IP Library Granted Patent US 12,590,169
Granted Patent B2
US 12,590,169 · App. 17/283,830 · Granted Mar 31, 2026

5T4 single domain antibodies and therapeutic compositions thereof

Inventors: John C. Timmer (La Jolla, CA); Michael D. Kaplan (La Jolla, CA); Katelyn M. Willis (La Jolla, CA); Rajay A. Pandit (La Jolla, CA); Angelica N. Sanabria (La Jolla, CA); Sydney A. Barnes (La Jolla, CA); Margaret E. Haerr (La Jolla, CA); Brendan P. Eckelman (La Jolla, CA); Rutger H. Jackson (La Jolla, CA)
Assignee: Inhibrx Biosciences, Inc.
C07K16/30A61P35/00C07K14/56C07K14/565C07K14/57C07K16/2809C07K16/2818C07K16/283C07K2317/21C07K2317/24C07K2317/31C07K2317/33C07K2317/35C07K2317/565C07K2317/569C07K2317/624C07K2317/71C07K2317/72C07K2317/76C07K2317/92C07K2319/00C07K2319/50
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Quick Facts
Patent No.
US 12,590,169
App. No.
17/283,830
Granted
Mar 31, 2026
Kind
B2
Abstract

Provided herein are binding polypeptides that specifically bind 5T4. More specifically, provided herein are fusion proteins, including multivalent and/or multispecific constructs and chimeric antigen receptors, that bind 5T4. Also provided are pharmaceutical compositions containing the polypeptides, nucleic acid molecules encoding the polypeptides and vectors and cells thereof, and methods of use and uses of the provided 5T4 binding polypeptides for treating diseases and conditions, such as cancer.

Claims (29)

1 . A 5T4-binding polypeptide construct, comprising at least one heavy chain only variable domain (5T4 VHH domain) comprising a complementarity determining region 1 (CDR1) comprising the amino acid sequence selected from the group consisting of SEQ ID NO: 86-87 and 288-292, 296, and 297; a complementarity determining region 2 (CDR2) comprising the amino acid sequence selected from the group consisting of SEQ ID NO: 88-99, 298, and 299; and a complementarity determining region 3 (CDR3) comprising the amino acid sequence selected from the group consisting of SEQ ID NO: 100-102, 300, 301, and 303.

2 . The 5T4-binding polypeptide construct of claim 1 , wherein the at least one 5T4 VHH domain is humanized.

3 . The 5T4-binding polypeptide construct of claim 1 , wherein the polypeptide construct comprises an immunoglobulin Fc region.

4 . The 5T4-binding polypeptide construct of claim 1 that is a dimer.

5 . The 5T4-binding polypeptide construct of claim 3 , wherein the Fc region is a heterodimeric Fc region.

6 . The 5T4-binding polypeptide construct of claim 1 , wherein the at least one 5T4 VHH domain comprises (i) the sequence set forth in SEQ ID NO: 245, (ii) a humanized variant of SEQ ID NO:245, or (iii) a sequence of amino acids that exhibits at least 85% sequence identity to SEQ ID NO:245 and binds 5T4.

7 . The 5T4-binding polypeptide construct of claim 1 , wherein

the at least one 5T4 VHH domain comprises a CDR1, CDR2 and CDR3 set forth in SEQ ID NOS: 288, 88, and 100, respectively; or SEQ ID NOS: 289, 88, and 100, respectively.

8 . The 5T4-binding polypeptide construct of claim 1 , wherein the at least one 5T4 VHH domain comprises the sequence of amino acids set forth in any one of SEQ ID NOs: 246-253 and 360 or a sequence of amino acids that exhibits at least 85% sequence identity to any of SEQ ID NO: 246-253 and 360 and binds 5T4.

9 . The 5T4-binding polypeptide construct of claim 1 , wherein the at least one 5T4 VHH domain comprises (i) the sequence set forth in SEQ ID NO: 255, (ii) a humanized variant of SEQ ID NO: 255, or (iii) a sequence of amino acids that exhibits at least 85% sequence identity to SEQ ID NO: 255 and binds 5T4.

