To investigate if LaNt α31 expression is linked to proliferation, we used inhibited cell division using mitomycin c in two widely used cell lines derived from malignant ductal carcinomas, MCF7 and MDA-MB-231, then quantified LAMA3LN1 transcript abundance using RT-qPCR normalised to GAPDH and RPLP0. The gene discussed is GAPDH; the disease is breast ductal adenocarcinoma.