Study of SGR-3515 In Participants With Advanced Solid Tumors.

Inclusion Criteria:

* Diagnosis of advanced/metastatic solid tumor
* Measurable disease per RECIST version 1.1
* Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1
* Participant must understand and sign an Informed Consent Form (ICF) prior to any study-related assessments/procedures
* Adequate bone marrow and organ function
* Women of child-bearing potential (WOCBP) or males must agree to use highly effective contraception for the duration of study and for 90 days after the last dose of study drug

Exclusion Criteria

* Participants with primary Central Nervous System (CNS tumors).
* Participant has received prior systemic anti-cancer treatments or other investigational agents ≤ 21 days of first dose of study drug, or 5 half-lives, whichever is shorter
* Participant who has received definitive local control radiation (any dose greater than 50 Gy) \< 42 days prior to the first dose of study drug.
* Participant who has received major surgeries ≤ 21 days prior to first dose of study drug
* Participants who have not recovered to Grade 1 or baseline levels from toxicity or adverse events related to prior treatment for their cancer, excluding Grade 2 alopecia, peripheral neuropathy and ototoxicity.
* Participant who has another clinically significant invasive malignancy, as determined by the investigator, ≤ 2 years prior to the first dose