10 . The 5T4-binding polypeptide construct of claim 1 , wherein

the at least one 5T4 VHH domain comprises a CDR1 comprising the amino acid sequence selected from the group consisting of SEQ ID NOS: 86, 290-292; a CDR2 comprising the amino acid sequence selected from the group consisting of SEQ ID NO: 89-94; and a CDR3 comprising the amino acid sequence set forth in SEQ ID NO: 101.

11 . The 5T4-binding polypeptide construct of claim 1 , wherein the at least one 5T4 VHH domain comprises the sequence of amino acids set forth in any one of SEQ ID NOs: 256-275 or a sequence of amino acids that exhibits at least 85% sequence identity to any of SEQ ID NO: 256-275 and binds 5T4.

12 . The 5T4-binding polypeptide construct of claim 1 , wherein the at least one 5T4 VHH domain comprises (i) the sequence set forth in SEQ ID NO: 276, (ii) a humanized variant of SEQ ID NO: 276, or (iii) a sequence of amino acids that exhibits at least 85% sequence identity to SEQ ID NO: 276 and binds 5T4.

13 . The 5T4-binding polypeptide construct of claim 1 , wherein

the at least one 5T4 VHH domain comprises a CDR1 comprising the amino acid sequence selected from the group consisting of SEQ ID NOS: 86 and 87; a CDR2 comprising the amino acid sequence selected from the group consisting of SEQ ID NOS: 95-99; and a CDR3 comprising the amino acid sequence set forth in SEQ ID NO: 102.

14 . The 5T4-binding polypeptide construct of claim 1 , wherein the at least one 5T4 VHH domain comprises the sequence of amino acids set forth in any one of SEQ ID NOs: 277-287 or a sequence of amino acids that exhibits at least 85% sequence identity to any one of SEQ ID NO: 277-287 and binds 5T4.

15 . The 5T4-binding polypeptide construct of claim 1 , wherein

the at least one 5T4 VHH domain comprises (i) the sequence set forth in SEQ ID NO: 294, 295, or 302, (ii) a humanized variant of SEQ ID NO: 294, 295, or 302, or (iii) a sequence of amino acids that exhibits at least 85% sequence identity to SEQ ID NO: 294, 295, or 302 and binds 5T4.

16 . The 5T4-binding polypeptide construct of claim 1 , wherein the 5T4-binding polypeptide construct comprises a first 5T4 VHH domain that specifically binds 5T4 and a second 5T4 VHH domain that specifically binds 5T4, wherein the first and second 5T4 VHH domains comprise the CDR1 comprising the amino acid sequence selected from the group consisting of SEQ ID NO: 86-87 and 288-292, 296, and 297; the CDR2 comprising the amino acid sequence selected from the group consisting of SEQ ID NO: 88-99, 298, and 299; and the CDR3 comprising the amino acid sequence selected from the group consisting of SEQ ID NO: 100-102, 300, 301, and 303.

17 . The 5T4-binding polypeptide construct of claim 16 , wherein:

the first 5T4 VHH domain comprises the amino acid sequence set forth in any one of SEQ ID NOS: 245-253, 295, 302, and 360, a humanized variant thereof, or a sequence of amino acids that exhibits at least 85% sequence identity to any of SEQ ID NOS: 245-253, 295, 302, and 360, and binds 5T4; and

the second 5T4 VHH domain comprises the amino acid sequence set forth in any one of SEQ ID NOS: 255-287, 294, 302, a humanized variant thereof, or a sequence of amino acids that exhibits at least 85% sequence identity to any of SEQ ID NOS: 255-287, 294, 302, and binds 5T4.

