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Strongbridge Biopharma plc Announces Top-Line Results from Extended Evaluation Phase of the Pivotal Phase 3 SONICS Study of RECORLEV™ (levoketoconazole) for the Potential Treatment of Endogenous Cushing’s Syndrome

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Tuesday, March 12, 2019

DUBLIN, Ireland and TREVOSE, Pa. -- Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, announced the top-line findings from the extended evaluation phase of the pivotal Phase 3 SONICS study of RECORLEV™ (levoketoconazole) for the potential treatment of endogenous Cushing’s syndrome. The purpose of the six-month extended evaluation phase was to evaluate the long-term safety, tolerability and benefit-risk during chronic use of RECORLEV.

“We are encouraged by the top-line results from the SONICS extended evaluation phase. RECORLEV™ (levoketoconazole) treatment was associated with no new clinically relevant liver-related findings or other new safety signals, while demonstrating long-term efficacy to reduce mean urinary free cortisol, or mUFC, as well as key cardiovascular risk markers such as weight and LDL-cholesterol,” said Fredric Cohen, M.D., chief medical officer of Strongbridge Biopharma. “A Type C meeting with FDA is progressing as planned in the first quarter of 2019 to seek guidance on the regulatory path forward to obtain marketing approval for RECORLEV for the treatment of endogenous Cushing's syndrome, and we anticipate providing an update in the second quarter of 2019.”

RECORLEV was generally well-tolerated during the extended evaluation phase and no new drug-related safety signals were observed:

  • 60 out of 61 study participants who completed the maintenance phase elected to participate in the extended evaluation phase
  • Of the 60 patients that entered the extended evaluation phase, 46 patients completed it
  • Data were collected twice, at three-month intervals, which is common practice for the long-term follow-up of chronic medical therapy for endogenous Cushing’s syndrome
  • Four patients (6.7%) discontinued due to adverse events
  • No patients (0%) experienced an increase in either alanine aminotransferase (ALT) or aspartate aminotransferase (AST) greater than three times (3x) the upper limit of normal and there were no (0%) reported adverse events of special interest (AESI) related to liver injury or dysfunction
  • The most commonly reported (≥5%) treatment-emergent adverse events (TEAEs) in the extended evaluation phase were arthralgia (7%), QTc prolongation (7%), headache (7%), hypokalemia (7%), and nasopharyngitis (5%); QTc prolongation greater than 460 msec was not observed in the extended evaluation phase
  • Nausea (2%) and headache (7%) were reported at lower rates as compared to the previously reported aggregate rates of 32% (nausea) and 28% (headache) from the dose titration and maintenance phases

Summary of RECORLEV extended evaluation phase efficacy results:

  • In this exploratory evaluation, an observed-case analysis of completers was used to evaluate mUFC responders
  • At the end of the extended evaluation phase, normalization of mUFC was observed in 41% of patients, and normalization of, or at least 50% improvement in, mUFC was observed in 68% of patients
  • Clinically meaningful improvements in key cardiovascular risk markers (hemoglobin A1c, fasting glucose, total and LDL-cholesterol) were observed throughout the extended evaluation phase
  • Weight loss and reduction in body mass index (BMI) continued throughout the extended evaluation phase

About the SONICS Study
SONICS is an open-label, Phase 3 study of RECORLEV as a treatment for endogenous Cushing’s syndrome that enrolled 94 patients at centers in North America, Europe and the Middle East. Following a screening phase, SONICS has three treatment phases:

(1) Dose Titration Phase: Patients started RECORLEV at 150 mg twice daily (300 mg total daily dose) and titrated in 150 mg increments with the goal of achieving a therapeutic dose – a dose resulting in mean UFC normalization – at which point titration was stopped; (2) Maintenance Phase: The dose was fixed and should not have been changed other than for safety reasons or loss of efficacy. At the end of the six-month maintenance phase, the mean UFC response rate was measured; and (3) Extended Evaluation Phase: Patients continued on RECORLEV for another six months to evaluate long-term safety and tolerability and explore efficacy durability.

About Strongbridge Biopharma
Strongbridge Biopharma is a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs. Strongbridge’s commercial portfolio within its rare endocrine franchise includes RECORLEV™ (levoketoconazole), a cortisol synthesis inhibitor currently being studied in Phase 3 clinical studies for the treatment of endogenous Cushing’s syndrome, and veldoreotide extended release, a pre-clinical next-generation somatostatin analog being investigated for the treatment of acromegaly and potential additional applications in other conditions amenable to somatostatin receptor activation. Both RECORLEV and veldoreotide have received orphan drug designation from the FDA and the European Medicines Agency. The Company’s rare neuromuscular franchise includes KEVEYIS® (dichlorphenamide), the first and only FDA-approved treatment for hyperkalemic, hypokalemic, and related variants of primary periodic paralysis. KEVEYIS has orphan drug exclusivity in the United States.

Source: strongbridgebio
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