Jarrod Longcor
Analyst · SeeThruEquity. Your line is open
Thank you, Jim. Before I review our clinical progress, it continues to be worth noting that multiple myeloma is an incurable malignancy of the plasma cells which is part of the B-cell lineage of immune cells diagnosed in approximately 30,000 Americans each year, thus qualifying as an orphan disease. This hematological cancer is characterized by both diffuse distribution and radio sensitivity suggesting a systemic radio therapeutic such as CLR 131 may have a role in the treatment of this challenging disease. While available options generally treat newly diagnosed disease, myeloma usually recurs in both treatment response rates as well as time-to-disease progression dropped significantly in the relapsed refractory setting. As a result, and despite recent expansions in treatment options, high unmet medical need remains in this arena. Given that there are limited treatment options currently available in the refractory setting and based on clinical benefits already observed with CLR 131 and heavily pre-treated relapse refractory patient population, we remain optimistic regarding the potential clinical and quality of life benefits that CLR 131 may provide to patients with relapse refractory multiple myeloma. As Jim stated earlier, we recently completed the second cohort of Phase I clinical study and it’s difficult to treat patient population evaluating the safety and tolerability of escalating doses of CLR 131. Please remember that this Phase I study is designed to help determine the maximum tolerated dose and what the potential therapeutic dose could be for this indication. Along with the studies investigators and independent data monitoring committees, we have been closely observing and evaluating both safety and efficacy signals and are extremely encouraged with the overall performance of a single dose CLR 131. In the first cohort patients, patients received a single dose of 12.5 millicuries per meter squared over a 30 minute infusion and impressively four of four evaluable patients achieved stable disease. Two patients achieved M-protein drop of approximately 20% and 30%. As a reminder, M-protein is a surrogate marker of efficacy and according to the International Myeloma Working Group, a drop of 50% or greater is considered a partial response in this patient population. These same patients that achieved the reduction previously received a 50% or greater drop in another important surrogate market of efficacy the Free Light Chain or FLC marker. According to the International Multiple Myeloma Working Group, in the absence of M-protein, a reduction of 50% or greater from base line is considered a partial response when measuring FLC. Most importantly, Cohort 1 patients achieved progression-free survival or PFS for an average of three months. During the third quarter, we announced the completion of the second cohort and similar to Cohort 1 all four evaluable patients achieved stable disease. The second cohort received a 50% dose increase to 18.75 millicuries per meter squared from 12.5 millicuries per meter squared. Two of four patients in this cohort achieved a 50% or greater FLC reduction from base line and the responses were deeper and more sustained as compared to Cohort 1. As of October 7, 2016, patients in the second cohort had obtained an average PFS of 120 days representing a 30% increase compared to the first cohort. It is important to note that as of this call, PFS continues for two out of the four evaluable patients in Cohort 2. To provide context regarding CLR 131’s interim PFS of greater than 120 days, two recently approved drugs for relapsed refractory multiple myeloma, achieved a 111 days and 120 days of PFS in their pivotal studies, which means CLR 131 at a single dose of 18.75 millicuries per meter squared achieved similar or greater PFS than these compounds. As striking as CLR 131’s activity has been, its adverse event profile has been equally impressive. Despite the 50% increase in dose, the adverse event profile for the second cohort did not increase from the first cohort to the second cohort with medium adverse events being two events per patient and medium grade of severity of adverse event being two out of five with five being the most severe. Including the eight evaluable patients from this study and the 28 total patients treated with CLR 131, there have been no neuropathies, cardiotoxicities, gastrointestinal upset or irritation nor deep vein thrombosis adverse events reported with the use of CLR 131. As expected, the most common adverse events seen are hematologic in nature. Although previously stated, I’d like to step back a moment and remind participants on this call that CLR 131 is administered as a 30 minute single dose infusion at the beginning of the evaluable period. Please also recall that this study is designed to evaluate CLR 131 in a heavily pre-treated patient population with progressive disease, some of whom have undergone as many as 12 lines of prior therapy. In fact, Cohort 1 had 6.5 lines of prior therapy as the average, four if not including the patient reference with the 12 lines of prior therapy. Cohort 2 also had four prior lines of therapy as the average in CLR 131 patients, this line of systemic treatment. All evaluable patients had previously received treatment with a proteasome inhibitor and immunomodulatory drug as well as treatments consisting of three drugs also called triple combination. These combination treatments are considered a single line of therapy. In addition, four of the eight evaluable patients also received stem cell transplantation. Based on the clear demonstration of activity and extended level of progression free survival outlined along with a very clean adverse event profile, the data monitoring committee fully endorsed and the company rapidly initiated the study’s third cohort. The Cohort 3 CLR 131 dose is 25 millicuries per meter squared which represents a 33% increase from the 18.75 millicuries per meter squared dose using Cohort 2. As previously stated, we have initiated enrollment and look forward to sharing data from this cohort when it becomes available. Recently, the company announced the design of our NCI supported Phase II study of CLR 131 in relapsed refractory multiple myeloma and other selected relapsed refractory hematological cancers. Originally, the company provided guidance that this study would be initiated in the first half of 2017. Thanks to the collective effort of the team which included our employees, our contract research organization and investigators and consultants, we accelerated our study initiation guidance to the first quarter of 2017 and announced that preliminary efficacy data was expected in the second half of 2017. The Phase II study design was carefully constructed to optimize our understanding of CLR 131 by further defining its clinical benefits in a both a single and multi-dose regime for the treatment of relapse refractory multiple myeloma. The results of which we believe will be instrumental of a pivotal clinical trial. Based on our evaluation, we believe CLR 131 may also provide therapeutic benefit in a number of orphan designated, difficult to treat hematological cancers that clinically and commercially attractive in design, the Phase II study to rapidly and cost effectively explore the drug’s broader clinical utility. The study will be conducted in up to 15 centers across the United States. The company expects that all patients will receive a single dose of CLR 131 at 25 millicuries per meter squared infused over approximately 30 minutes, with the option of a second dose approximately 80 days to 160 days later based upon physician assessment. Concurrently, patients in the trial with relapsed refractory multiple myeloma will be receiving 40 milligrams oral dexamethasone weekly for up to 12 weeks. The primary endpoint for the study is Objective Response Rate or ORR; secondary endpoints include progression free survival and other measures of efficacy. In relapsed refractory multiple myeloma patients, efficacy responses will be determined according to the latest International Multiple Myeloma Working Group criteria while in lymphomas, efficacy will be determined by according to the Lugano criteria. With that, I’m pleased to turn the call back over to Jim.