The foetal and placental ratios of the control, tumour-bearing and ascitic fluid-injected groups. The foetal weight and corresponding placental weight were plotted and the positive correlation between these parameters was analysed using GraphPad Prism software. There was a significant difference (*P < 0.05) between the tumour-bearing and ascitic fluid-injected groups compared to the control rats. Groups: C – control rats, W – tumour-bearing rats and A – rats injected with ascitic fluid. The rats in each group were sacrificed on the 16th, 19th and 21st day of pregnancy.