of longer term efficacy studies.

 

Results

 

Patient baseline demographics

 

·                  As shown in Table 1, baseline characteristics were similar for all treatment groups.

·                  Subjects were on a representative spectrum of opioids.

·                  Daily opioid doses ranged from 30-1740 oral MEU.

·                  Back pain was the most commonly reported reason for chronic opioid use.

 

Table 1: Patient Baseline Demographics

 

 

 

TD-1211

 

 

 

Placebo

 

5 mg

 

10 mg

 

15 mg

 

Modified Intent to Treat Population

 

(N=54)

 

(N=55)

 

(N=53)

 

(N=53)

 

Mean Age (years)

 

47.6

 

48.3

 

49.2

 

48.9

 

Female Gender

 

28

 

37

 

32

 

30

 

BMI Mean (kg/m2)

 

28.3

 

27.8

 

27.8

 

28.1

 

Duration of OIC Mean (years)

 

5.5

 

6.4

 

6.7

 

5.3

 

 

Durability of Response

 

·                  An increase in complete spontaneous bowel movements (CSBMs) was observed in Week 1 vs. baseline for each treatment group (Figure 1). The increased CSBMs per week was sustained for each week during Weeks 2-5, ranging from between 2.5 to 3.3 for 10mg TD-1211 patients, 2.5 to 2.9 for 15mg TD-1211 patients, and 0.9 to 1.2 for placebo patients.

·                  Similarly, an increase in SBMs was observed in Week 1 vs. baseline for each treatment group (Figure 2). The increased SBMs per week was sustained for each week during Weeks 2-5, ranging from between 4.1 to 4.9 for 10mg TD-1211 patients, 4.6 to 5.2 for 15mg TD-1211 patients, and 2.6 to 3.3 for placebo patients.

·                  In an exploratory analysis, the mean number of days per week with at least 1 SBM ranged weekly between 3.3 to 3.8 for 10mg TD-1211 patients, 3.6 to 3.9 for 15mg TD-1211 patients, and 2.4 to 2.8 for placebo patients. (Figure 3)

·                  During Weeks 2-5 of treatment, 51-53% of 15mg TD-1211 patients reported >5 SBMs per week compared to 14-29% of placebo patients, indicating a return toward normal bowel function for treated patients. (Figure 4)

 

Tolerability and Safety

 

·                  TD-1211 was generally well tolerated, with overall treatment emergent adverse events (TEAEs) similar between TD-1211 and placebo and gastrointestinal (GI) TEAEs predominant.

·                  The majority of treatment-related GI AEs were associated with initiation of treatment, resolved within a few days, and were mild or moderate.

 

Figure 1: Mean Number of Complete and Spontaneous Bowel Movements (CSBMs) at Each Week

 

 

Figure 2: Mean Number of Spontaneous Bowel Movements (SBMs) at Each Week

 

 

Figure 3: Mean Number of Days per Week with at Least 1 SBM

 

 

Figure 4: Percent of Patients Reporting >5 SBMs per Week on Treatment

 

 

Table 2: GI-Related Adverse Events Occurring After the Dose Initiation Period ( > Day 5)

 

 

 

 

 

TD-1211 Randomization Group

 

 

 

Placebo

 

5 mg

 

10 mg

 

15 mg

 

All

 

 

 

(n=54)

 

(n=56)

 

(n=53)

 

(n=52)

 

(n=161)

 

Any GI-related TEAE of interest

 

3 (5.6%)

 

7 (12.5%)

 

10 (18.9%)

 

3 (5.8%)

 

20 (12.4%)

 

Abdominal pain

 

1 (1.9%)

 

3 (5.4%)

 

4 (7.5%)

 

1 (1.9%)

 

8 (5.0%)

 

Mild

 

1 (1.9%)

 

0

 

3 (5.7%)

 

0

 

3 (1.9%)

 

Moderate

 

0

 

3 (5.4%)

 

1 (1.9%)

 

1 (1.9%)

 

5 (3.1%)

 

Severe

 

0

 

0

 

0

 

0

 

0

 

Abdominal cramping

 

1 (1.9%)

 

1 (1.8%)

 

3 (5.7%)

 

0

 

4 (2.5%)

 

Mild

 

1 (1.9%)

 

0

 

2 (3.8%)

 

0

 

2 (1.2%)

 

Moderate

 

0

 

1 (1.8%)

 

1 (1.9%)

 

0

 

2 (1.2%)

 

Severe

 

0

 

0

 

0

 

0

 

0

 

Diarrhea

 

0

 

4 (7.1%)

 

5 (9.4%)

 

2 (3.8%)

 

11 (6.8%)

 

Mild

 

0

 

0

 

3 (5.7%)

 

2 (3.8%)

 

5 (3.1%)

 

Moderate

 

0

 

3 (5.4%)

 

2 (3.8%)

 

0

 

5 (3.1%)

 

Severe

 

0

 

1 (1.8%)

 

0

 

0

 

1 (0.6%)

 

Nausea

 

1 (1.9%)

 

2 (3.6%)

 

6 (11.3)

 

1 (1.9%)

 

9 (5.6%)

 

Mild

 

1 (1.9%)

 

0

 

5 (9.4%)

 

1 (1.9%)

 

6 (3.7%)

 

Moderate

 

0

 

2 (3.6%)

 

1 (1.9%)

 

0

 

3 (1.9%)

 

Severe

 

0

 

0

 

0

 

0

 

0

 

Vomiting

 

1 (1.9%)

 

2 (3.6%)

 

0

 

0

 

2 (1.2%)

 

Mild

 

0

 

0

 

0

 

0

 

0

 

Moderate

 

1 (1.9%)

 

1 (1.8%)

 

0

 

0

 

1 (0.6%)

 

Severe

 

0

 

1 (1.8%)

 

0

 

0

 

1 (0.6%)

 

 

Tolerability and Safety (con’t)

 

·             At target doses (i.e., after the first 4 days of treatment initiation at 5mg for patients randomized to TD-1211), <13% of all patients reported any GI-related TEAE (Table 2). Two severe AEs (diarrhea and vomiting) were noted.

·             No treatment-related serious adverse events (SAEs) were reported.

·             No clinically significant laboratory, ECG, or vital sign abnormalities were observed.

 

TD-1211 Conclusions

 

·             10mg and 15mg demonstrated a clinically meaningful, sustained response in CSBM and SBM frequency over the duration of the treatment period in OIC patients.

·             CSBM and SBM frequency measures indicated a return toward normal bowel function for the 2 highest doses.

·             Generally well-tolerated with no treatment-related SAEs.

·             Majority of treatment-related GI AEs were associated with initiation of treatment, resolved within a few days, and were mild or moderate.

 


References

 

(1)         Walsh, T.D. (2000). Seminars in Oncology, 27, 45-63.

(2)         Walsh, T.D. (1990). J. Pain Symptom Manage., 5, 362-367.

(3)         Holzer, P. (2012). Current Pharmaceutical Design, 18, 6010-6020.

(4)         Vickery, R., et al. PainWeek 2012, Las Vegas, NV, September 5-8. Poster #121.