PT - JOURNAL ARTICLE AU - YUAN-CHIANG CHUNG AU - YUNG-LUNG KU AU - HUA-CHE CHIANG AU - WEI-CHUN LIU AU - TING-YU KAO AU - CHIEN-HUI YANG AU - CHIU-CHEN HUANG AU - CHIH-PING HSU TI - Antibody to Interleukin-6 Receptor Inhibits <em>In Vivo</em> Growth of Human Colorectal Carcinoma Cell Xenografts AID - 10.21873/anticanres.15304 DP - 2021 Oct 01 TA - Anticancer Research PG - 4907--4916 VI - 41 IP - 10 4099 - http://ar.iiarjournals.org/content/41/10/4907.short 4100 - http://ar.iiarjournals.org/content/41/10/4907.full SO - Anticancer Res2021 Oct 01; 41 AB - Background: Interleukin-6 receptor antibody (IL6R) inhibits colony formation and invasion by colorectal carcinoma (CRC) in vitro. We examined the effect of IL6R antibody on tumor growth of CRC xenografts in vivo. Materials and Methods: SW480 cells inoculated subcutaneously into NU/NU mice were treated with anti-IL6R and tumor histology and growth-related signaling were subsequently estimated by hematoxylin and eosin and immunohistochemical staining. Results: Tumor growth was inhibited by anti-IL6R treatment at dosages of both 0.1 and 1.0 mg/kg. Tumor cells had invaded into surrounding tissues in untreated mice, while there was no invasion of tumors in the IL6R antibody-treated mice. The expression of Ki-67, signal transducer and activator of transcription protein 3 (STAT3) and phosphor-extracellular signal-regulated kinase 1 and 2 (ERK1/2) were suppressed in anti-IL6R-treated tumors. Conclusion: IL6R antibody inhibited tumor growth and invasiveness in vivo by suppressing the expression of Ki-67, STAT3 and phosphor-ERK1/2. The results imply that the anti-IL6R may be a promising targeted drug for CRC.