ANTIBODY CONSTRUCTS BINDING 4-1BB AND TUMOR-ASSOCIATED ANTIGENS AND USES THEREOF

1 . An antibody construct comprising:

a) a first 4-1BB antigen-binding domain that binds to a 4-1BB extracellular domain (4-1BB ECD) and is derived from an agonistic anti-4-1BB antibody, and

b) a first tumor-associated antigen (TAA) antigen binding domain (TAA antigen-binding domain) that binds to a TAA,

wherein the first 4-1BB antigen-binding domain and the first TAA antigen-binding domain are linked directly or indirectly to a scaffold.

2 .- 4 .(canceled)

5 . The antibody construct according to claim 1 , wherein the first 4-1BB antigen-binding domain comprises: a) a heavy chain variable domain comprising the three heavy chain CDRs of antibody 1C3, and a light chain variable domain comprising the three light chain CDRs of antibody 1C3; b) a heavy chain variable domain comprising the three heavy chain CDRs of antibody 1C8, and a light chain variable domain comprising the three light chain CDRs of antibody 1C8; c) a heavy chain variable domain comprising the three heavy chain CDRs of antibody 1G1, and a light chain variable domain comprising the three light chain CDRs of antibody 1G1; d) a heavy chain variable domain comprising the three heavy chain CDRs of antibody 2E8, and a light chain variable domain comprising the three light chain CDRs of antibody 2E8; e) a heavy chain variable domain comprising the three heavy chain CDRs of antibody 3E7, and a light chain variable domain comprising the three light chain CDRs of antibody 3E7; and f) a heavy chain variable domain comprising the three heavy chain CDRs of antibody 4E6, and a light chain variable domain comprising the three light chain CDRs of antibody 4E6; g) a heavy chain variable domain comprising the three heavy chain CDRs of antibody 5G8, and a light chain variable domain comprising the three light chain CDRs of antibody 5G8; or h) a heavy chain variable domain comprising the three heavy chain CDRs of antibody 6B3, and a light chain variable domain comprising the three light chain CDRs of antibody 6B3.

6 . The antibody construct according to claim 5 , wherein the first 4-1BB antigen-binding domain is a human or humanized antigen-binding domain.

7 . The antibody construct according to claim 6 , wherein the first 4-1BB antigen-binding domain comprises:

a) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28726 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28726;

b) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28727 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28727;

c) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28728 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28728;

d) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28730 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28730;

e) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28700 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28700;

f) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28704 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28704;

g) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28705 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28705;

h) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28706 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28706;

i) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28711 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28711;

j) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28712 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28712;

k) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28713 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28713;

l) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28696 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28696;

m) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28697 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28697;

n) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28698 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28698;

o) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28701 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28701;

p) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28702 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28702;

q) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28703 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28703;

r) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28707 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28707;

s) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28683 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28683;

t) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28684 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28684;

u) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28685 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28685;

v) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28686 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28686;

w) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28687 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28687;

x) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28688 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28688;

y) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28689 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28689;

z) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28690 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28690;

aa) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28691 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28691;

bb) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28692 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28692;

cc) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28694 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28694;

dd) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28695 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28695; or

ee) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28693 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28693.

8 . The antibody construct according to claim 7 , further comprising a second 4-1BB antigen binding domain.

9 . (canceled)

10 . The antibody construct according to claim 8 , wherein the second 4-1BB antigen-binding domain is the same as the first 4-1BB antigen-binding domain.

11 . The antibody construct according to claim 10 , wherein the first 4-1BB antigen-binding domain and/or the second 4-1BB antigen-binding domain are in a Fab format.

12 . The antibody construct according to claim 11 , wherein the first TAA antigen-binding domain is a folate receptor-α (FRα) antigen-binding domain, a Solute Carrier Family 34 Member 2 (NaPi2b) antigen-binding domain, a HER2 antigen-binding domain, a mesothelin antigen-binding domain, or a Solute Carrier Family 39 Member 6 (LIV-1) antigen-binding domain.

