Method and system for determining whether a drug will be effective on a patient with a disease
A process of determining whether a patient with a disease or disorder will be responsive to a drug, used to treat the disease or disorder, including obtaining a test spectrum produced by a mass spectrometer from a serum produced from the patient. The test spectrum may be processed to determine a relation to a group of class labeled spectra produced from respective serum from other patients having the or similar clinical stage same disease or disorder and known to have responded or not responded to the drug. Based on the relation of the test spectrum to the group of class labeled spectra, a determination may be made as to whether the patient will be responsive to the drug.
1. A method of analyzing a mass spectrum, comprising the steps of:
a) obtaining a mass spectrum of a blood-based sample from a human patient;
b) subtracting background contained in the mass spectrum to produce a background subtracted spectrum, wherein the subtracting step comprises (i) estimating, in a moving window comprising a range of m/z values in said mass spectrum using robust asymmetric estimates, nonconstant levels of background and (ii) subtracting the estimated background from the mass spectrum;
c) normalizing the background subtracted spectrum;
d) aligning the normalized, background subtracted spectrum to a predefined mass scale, the predefined mass scale associated with common peaks or peak clusters identified from a group of other mass spectra from other blood-based samples; and
e) classifying the mass spectrum using a training set comprising class-labeled mass spectra of blood-based samples of other human patients;
wherein the aligning step d) further comprises the step of aligning the normalized, background subtracted spectrum to a list of peak clusters identified from a group of mass spectra from blood-based samples which are both close in m/z position and well separated from each other in the m/z axis;
wherein the list of peak clusters are characterized by a center (m/z position) and a width (m/z range), and wherein one or more of the following m/z positions are within the list of peak clusters: 6434.50, 6632.18, 11686.94, 15131.14, 15871.47 and 28102.55.
2. A method of analyzing a mass spectrum, comprising the steps of:
a) obtaining a mass spectrum of a blood-based sample from a human patient;
b) subtracting background contained in the mass spectrum to produce a background subtracted spectrum, wherein the subtracting step comprises (i) estimating, in a moving window comprising a range of m/z values in said mass spectrum using robust asymmetric estimates, nonconstant levels of background and (ii) subtracting the estimated background from the mass spectrum;
c) normalizing the background subtracted spectrum;
d) aligning the normalized, background subtracted spectrum to a predefined mass scale, the predefined mass scale associated with common peaks or peak clusters identified from a group of other mass spectra from other blood-based samples; and
e) classifying the mass spectrum using a training set comprising class-labeled mass spectra of blood-based samples of other human patients;
wherein the aligning step d) further comprises the step of aligning the normalized, background subtracted spectrum to a list of peak clusters identified from a group of mass spectra from blood-based samples which are both close in m/z position and well separated from each other in the m/z axis;
wherein step d) further comprises the step of aligning the normalized, background subtracted spectrum to peak clusters centered at the following m/z positions: 6434.50, 6632.18, 11686.94, 15131.14, 15871.47 and 28102.55.