S095029 as Monotherapy and in Combination With Sym021 in Patients With Advanced Solid Tumor Malignancies Followed by an Expansion Part With Triple Combinations in Patients With Metastatic Gastric or Colorectal Cancers

S095029 will be administered via IV infusion every 2 weeks. Once the DLT evaluations period at the second dose level is completed and it is deemed as safe, the dose escalation part 1b will be initiated.

Sym021 will be administered at a fixed dose of 200mg. S095029 will be administered via IV infusion every 2 weeks. Once the RP2D dose of S95029 in combination with Sym21 is defined, dose expansion will begin.