MONITORING IMMUNE RESPONSIVENESS TO CANCER VACCINATION
The invention is direct to a method for determining a cancer patient's immune responsiveness to anti-cancer vaccination. In one aspect, for each of a plurality of vaccinations, pairs of clonotype profiles are obtained, one immediately prior to vaccination and one during the period of peak immune response, usually within two to twenty days after the vaccination. Responsiveness is correlated to successive increases in identical clonotypes within each pair of clonotype profiles in at least two successive vaccinations.
1 . A method of measuring immune responsiveness of a patient to a cancer vaccine, the method comprising the steps of:
generating a pair of clonotype profiles at each of a plurality of successive vaccinations of a patient with a cancer vaccine, wherein a first clonotype profile of each pair is from a sample from the patient prior to vaccination and a second clonotype profile of each pair is from a sample from the patient after vaccination at a time within a peak immune response to vaccination, each clonotype profile comprising at least 1000 sequence reads of at least 30 nucleotides; and
correlating immune responsiveness of the patient to the cancer vaccine with an increase of identical clonotypes within each pair of clonotype profiles of at least two successive vaccinations.
2 . The method of claim 1 wherein said sample is a peripheral blood sample or a tumor sample.
3 . The method of claim 1 wherein said peak immune response is in a period from two to twenty days, inclusive, after said vaccination.
4 . The method of claim 1 wherein said step of correlating includes correlating said immune responsiveness with an increase of identical clonotypes within each pair of clonotype profiles of at least three successive vaccinations.
5 . The method of claim 1 wherein said identical clonotypes encode immunoglobulins and/or T cell receptors specific for antigens of the cancer vaccine.
6 . The method of claim 1 wherein a number and frequency of said identical clonotypes increase between said successive vaccinations.