A Study to Evaluate the Safety and Efficacy of CR845 in Hemodialysis Patients With Moderate-to-Severe Pruritus (KALM-1)

Key Inclusion Criteria: To be eligible for inclusion into the Double-blind Phase of the study, a patient must meetthe following criteria:

• Has end-stage renal disease (ESRD) and has been on hemodialysis 3 times per week forat least 3 months prior to the start of screening;
• Has at least 2 single-pool Kt/V measurements ≥1.2, or at least 2 urea reduction ratiomeasurements ≥65%, or 1 single pool Kt/V measurement ≥1.2 and 1 urea reduction ratiomeasurement ≥65% on different dialysis days during the 3 months period prior toscreening;
• Prior to randomization:
• Has completed Worst Itching Intensity NRS worksheets up to 8 days prior to 1stdose;
• Has a mean baseline Worst Itching Intensity NRS indicative of moderate to severeuremic pruritus.
• To be eligible for inclusion into the Open-label Extension Phase of the study, eachpatient will have to fulfill the additional key following criteria at the time ofentry into the Open-label Extension Phase:
• Has received at least 30 doses of the planned 36 doses of study drug during theDouble-blind Phase of this study;
• Continues to meet inclusion criteria.

Key Exclusion Criteria: A patient will be excluded from the Double-blind Phase of the study if any of the followingcriteria are met:

• Known noncompliance with dialysis treatment that in the opinion of the investigatorwould impede completion or validity of the study;
• Scheduled to receive a kidney transplant during the study;
• New or change of treatment received for itch including antihistamines andcorticosteroids (oral, IV, or topical) within 14 days prior to screening;
• Received another investigational drug within 30 days prior to the start of screeningor is planning to participate in another clinical study while enrolled in this study;
• Has pruritus only during the dialysis session (by patient report);
• Is receiving ongoing ultraviolet B and anticipates receiving such treatment during thestudy;
• Participated in a previous clinical study with CR845.
• A patient will be excluded from the Open-label Extension Phase of the study if any ofthe additional key following criteria are met at the time of entry into the Open-labelExtension Phase:
• Completed the Double-blind Phase of this study but exhibited adverse eventsduring the course of the Treatment Period that may preclude continued exposure tothe study drug;
• Was noncompliant with protocol procedures during the Double-blind Phase of thisstudy which is indicative of an inability to follow protocol procedures.