CytomX - Model CX-2029 - CD71-Directed Probody Drug Conjugate

CytomX and AbbVie are co-developing CX-2029, a PDC directed against CD71, the transferrin receptor that is highly expressed on a number of solid and hematologic tumors, as well as many normal tissues. CytomX is evaluating CX-2029 in a Phase 1/2 clinical trial as monotherapy. CD71 is an excellent “internalizer,” which has the potential to efficiently deliver toxin to tumor cells. Historically, CD71 has not been widely pursued as a target given its expression on normal tissues and potential for causing toxicities. CytomX presented initial Phase 1 data at ASCO 2020 validating CD71 as a first-in-class oncology target with encouraging clinical activity observed. CytomX is preparing to advance the CX-2029 into 4 dose-expansion cohorts in patients with head and neck cancer, squamous non-small cell lung cancer, esophageal carcinoma, and diffuse large B cell lymphoma.