Gene Expression Profiles of 4 CRC PDX models treated by RSPO3 antagonist.

RSPO is a WNT pathway activator and functions as a potent regulator of stem cell growth in colon. RSPO family members were produced by several human tumors representing multiple tumor types including ovarian, pancreatic, colon, breast and lung cancer. Specific monoclonal antibody antagonists of RSPO family members were developed. In human patient-derived tumor xenograft models, anti-RSPO treatment markedly inhibited tumor growth either as single agents or in combination with chemotherapy. Furthermore, blockade of RSPO signaling reduced the tumorigenicity of cancer cells based on serial transplantation studies.

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Chartier C, Raval J, Axelrod F, Bond C, Cain J, Dee-Hoskins C, Ma S, Fischer MM, Shah J, Wei J, Ji M, Lam A, Stroud M, Yen WC, Yeung P, Cancilla B, O'Young G, Wang M, Kapoun AM, Lewicki J, Hoey T, Gurney A