American Society for Microbiology (ASM) Microbe 2019

San Francisco

Details for the upcoming presentations are as follows:

Oral Presentations

Title: Ibrexafungerp (SCY-078) 
Presenter: David Angulo, MD
Date and Time: Monday, June 24, 9:40 am - 10:00 am
Oral Presentation: #7
Session: S378; Antifungals New and Near
Location: 201/202 South

Ibrexafungerp will be highlighted during this special session, "Antifungals New and Near." The session is designed to identify novel antifungal targets and agents in the early discovery phase as well as an update on novel antifungals in late clinical development.

Title: Efficacy of Ibrexafungerp (Formerly SCY-078) in a Murine Therapeutic Model of Pneumocystis Pneumonia 
Presenter: Stephen Barat, PhD
Date and Time: Monday, June 24, 9:40 am - 10:00 am
Oral Presentation: #4
Session: S378; Antifungals New and Near
Location: 201/202 South

The presentation will highlight results demonstrating that ibrexafungerp shows significant activity in a murine treatment model of Pneumocystis pneumonia (PCP). PCP is an opportunistic fungal infection that affects immunocompromised patients, including those infected with HIV, undergoing organ transplants or receiving chemo- or immune-therapy as a cancer treatment. Current therapies to treat PCP have limitations related to efficacy and toxicity. In previously conducted studies, ibrexafungerp showed significant activity in a murine prophylaxis model of PCP. Taken together, these results indicate that ibrexafungerp could potentially be a viable option for managing PCP in immunocompromised patients.

Poster Presentations

Title: Efficacy of Ibrexafungerp (Formerly SCY-078) in the Treatment of Candida auris Cutaneous Infection in a Guinea Pig Model 
Presenter: Mahmoud Ghannoum, PhD
Date and Time: Sunday, June 23, 11:00 am - 1:00 pm
Poster Presentation #: AAR-632
Session: P583-AAR03

The poster will present in vivo results showing that treatment with ibrexafungerp reduced the fungal burden in skin infected with Candida auris, when compared to the untreated control, thus suggesting efficacy in the treatment of cutaneous infections and the potential role of ibrexafungerp in C. auris skin decolonization.

Title: Efficacy of Oral Ibrexafungerp (Formerly SCY-078) in the Treatment of Candida auris Infection in a Murine Model 
Presenter: Mahmoud Ghannoum, PhD
Date and Time: Sunday, June 23, 11:00 am - 1:00 pm
Poster Presentation #: AAR-633
Session: P583-AAR03

In this study, data will be presented showing the potent antifungal activity of ibrexafungerp against C. auris strains in a murine mouse model measuring kidney fungal burden and survival rates. Tissue burdens were lower than vehicle controls in all treatment groups, with the highest reduction in tissue burden observed in the 30 mg/kg dosing group. The 14-day survival rate was comparable across groups, with animals in the 10, 20 and 30 mg/kg groups having survival rates of 60, 70 and 60%, respectively, compared to the vehicle group which had a survival rate of 20%.

Title: Preclinical Safety Evaluation of the Novel Antifungal Ibrexafungerp (formerly SCY-078) Supports Long-Term Dosing 
Presenter: Stephen Barat, PhD
Date and Time: Sunday, June 23, 11:00 am - 1:00 pm
Poster Presentation #: AAR-635
Session: P583-AAR03

Results from in vivo studies evaluating the safety of ibrexafungerp will be presented. In these ibrexafungerp studies, genetic toxicity, end organ toxicity from chronic daily dosing (in rats up to 6 months and in dogs up to 9 months) and developmental and reproductive toxicity in rats and/or rabbits from conception to sexual development of the offspring were evaluated. Ibrexafungerp was well-tolerated in both rats and dogs, with end organ toxicity consisting mainly of phospholipidosis. The no-observed-adverse-effect-levels (NOAELs) for end organ toxicity are equivalent to 7-fold and 3-fold multiples (in rats and dogs, respectively) relative to the targeted efficacious human clinical exposures based on data from in vivo murine models of candidiasis and aspergillosis. Results from this preclinical package suggest that ibrexafungerp has a favorable preclinical safety profile and supports the potential for long-term dosing in patients suffering from invasive fungal infections.

