ERBB2 and breast cancer: Moreover, this is in agreement with other studies which used various types of microscopies (polarised, SHG, two‐photon, multiphoton and atomic force microscopy (AFM)) to compare the collagen architecture in different molecular subtypes which showed that highly aggressive BC subtypes (including TNBC, HER2 positive and luminal B) had higher collagen density, thicker and straighter compared to less aggressive subtypes38, 39 which is consistent with our results.