- Measurable disease at Screening, defined as at least one of the following M component in serum (greater than or equal to 0.5 g/dL) and/or urine (greater than or equal to 0.2 g excreted in a 24 hour collection sample) or serum free light chain greater than or equal to 100 mg/dL with an abnormal κ/λ ratio of less than 0.26 or greater than 1.65.