Duloxetine does not alter uptake and antitumor properties of oxaliplatin. A, Influence of duloxetine (1 or 10 μmol/L) on the intracellular accumulation of oxaliplatin in colorectal cancer cell lines in vitro. Influence of duloxetine pretreatment on oxaliplatin-related body weight loss (B), tumor volume of xenografted luciferase-expressing HCT116 cells (C), OIPN as measured by VFH test (D), levels of total platinum in tumor samples (E), and DRG neurons (F) after completion of a 3-week treatment regimen. Bars and symbols represent mean ± SD. Details of the treatment and analysis are described in the Materials and Methods section (n = 7–9). *, P < 0.05 versus vehicle control (C), versus oxaliplatin alone (D, F). NS, not statistically significant.