Pam Palmer
Analyst · Jefferies. Please go ahead
Thanks, Vince. First, I'd like to thank all the patients, physicians and nurses for their participation in the study. The IAP312 study enrolled a total of 320 hospitalized post-operative patients, who use ZALVISO for up to 72 hours to manage their moderate to severe acute pain. Patients were considered a completer if they successfully completed at least 24 hours in this study following the first dose of study medication. There was no primary efficacy endpoint but rather a list of study objectives, including those requested by the FDA. At least 315 patients were required to be enrolled in order for the study to have a 90% power to demonstrate that the upper limit of a 90% confidence interval of the device error rate during patient use was not greater than 5%. We enrolled a wide range of patients of different ages, surgeries and comorbidities. Specifically, patients who participated in the study were 60% female and the average age of all study participants was 57 years, with 38% aged 65 or older. 41% of patients had a BMI of greater than 30. The majority of patients underwent either knee replacement surgery, 25%; hip replacement surgery, 24% or major open abdominal surgery, 21%. Approximately 91% of patients completed this study with the reasons for dropping out prior to 24 hours being inadequate analgesia, 2.5%; adverse event, 1.9%; early discharge, 1.6% and various other reasons which totaled 3.5%. Regarding device functionality, the occurrence of a device error during patient use occurred in 2.2% of the patients enrolled in IAP312 over the course of up to 72 hours of treatment and the upper limit of a 90% confidence interval was 4.1%, which was lower than the protocol's target of 5%. Moreover, this rate was statistically lower, p-value less than 0.001 than the 7.9% rate of device errors during patient use previously reported for an earlier version of ZALVISO device evaluated in the prior Phase 3 study IAP311. Regarding misplaced tablets, throughout the IAP312 study, patients self-administered a total of 7,293 sufentanil tablets. Per the updated ZALVISO treating instructions electronically displayed on the handheld device, six patients called the nurse when they failed to properly self-administer a single tablet to allow for proper retrieval and disposal of the tablet. Also during inspection by the nurse, which occurred every two hours per protocol, a total of seven misplaced tablets or less than 0.1% of total dispensed tablets were discovered with six additional patients. No patient had a repeat incident under an inadvertent misplaced tablet following retraining on the device. This combination of patient training and nurse inspections, along with the tracking feature of the ZALVISO device could potentially address the FDA's concerns regarding drug accountability. With respect to measuring the efficacy in this study, patients entered with a baseline score of 5.8 on average on a rating scale of zero to 10 with 10 being the worst imaginable pain. Mean pain scores from the first time point at 15 minutes and all subsequent time points were statistically improved from baseline with a p-value of less than 0.001. A mean decrease of 1.3 on the 11-point NRS scale, which has been reported in the literature as a clinically significant reduction in pain intensity in post-operative patients, occurred between the 15 and 30 minute time point in this study. After each 24-hour period throughout the studies, the Patient Global Assessment, or PGA, of the method of pain control, which measured the patient satisfaction with their quality of analgesia, was recorded. At the same time, Healthcare Professional Global Assessment, or HPGA, of the method of pain control was also recorded. Patient ratings at 24, 48 and 72 hours show that 86%, 89% and 100%, respectively, had PGA ratings of good or excellent. Similar ratings were recorded by healthcare professionals on the HPGA, with 91%, 95% and 100%, respectively reporting good or excellent. From a safety standpoint, ZALVISO was shown to be well-tolerated by study participants with no adverse events reported for 41% of patients. The three most frequent adverse events were nausea 26%, hypotension 11% and vomiting 10%. A total of five patients experienced serious adverse events but all were considered unrelated to study drug by investigators. At this point, I would like to turn the call over to Dr. Harold Minkowitz, who has been a principal investigator in not only the IAP312 study, but many of our ZALVISO clinical trials. He is an anesthesiologist at Memorial Hermann Hospital in Houston, Texas and a well-known acute pain clinical researcher. Dr. Minkowitz, can you speak to your clinical observations and experience with the ZALVISO system for treating post-operative pain?