| CPC C07K 16/2851 (2013.01) [A61K 31/436 (2013.01); A61K 31/711 (2013.01); A61K 35/28 (2013.01); A61K 38/1774 (2013.01); A61K 38/1793 (2013.01); A61K 39/39558 (2013.01); A61K 40/11 (2025.01); A61K 40/31 (2025.01); A61K 40/421 (2025.01); A61K 40/4217 (2025.01); A61K 45/06 (2013.01); A61K 48/00 (2013.01); C07K 14/7051 (2013.01); C07K 14/70517 (2013.01); C07K 14/7056 (2013.01); C07K 14/70578 (2013.01); C07K 14/7151 (2013.01); C07K 16/2803 (2013.01); C07K 16/30 (2013.01); C07K 16/3061 (2013.01); A61K 38/00 (2013.01); A61K 2039/505 (2013.01); A61K 2239/31 (2023.05); A61K 2239/38 (2023.05); A61K 2239/48 (2023.05); C07K 2317/21 (2013.01); C07K 2317/24 (2013.01); C07K 2317/33 (2013.01); C07K 2317/53 (2013.01); C07K 2317/565 (2013.01); C07K 2317/622 (2013.01); C07K 2317/73 (2013.01); C07K 2319/00 (2013.01); C07K 2319/03 (2013.01); C07K 2319/33 (2013.01); C07K 2319/70 (2013.01)] | 24 Claims |

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1. A method of inducing an immune response in a mammal, comprising administering to the mammal an effective amount of a population of immune effector cells comprising a chimeric antigen receptor (CAR) polypeptide, wherein the CAR polypeptide comprises a CD33 binding domain, a transmembrane domain, and an intracellular signaling domain, wherein the intracellular domain comprises a costimulatory domain, a primary signaling domain, or both a costimulatory domain and a primary signaling domain, and wherein said CD33 binding domain comprises a heavy chain variable region and a light chain variable region selected from the group consisting of:
(i) a heavy chain variable region comprising:
a heavy chain complementary determining region 1 (HC CDR1) comprising the sequence of SEQ ID NO: 274, a heavy chain complementary determining region 2 (HC CDR2) comprising the sequence of SEQ ID NO: 283, and a heavy chain complementary determining region 3 (HC CDR3) comprising the sequence of SEQ ID NO:292 present in order of HC CDR1, HC CDR2, and HC CDR3; and
a light chain variable region comprising:
a light chain complementarity determining region 1 (LC CDR1) comprising the sequence of SEQ ID NO: 301, a light chain complementarity determining region 2 (LC CDR2) comprising the sequence of SEQ ID NO: 310, and a light chain complementarity determining region 3 (LC CDR3) comprising the sequence of SEQ ID NO:319 present in order of LC CDR1, LC CDR2, and LC CDR3;
(ii) a heavy chain variable region comprising:
a heavy chain complementarity determining region 1 (HC CDR1) comprising the sequence of SEQ ID NO: 328, a heavy chain complementarity determining region 2 (HC CDR2) comprising the sequence of SEQ ID NO: 337, and a heavy chain complementarity determining region 3 (HC CDR3) comprising the sequence of SEQ ID NO:346 present in order of HC CDR1, HC CDR2, and HC CDR3; and
a light chain variable region comprising:
a light chain complementarity determining region 1 (LC CDR1) comprising the sequence of SEQ ID NO: 355, a light chain complementarity determining region 2 (LC CDR2) comprising the sequence of SEQ ID NO: 364, and a light chain complementarity determining region 3 (LC CDR3) comprising the sequence of SEQ ID NO:373 present in order of LC CDR1, LC CDR2, and LC CDR3; and
(iii) a heavy chain variable region comprising:
a heavy chain complementarity determining region 1 (HC CDR1) comprising the sequence of SEQ ID NO: 89, a heavy chain complementarity determining region 2 (HC CDR2) comprising the sequence of SEQ ID NO: 98, and a heavy chain complementarity determining region 3 (HC CDR3) comprising the sequence of SEQ ID NO: 107, present in order of HC CDR1, HC CDR2, and HC CDR3; and
a light chain variable region comprising:
a light chain complementarity determining region 1 (LC CDR1) comprising the sequence of SEQ ID NO: 116, a light chain complementarity determining region 2 (LC CDR2) comprising the sequence of SEQ ID NO: 125, and a light chain complementarity determining region 3 (LC CDR3) comprising the sequence of SEQ ID NO: 134 present in order of LC CDR1, LC CDR2, and LC CDR3.
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