Abstract: A method for predicting the sensitivity of tumor cells to an anthracycline-based chemotherapy includes determining the differential expression level of a MYBL2 gene in tumors cells. A polynucleotide library is useful to predict the sensitivity of tumor cells to an anthracycline-based chemotherapy and includes a pool of polynucleotide sequences or subsequences thereof wherein the sequences or subsequences correspond substantially to any of the polynucleotide sequences SEQ ID No: 308, SEQ ID No: 309 and/or SEQ ID No: 310 or the complements thereof.

Abstract: Method for molecular characterization of a carcinoma including: (i) detecting in tumor cells corresponding to breast tumor cells at least one polynucleotide selected from a first group determining expression level of the polynucleotide from the first group to differentiate a tumor in which a lymph node has been invaded by a tumor cell from a tumor in which a lymph node has not been invaded by a tumor cell; (ii) detecting in tumor cells corresponding to breast tumor cells at least one polynucleotide selected from a second group determining expression level of the polynucleotide from the second group to distinguish tumors sensitive to anthracycline from tumors insensitive to anthracycline; (iii) detecting in tumor cells corresponding to breast tumor cells at least one polynucleotide selected from a third group determining expression levels of the polynucleotide from the third group to classify good and poor prognosis primary breast tumors.