On track to move its lead candidate, MC-339, into the clinic for small-cell lung cancer in 2024, Mariana Oncology Inc. raised $175 million through an oversubscribed series B round co-led by Deep Track Capital and Forbion. The radiopharmaceutical company was incubated for 18 months before raising $75 million through a series A in December 2021, and has since built out its R&D division and a phase I/II manufacturing unit. It currently has 50 employees.