HTR1E inhibits the growth and peritoneal dissemination of OC xenografts in mice. (A) qRT-PCR and western blot showing the knockdown efficiencies of shRNAs targeting HTR1E (shHTR1E) (means ± SEM from three independent experiments, ***P < 0.001, by unpaired, two-tailed student's t-test). The shRNA targeting bacteria lacZ is used as a negative control (shCtrl). (B) qRT-PCR and western blot analysis of HTR1E in indicated OC cell lines (means ± SEM from three independent experiments, **P < 0.01, ***P < 0.001, by unpaired, two-tailed student's t-test). (C) Images of OC xenografts dissected from NSG mice orthotopically inoculated with indicated SK-OV-3 cells 42 days ago and the weights of the xenografts (n = 5 for each group, ***P < 0.001, by unpaired, two-tailed student's t-test). (D) Representative images of the abdominal parts of mice (left). The primary tumors and the metastatic nodules are indicated by blue and red arrows, respectively. The volumes of ascites in the peritoneal cavities were measured (right, n = 5 for each group, *P < 0.05, by unpaired, two-tailed student's t-test). (E) H&E staining of the primary OC xenografts and the metastatic nodules on the intestine. (F) Representative images of peritoneal metastatic nodules on the intestines (left) and the quantification (right, n = 5 for each group, *P < 0.05, by unpaired, two-tailed student's t-test).