SHARED NEOANTIGEN VACCINES

1 . A composition for delivery of a self-amplifying alphavirus-based expression system,

wherein the composition for delivery of the self-amplifying alphavirus-based expression system comprises:

(A) the self-amplifying alphavirus-based expression system, wherein the self-amplifying alphavirus-based expression system comprises one or more vectors, wherein the one or more vectors comprises:

(a) an RNA alphavirus backbone, wherein the RNA alphavirus backbone comprises:

(i) at least one promoter nucleotide sequence, and

(ii) at least one polyadenylation (poly(A)) sequence; and

(b) a cassette, wherein the cassette comprises:

(i) at least one antigen-encoding nucleic acid sequence comprising:

a. an epitope-encoding nucleic acid sequence, optionally comprising at least one alteration that makes the encoded epitope sequence distinct from the corresponding peptide sequence encoded by a wild-type nucleic acid sequence,

b. optionally a 5′ linker sequence, and

c. optionally a 3′ linker sequence;

(ii) optionally, a second promoter nucleotide sequence operably linked to the at least one antigen-encoding nucleic acid sequence; and

(iii) optionally, at least one second poly(A) sequence, wherein the second poly(A) sequence is a native poly(A) sequence or an exogenous poly(A) sequence to the alphavirus, and

(B) a lipid-nanoparticle (LNP), wherein the LNP encapsulates the self-amplifying alphavirus-based expression system, and

wherein the composition comprises at least 10 μg of each of the one or more vectors.

2 . (canceled)

3 . The composition of claim 1 , wherein the composition for delivery of the self-amplifying alphavirus-based expression system comprises at least 30 μg of each of the one or more vectors.

4 . The composition of claim 1 , wherein the composition for delivery of the self-amplifying alphavirus-based expression system comprises at least 100 μg of each of the one or more vectors.

5 . (canceled)

6 . (canceled)

7 . The composition of claim 1 , wherein the composition for delivery of the self-amplifying alphavirus-based expression system comprises between 10-30 μg, 10-100 μg, or 10-300 μg of each of the one or more vectors.

8 - 15 . (canceled)

16 . The composition claim 1 , wherein the one or more vectors is at a concentration of 1 mg/mL.

17 - 89 . (canceled)

90 . A composition for delivery of a chimpanzee adenovirus (ChAdV)-based expression system,

wherein the composition for delivery of the ChAdV-based expression system comprises:

the ChAdV-based expression system, wherein the ChAdV-based expression system comprises a viral particle comprising a ChAdV vector, wherein the ChAdV vector comprises:

(a) a ChAdV backbone, wherein the ChAdV backbone comprises:

(i) at least one promoter nucleotide sequence, and

(ii) at least one polyadenylation (poly(A)) sequence; and

(b) a cassette, wherein the cassette comprises:

(i) at least one antigen-encoding nucleic acid sequence comprising:

a. an epitope-encoding nucleic acid sequence, optionally comprising at least one alteration that makes the encoded epitope sequence distinct from the corresponding peptide sequence encoded by a wild-type nucleic acid sequence,

b. optionally a 5′ linker sequence, and

c. optionally a 3′ linker sequence; and

wherein the cassette is operably linked to the at least one promoter nucleotide sequence and the at least one poly(A) sequence, and wherein the composition comprises 1×10 12 or less of the viral particles.

91 . (canceled)

92 . (canceled)

93 . The composition of claim 90 , wherein the composition for delivery of the ChAdV-based expression system comprises at least 1×10 11 of the viral particles.

94 . The composition of claim 90 , wherein the composition for delivery of the ChAdV-based expression system comprises between 1×10 12 .

95 . The composition of claim 90 , wherein the composition for delivery of the ChAdV-based expression system comprises 1×10 11 , 3×10 11 , or 1×10 12 of the viral particles.

96 . The composition of claim 90 , wherein the viral particles are at a concentration of at 5×10 11 vp/mL.

97 . The composition of claim 1 , wherein the epitope-encoding nucleic acid sequence encodes an epitope known or suspected to be presented by MHC class I on a surface of a cell, wherein the surface of the cell is a tumor cell surface or an infected cell surface, and optionally wherein the cell is a subject's cell.

