Abstract: The present invention relates to a method for the prognosis of the progression of a solid tumour in a patient, which includes at least the following steps: a) making, from a tumour sample, a virtual slide on which a tumour front can be identified; b) quantifying, on said virtual slide made in step a), the density of cells and/or blood vessels present in a continuous area covering the tumour front and extending on either side of the tumour front over a distance of at least 0.5 mm, referred to as the quantification area; and c) deducing, from said quantification, the risks of postoperative relapse and/or the sensitivity to various antitumor treatments and/or the risks of developing metastases in said patient. Preferably, the cells to be quantified are leukocytes, such as T cells, B cells, macrophages, natural killer cells, dendritic cells, or subpopulations of these immune system cells.