This clinical trial is evaluating a drug called ART0380 in participants with advanced or metastatic solid tumors. The main goals of this study are to:

* Find the recommended dose of ART0380 that can be given safely to participants alone and in combination with gemcitabine or irinotecan
* Learn more about the side effects of ART0380 alone and in combination with gemcitabine or irinotecan
* Learn more about the effectiveness of ART0380 alone and in combination with gemcitabine or irinotecan

This phase I/II trial studies the side effects and best dose of temozolomide and M1774 and how well they works in treating patients with cancer that has spread from where it first started (primary site) to other places in the body (metastatic) and may have spread to nearby tissue, lymph nodes, or distant parts of the body (advanced). Temozolomide is in a class of medications called alkylating agents. It works by damaging the cell's deoxyribonucleic acid (DNA) and may kill tumor cells and slow down or stop tumor growth. M1774 may stop the growth of cancer cells by blocking some of the enzymes needed for cell growth. Adding M1774 to temozolomide may shrink or stabilize cancer for longer than temozolomide alone.

A first in human study to evaluate the safety and preliminary antitumor activity of BBO-11818, a pan-KRAS inhibitor, in subjects with locally advanced unresectable or metastatic KRAS mutant solid tumors.