monomethyl-auristatin-e and Carcinoma--Transitional-Cell

Topics: Animals; Antibodies, Monoclonal; Antineoplastic Combined Chemotherapy Protocols; Carcinoma, Transitional Cell; Cell Adhesion Molecules; Humans; Immunoconjugates; Immunotherapy; Neoplasm Metastasis; Oligopeptides; Prognosis; Urologic Neoplasms

Human epidermal growth factor receptor 2 (HER2) is a protein that is overexpressed in some types of cancer, including breast and urothelial cancer. Here we found that HER2 was present in a portion of colon cancer patients, raising the possibility of using anti-HER2 therapy. RC48, a novel antibody-drug conjugate (ADC) comprising cytotoxic monomethyl auristatin E (MMAE) and an anti-HER2 antibody tethered via a linker, showed a comparable therapeutic effect in both HER2 low expressed (IHC2+/FISH- or IHC+) and high expressed urothelial cancer patients. In vitro studies using colon cancer cell lines showed that RC48 effectively impeded the proliferation of HER2-positive cells, indicating its potential as a treatment for HER2-positive colon cancer. Mechanism study showed that RC48 not only induces cell cycle arrest but also disrupts HER2-mediated restain of cGAS-STING signaling, potentially activating an immune response against the cancer cells. The administration of RC48 significantly reduced the growth of HER2-positive colon cancer and made HER2-positive colon cancer cells more susceptible to immunotherapy. The results of our study will contribute to determining the feasibility of RC48 as a therapeutic option for HER2-positive colon cancer.

Topics: Antibodies; Carcinoma, Transitional Cell; Colonic Neoplasms; Humans; Immunotherapy; Oligopeptides; Urinary Bladder Neoplasms