18 . The 5T4-binding polypeptide construct of claim 1 , wherein the at least one 5T4 VHH domain comprises a CDR1, CDR2 and CDR3 set forth in SEQ ID NOS: 290, 90, and 101, respectively; SEQ ID NOS: 290, 91, and 101, respectively; SEQ ID NOS: 290, 92, and 101, respectively; SEQ ID NOS: 290, 93, and 101, respectively; SEQ ID NOS: 290, 94, and 101, respectively; SEQ ID NOS: 291, 94, and 101, respectively; SEQ ID NOS: 292, 94, and 101, respectively; or SEQ ID NOS: 86, 94, and 101, respectively.

19 . The 5T4-binding polypeptide construct of claim 1 , wherein the at least one 5T4 VHH domain comprises a CDR1, CDR2 and CDR3 set forth in SEQ ID NOS: 87, 95, and 102, respectively; SEQ ID NOS: 87, 96, and 102, respectively; SEQ ID NOS: 87, 97, and 102, respectively; SEQ ID NOS: 87, 98, and 102, respectively; SEQ ID NOS: 87, 99, and 102, respectively; or SEQ ID NOS: 86, 98, and 102, respectively.

20 . The 5T4-binding polypeptide construct of claim 1 , wherein the at least one 5T4 VHH domain comprises a CDR1 comprising the amino acid sequence selected from the group consisting of SEQ ID NOS: 288, 296, or 297; a CDR2 comprising the amino acid sequence selected from the group consisting of SEQ ID NOS: 88, 298, or 299; and a CDR3 comprising the amino acid sequence selected from the group consisting of SEQ ID NO:300, 301, or 303.

21 . An isolated single domain antibody (sdAb) that binds 5T4, comprising a complementarity determining region 1 (CDR1) comprising the amino acid sequence selected from the group consisting of SEQ ID NO: 86-87 and 288-292, 296, and 297; a complementarity determining region 2 (CDR2) comprising the amino acid sequence selected from the group consisting of SEQ ID NO: 88-99, 298, and 299; and a complementarity determining region 3 (CDR3) comprising the amino acid sequence selected from the group consisting of SEQ ID NO: 100-102, 300, 301, and 303.

22 . The isolated single domain antibody of claim 21 , comprising the amino acid sequence set forth in any of SEQ ID NOS: 245-253, 255-287, 294, 295, 302, and 360, or a sequence of amino acids that exhibits at least 85% sequence identity to any of SEQ ID NOS: 245-253, 255-287, 294, 295, 302, and 360, and binds 5T4.

23 . A pharmaceutical composition comprising the 5T4-binding polypeptide construct of claim 1 .

Assignments (5)
SECURITY INTEREST Recorded Jan 14, 2025
From: INHIBRX BIOSCIENCES, INC.
To: OXFORD FINANCE LLC; OXFORD FINANCE LLC
Reel/Frame 069894/0045 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 10, 2024
From: INHIBRX, INC.
To: INHIBRX BIOSCIENCES, INC.
Reel/Frame 067679/0635 →
RELEASE OF SECURITY INTEREST Recorded Jun 3, 2024
From: OXFORD FINANCE LLC, AS COLLATERAL AGENT
To: INHIBRX, INC.
Reel/Frame 067606/0247 →
INTELLECTUAL PROPERTY SECURITY AGREEMENT Recorded Feb 28, 2022
From: INHIBRX, INC.
To: OXFORD FINANCE LLC
Reel/Frame 059262/0780 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 5, 2021
From: TIMMER, JOHN C.; KAPLAN, MICHAEL D.; WILLIS, KATELYN M.; PANDIT, RAJAY A.; SANABRIA, ANGELICA N.; BARNES, SYDNEY A.; HAERR, MARGARET E.; ECKELMAN, BRENDAN P.; JACKSON, RUTGER H.
To: INHIBRX, INC.
Reel/Frame 057097/0600 →
Continuity (3)
Provisional Application 62877824 · Jul 23, 2019
Provisional Application 62744631 · Oct 11, 2018
Related Publication 20210340273A1 · Nov 4, 2021
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