Prognostic and/or predictive biomarkers and biological applications thereof

An in vitro method of assessing or monitoring the sensitivity of a subject having a tumor to a chemotherapy, which method comprises a step of determining, in a biological sample of said subject, the absence, presence or expression level of the expression product of at least one gene selected from the genes identified in Table I, in at least one gene selected from the genes identified in Table 1, thereby assessing or monitoring whether the subject having a tumor is responsive or resistant to the chemotherapy.

A method of selecting an appropriate treatment of a cancer for a subject having a tumor, which method comprises a step of determining the presence or absence of LIPC in a biological sample of said subject, the absence of LIPC in the biological sample being the indication that a chemotherapy will be efficient in the subject, the presence of LIPC in the biological sample being the indication that a chemotherapy will be detrimental to the subject.

A method of assessing the prognosis of a cancer in a subject, the method comprising a step of determining, in a biological sample of said subject, the absence, presence or expression level of a compound selected from vitamin B6, pyridoxal (PL), pyridoxal-5-phosphate (PLP), pyridoxamine (PM), pyridoxamine-5′-phosphate, pyridoxine (PN), pyridoxine-5′-phosphate, L-2-aminoadipate and L-2-aminoadipate 6-semialdehyde, and/or of the expression product of at least one gene selected from the genes identified in Table I, or a derivative product thereof, thereby assessing the prognosis of the cancer in the subject.

A method of selecting an appropriate treatment of a cancer for a subject having a tumor, which method comprises a step of determining the expression level of a compound selected from PDXK, PDXP or aldehyde dehydrogenase 7 family, member A1 (ALDH7A1) in a biological sample of said subject, the non-expression thereof or a reduced expression thereof, when compared to a reference expression level, being the indication that a compound selected from vitamin B6, pyridoxal (PL), pyridoxal-5-phosphate (PLP), pyridoxamine (PM), pyridoxamine-5′-phosphate, pyridoxine (PN), or pyridoxine-5′-phosphate (PNP), should be administered to the patient alone or together with a conventional treatment of cancer.

A method of selecting an appropriate treatment of a cancer for a subject having a tumor, which method comprises a step of determining the presence, absence or expression level of LIPC in a biological sample of said subject, the presence of LIPC in the biological sample, or an overexpression thereof when compared to a reference expression level, being the indication that Orlistat should be administered to the patient together with a conventional treatment of cancer.

A kit for assessing or monitoring the sensitivity of a subject having a tumor to a chemotherapy, or the prognosis of a cancer in a subject, wherein the kit comprises detection means selected from the group consisting of a pair of primers, a probe, at least one antibody specific to the expression product of a gene selected from the genes identified in Table I or to a derivative product thereof, and a DNA chip, and, optionally, a leaflet providing the wild-type sequence of the gene and/or the control quantitative expression value corresponding to the expression product of the gene in a control population and/or corresponding to a derivative product thereof.

A DNA chip comprising a solid support which carries nucleic acids that are specific to at least two genes selected from the genes identified in Table I.

A method for screening or identifying a compound suitable for improving the treatment of a cancer in a subject having a tumor, said method comprising determining the ability of a test compound to modify the expression of at least one gene selected from the genes identified in Table I, or compensate an abnormal expression thereof.