BIOMARKERS FOR CD47 BLOCKADE THERAPY
Subjects responsive to a CD47 blocking agent, such as SIRPαFc, exhibit an elevated level of expression of one or more markers. Accordingly, subjects with elevated levels of the markers are treated with CD47 blocking agents while subject that are not responsive and 5 do not have elevated levels of markers are not selected for treatment. The markers are selected from CHIT1, SPP1, FCγR3A and FCγR2A.
1 . A method for treating a subject presenting with a CD47+ cancer, comprising administering a CD47 blocking agent to a subject determined to respond to the blocking agent with an elevated level of expression of a marker gene selected from SPP1, CHIT1, FCγR2A and FCγR3A.
2 . (canceled)
3 . A method of predicting responsiveness to therapy with a CD47 blocking agent of a cancer in a subject, the method comprising determining the expression level of one, two or all of the marker genes CHIT1, FCγR2A, FCγR3A and SPP1 in a sample of that cancer obtained from that subject relative to a control or normal level thereof, whereby elevated marker gene expression in a sample from a subject treated with the CD47 blocking agent predicts the cancer is responsive to therapy with that CD47 blocking agent.
4 . The method according to claim 1 , wherein the cancer is a blood cancer.
5 . The method according to claim 1 , wherein the cancer is a leukemia.
6 . The method according to claim 1 , wherein the cancer is a lymphoma.
7 . The method according to claim 1 , wherein the cancer is a myeloma.
8 . The method according to claim 4 , wherein the cancer is selected from the group consisting of Hodgkin's lymphoma, indolent and aggressive non-Hodgkin's lymphoma, Burkitt's lymphoma, follicular lymphoma, T cell lymphoma, mycosis fungoides, Sezary Syndrome, cutaneous T cell lymphoma (CTCL), promyelocytic leukemia, chronic and acute myeloid leukemia, acute and chronic lymphoid leukemia, multiple myeloma (MM), giant cell myeloma, heavy-chain myeloma, and light chain or Bence-Jones myeloma, diffuse large B-cell lymphoma (DLCBL), and T-cell acute lymphoblastic leukemia.
9 . The method according to claim 1 , wherein the CD47 blocking agent is SIRPαFc having an IgG1-based Fc region.
10 . The method according to claim 1 , wherein the CD47 blocking agent is SIRPαFc having an IgG4-based Fc region.
11 . The method according to claim 1 , wherein the marker comprises an elevated level of FCγR3A expression or of FCγR2A expression.
12 . The method according to claim 1 , wherein the marker comprises an elevated level of SPP1 expression.
13 . The method according to claim 1 , wherein the marker comprises an elevated level of CHIT1 expression.
14 . The method according to claim 1 , wherein the cancer is a solid tumour.
15 . The method according to claim 1 wherein the cancer is an ovarian cancer.
16 . The method according to claim 1 wherein the marker is a gene selected from CHIT1, FCγR2A, and FCγR3A, or an expression product thereof.
17 . The method according to claim 16 , wherein the marker is a gene selected from FCγR2A and FCγR3A, or an expression product thereof.
18 . A kit useful to identify a cancer cell that will respond to treatment with a CD47 blocking agent, the kit comprising:
(a) means useful in determining the expression level of a marker gene selected from one or more of CHIT1, FCγR2A, FCγR3A, and SPP1; and
(b) instructions for the use thereof in determining that level, thereby to identify a candidate for therapy with that CD47 blocking agent.