13 . The antibody construct according to claim 12 , wherein the antibody construct comprises a second TAA antigen-binding domain.

14 . The antibody construct according to claim 13 , wherein the first and second TAA antigen-binding domain bind to the same TAA.

15 . The antibody construct according to claim 12 , wherein the first TAA antigen-binding domain is a FRα antigen-binding domain.

16 . The antibody construct according to claim 15 , wherein the FRα antigen-binding domain comprises: a) a heavy chain variable domain comprising the three heavy chain CDRs of antibody 8K22, and a light chain variable domain comprising the three light chain CDRs of antibody 8K22; or b) heavy chain variable domain comprising the three heavy chain CDRs of antibody 1H06, and a light chain variable domain comprising the three light chain CDRs of antibody 1H06.

17 . The antibody construct according to claim 16 , wherein the FRα antigen-binding domain is a human or humanized antigen-binding domain.

18 . The antibody construct according to claim 17 , wherein the FRα antigen-binding domain comprises:

a) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23794 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23794;

b) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23795 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23795;

c) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23796 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23796;

d) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23797 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23797;

e) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23798 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23798;

f) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23799 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23799;

g) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23800 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23800;

h) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23801 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23801;

i) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23802 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23802;

j) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23803 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23803;

k) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23804 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23804;

l) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23805 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23805;

m) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23806 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23806;

n) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23807 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23807;

o) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23808 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23808;

p) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23809 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23809;

q) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23810 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23810;

r) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23811 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23811;

s) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23812 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23812;

t) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23813 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23813;

u) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23814 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23814;

v) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23815 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23815;

w) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23816 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23816;

x) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23817 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23817; or

y) a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23818 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23818.

19 . The antibody construct according to claim 12 , wherein the TAA antigen-binding domain is in an scFv format.

20 . The antibody construct according to claim 12 , wherein the TAA antigen-binding domain is in a Fab format.

21 . The antibody construct according to claim 12 , wherein the scaffold is a dimeric Fc construct having a first Fc polypeptide and a second Fc polypeptide, each Fc polypeptide comprising a CH3 sequence, or wherein the scaffold is a linker or an albumin polypeptide.

22 . The antibody construct according to claim 21 , wherein the scaffold is a heterodimeric Fc construct having a first Fc polypeptide that is different from the second Fc polypeptide, and wherein the CH3 sequences of the first Fc polypeptide and the second Fc polypeptide comprise amino acid substitutions that promote the formation of a heterodimeric Fc.

23 . The antibody construct according to claim 22 , wherein:

a) one Fc polypeptide comprises the amino acid substitutions T350V_L351Y_F405A_Y407V and the other Fc polypeptide comprises the amino acid substitutions T350V_T366L_K392L_T394W;

b) one Fc polypeptide comprises the amino acid substitutions T350V_T366L_K392M_T394W and the other Fc polypeptide comprises the amino acid substitutions T350V_L351Y_F405A_Y407V;

c) one Fc polypeptide comprises the amino acid substitutions L351Y_F405A_Y407V and the other Fc polypeptide comprises the amino acid substitutions T366L_K392M_T394W;

d) one Fc polypeptide comprises the amino acid substitutions L351Y_F405A_Y407V and the other Fc polypeptide comprises the amino acid substitutions T366L_K392L_T394W; or e) one Fc polypeptide comprises the amino acid substitutions L351Y_S400E_F405A_Y407V and the other Fc polypeptide comprises the amino acid substitutions T366I_N390R_K392M_T394W,

wherein the numbering of residues is according to the EU numbering system.

24 . The antibody construct according to claim 21 , further comprising one or more amino acid modifications that reduce effector function.

