CytomX Therapeutics, Inc. announced that it has received clearance from the U.S. Food and Drug Administration (FDA) for its Investigational New Drug (IND) applications for the conditionally activated Probody therapeutics CX-2051, an EpCAM-directed ADC, and CX-801, a dual-masked version of interferon-alpha 2b. CX-2051 has been cleared for the initiation of Phase 1 dose escalation in solid tumors with known EpCAM expression and CX-801 has been cleared for the initiation the initiation of Phase 1 dose expansion in solid tumors including melanoma, renal, and head and neck squamous cell carcinoma. Both programs are expected to start Phase 1 studies in the first half of 2024.