COL6A1 and neoplasm: Analysis of common ECM markers and stromal cell types showed no significant differences between the EV and Col6a1.03 conditions, although there was a trend for a 1.5–2-fold increase in abundance of fibroblasts (αSMA+), neutrophils (Ly6G+) and macrophages (F4/80+) in collagen VI KO tumours.