Title: Penetration of Ibrexafungerp (formerly SCY-078) versus Micafungin at the Site of Infection in an Intra-Abdominal Candidiasis Mouse Model 
Presenter: Annie Lee, PhD
Date and Time: Friday, June 21, 11:00 am - 12:00 pm and 4:00 pm – 5:00 pm
Poster Presentation #: AAR-696
Session: P436-AAR03

The poster will feature results from a study designed to test ibrexafungerp's penetration in a mouse model of intra-abdominal candidiasis (IAC), a common invasive fungal infection with high mortality. Echinocandins, the current standard of care for the treatment of invasive candidiasis, are not ideal treatment options for IAC given their poor penetration into intra-abdominal tissue and abscesses. In this study, ibrexafungerp penetrated significantly better into intra-abdominal abscesses as compared to micafungin. These data demonstrate that ibrexafungerp holds promise as a potential therapeutic option for IAC patients.

Title: Activity of a Novel 1,3-beta-D-Glucan Inhibitor, Ibrexafungerp (Formerly SCY-078), against Candida glabrata 
Presenter: Mahmoud Ghannoum, PhD
Date and Time: Sunday, June 23, 11:00 am - 1:00 pm
Poster Presentation #: AAR-634
Session: P583-AAR03

This study tested the in vitro activity of ibrexafungerp against C. glabrata clinical isolates (18 wild-type and 22 echinocandin-resistant strains), as well as the in vivo activity against wild-type and echinocandin-resistant C. glabrata strains. The ibrexafungerp MIC range against 40 C. glabrata clinical isolates was 0.5-4.0 µg/mL, with an MIC90 of 1.0 µg/mL. Time-kill studies showed that ibrexafungerp, at concentrations of 0.25 to 1 µg/mL, produced a 4 to 6 log reduction in growth of the susceptible strain at 24- and 48-hour time points. Mice infected with C. glabrata and treated with ibrexafungerp at doses ≤ 30 mg/kg showed significant reductions in kidney fungal burden for both a susceptible strain (P=≤ 0.01) and a echinocandin-resistant strain (P=≤0.03). In vivo and in vitro assays suggest that ibrexafungerp has promise for the treatment of invasive candidiasis caused by wild-type and echinocandin-resistant C. glabrata.

Title: Efficacy of Ibrexafungerp (Formerly SCY-078) in a Murine Therapeutic Model of Pneumocystis Pneumonia 
Presenter: Stephen Barat, PhD
Date and Time: Sunday, June 23, 11:00 am - 1:00 pm
Poster Presentation #: AAR-636
Session: P583-AAR03

This poster will highlight results from an in vivo study designed to evaluate the therapeutic activity of oral ibrexafungerp against Pneumocystis pneumonia (PCP), a significant risk for immunocompromised patients. Oral ibrexafungerp was evaluated at two dose levels (15mg/kg or 30mg/kg, twice daily), compared to trimethoprim/sulfamethoxazole (50/250mg/kg three times weekly), the current standard of care, and vehicle control. At each dose level, oral ibrexafungerp demonstrated activity against Pneumocystis, as determined by a reduction in organism burden and improved survival, supporting future clinical studies of ibrexafungerp for both treatment of PCP and prophylactic use as a single oral agent in immunocompromised patients.

Title: Interim Analysis of a Phase 3 Open-Label Study to Evaluate the Efficacy and Safety of Oral Ibrexafungerp (Formerly SCY-078) in Patients with Refractory or Intolerant Fungal Diseases (FURI) 
Presenter: Luis Ostrosky-Zeichner, MD
Date and Time: Sunday, June 23, 11:00 am- 1:00 pm
Poster Presentation #: CIV-166
Session: P550-CIV01

This poster will present results from the first interim analysis of 20 patients with various Candida infections from the FURI study, an open-label trial of oral ibrexafungerp in patients with refractory fungal infections. In this analysis, 11 patients (55%) achieved complete or partial response, six patients (30%) maintained stable disease, two patients (10%) experienced progression of disease and one case was considered indeterminate. Of particular interest, the patients enrolled in the FURI study predominantly had non-albicans Candida spp. infections, which are more resistant and difficult to treat with current marketed antifungal agents, reflecting the need for new antifungal therapies.

The ASM Microbe 2019 presentations will be available on the SCYNEXIS website following the event.