25 . (canceled)

26 . The antibody construct according to claim 1 , wherein the first 4-1BB antigen-binding domain is linked to the N terminus of the first Fc polypeptide, and the first TAA antigen-binding domain is linked to the C terminus of the first Fc polypeptide.

27 . The antibody construct according to claim 1 , wherein the first 4-1BB antigen-binding domain is linked to the N terminus of the first Fc polypeptide, and the first TAA antigen-binding domain is linked to the C terminus of the second Fc polypeptide

28 . The antibody construct according to claim 8 , wherein the first 4-1BB antigen-binding domain is linked to the N terminus of the first Fc polypeptide, and the first TAA antigen-binding domain is linked to the C terminus of the first Fc polypeptide, and the second 4-1BB antigen-binding domain is linked to the N terminus of the second Fc polypeptide.

29 . (canceled)

30 . The antibody construct according to claim 13 , wherein the first 4-1BB antigen-binding domain is linked to the N terminus of the first Fc polypeptide or to the N terminus of the second Fc polypeptide, the first TAA antigen-binding domain is linked to the C terminus of the first Fc polypeptide and a second TAA antigen-binding domain is linked to the C terminus of the second Fc polypeptide.

31 . The antibody construct according to claim 15 , wherein the first and second 4-1BB antigen-binding domains comprise a heavy chain variable domain comprising the three heavy chain CDRs of antibody 1G1, and a light chain variable domain comprising the three light chain CDRs of antibody 1G1, and the first and/or second FRα antigen-binding domain comprises a heavy chain variable domain comprising the three heavy chain CDRs of antibody 8K22, and a light chain variable domain comprising the three light chain CDRs of antibody 8K22.

32 . The antibody construct according to claim 31 , wherein the first and second 4-1BB antigen-binding domain comprises a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v28684 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v28684, and the first and/or second FRα antigen-binding domain comprises a heavy chain variable domain (VH) sequence that is at least 85% identical to the VH sequence of v23807 and a light chain variable domain (VL) sequence that is at least 85% identical to the VL sequence of v23807.

33 . The antibody construct according to claim 32 , comprising a first heavy chain polypeptide sequence as set forth in SEQ ID NO:353, a second heavy chain polypeptide sequence as set forth in SEQ ID NO:349, and a light chain polypeptide sequence as set forth in SEQ ID NO:346.

34 . The antibody construct according to claim 1 , conjugated to a drug.

35 . A pharmaceutical composition comprising the antibody construct of claim 1 .

36 . One or more nucleic acids encoding the antibody construct according to claim 1 .

37 . One or more vectors comprising the one or more nucleic acids according to claim 36 .

38 . An isolated cell comprising the one or more nucleic acid according to claim 36 .

39 . A method of preparing the antibody construct according to claim 1 , comprising culturing an isolated cell of claim 38 comprising one or more nucleic acids encoding the antibody construct under conditions suitable for expressing the antibody construct, and purifying the antibody construct.

40 . A method of treating a subject having a cancer, comprising administering to the subject an effective amount of the antibody construct according to claim 1 .

41 .- 43 . (canceled)

44 . An antibody construct or antigen-binding fragment thereof, that specifically binds to 4-1BB, comprising: a heavy chain variable sequence comprising three heavy chain CDRs and a light chain variable sequence comprising three light chain CDRs, wherein the heavy chain CDRs and the light chain CDRs are from any one of antibodies 1G1, 1B2, 1C3, 1C8, 2A7, 2E8, 2H9, 3D7, 3H1, 3E7, 3G4, 4B11, 4E6, 4F9, 4G10, 5E2, 5G8, or 6B3.

45 .- 64 . (canceled)

65 . An antibody construct or antigen-binding fragment thereof, that specifically binds to FRα, comprising: a heavy chain variable (VH) sequence comprising three CDRs and a light chain variable (VL) sequence comprising three CDRs, wherein the heavy chain CDRs and the light chain CDRs are from antibody 8K22 or 1H06.

66 .- 83 . (canceled)