98 . The composition of claim 97 , wherein the cell is a tumor cell selected from the group consisting of: lung cancer, melanoma, breast cancer, ovarian cancer, prostate cancer, kidney cancer, gastric cancer, colon cancer, testicular cancer, head and neck cancer, pancreatic cancer, brain cancer, B-cell lymphoma, acute myelogenous leukemia, chronic myelogenous leukemia, chronic lymphocytic leukemia, T cell lymphocytic leukemia, non-small cell lung cancer, and small cell lung cancer, or wherein the cell is an infected cell selected from the group consisting of: a pathogen infected cell, a virally infected cell, a bacterially infected cell, an fungally infected cell, and a parasitically infected cell.

99 - 112 . (canceled)

113 . The composition of claim 90 , wherein the ChAdV backbone comprises at least nucleotides 2 to 36,518 of the sequence set forth in SEQ ID NO:1, wherein the nucleotides 2 to 36,518 lack: (1) nucleotides 577 to 3403 of the sequence shown in SEQ ID NO:1 corresponding to an E1 deletion; (2) nucleotides 27,125 to 31,825 of the sequence shown in SEQ ID NO:1 corresponding to an E3 deletion; and (3) nucleotides 34,916 to 35,642 of the sequence shown in SEQ ID NO:1 corresponding to a partial E4 deletion; optionally wherein the antigen cassette is inserted within the E1 deletion.

114 - 132 . (canceled)

133 . The composition of claim 1 , wherein the epitope-encoding nucleic acid sequence encodes an epitope known or suspected to be expressed in a subject known or suspected to have cancer selected from the group consisting of: MSS-CRC, NSCLC, and PDA.

134 - 178 . (canceled)

179 . The composition of claim 1 , wherein the composition for delivery of the expression system is formulated in a pharmaceutical composition comprising a pharmaceutically acceptable carrier.

180 . A kit comprising the composition for delivery of the expression system of claim 1 , and instructions for use.

181 . (canceled)

182 . (canceled)

183 . (canceled)

184 . (canceled)

185 . The composition of claim 1 , wherein the epitope-encoding nucleic acid sequence comprises an epitope selected from the group consisting of SEQ ID NO: 57-29,357 and SEQ ID NO: 29,512-29,519.

186 . (canceled)

187 . (canceled)

188 . (canceled)

189 . The composition of claim 1 , wherein the at least one antigen-encoding nucleic acid sequence comprises at least each of:

(A) a KRAS_G12C MHC class I epitope encoding nucleic acid sequence,

(B) a KRAS_G12D MHC class I epitope encoding nucleic acid sequence, and

(C) a KRAS_G12V MHC class I epitope encoding nucleic acid sequence.

190 . (canceled)

191 . (canceled)

192 . (canceled)

193 . (canceled)

194 . (canceled)

195 . (canceled)

196 . A method for stimulating an immune response in a subject, the method comprising administering to the subject a composition for delivery of a self-amplifying alphavirus-based expression system and administering to the subject a composition for delivery of a chimpanzee adenovirus (ChAdV)-based expression system, and

wherein either:

a. the composition for delivery of the ChAdV-based expression system comprises the ChAdV-based expression system, wherein the ChAdV-based expression system comprises a viral particle comprising a ChAdV vector, and wherein the composition comprises 1×10 12 or less of the viral particles,

b. wherein the composition for delivery of the self-amplifying alphavirus-based expression system comprises the self-amplifying alphavirus-based expression system, wherein the self-amplifying alphavirus-based expression system comprises one or more vectors, and wherein the composition comprises at least 10 μg of each of the one or more vectors, or

c. the composition for delivery of the ChAdV-based expression system comprises the ChAdV-based expression system, wherein the ChAdV-based expression system comprises a viral particle comprising a ChAdV vector, and wherein the composition comprises 1×10 12 or less of the viral particles and wherein the composition for delivery of the self-amplifying alphavirus-based expression system comprises the self-amplifying alphavirus-based expression system, wherein the self-amplifying alphavirus-based expression system comprises one or more vectors, and wherein the composition comprises at least 10 μg of each of the one or more vectors.

197 . The method of claim 196 , wherein the composition for delivery of the ChAdV-based expression system is administered as a priming dose and the composition for delivery of the self-amplifying alphavirus-based expression system is administered as one or more boosting doses.

198 - 434 . (canceled)