Exhibit 99.1 News Release Puma Biotechnology Reports Fourth Quarter and Full Year 2023 Financial Results LOS ANGELES, Calif., Feb. 29, 2024 — Puma Biotechnology, Inc. (NASDAQ: PBYI), a biopharmaceutical company, announced financial results for the fourth quarter and year ended December 31, 2023. Unless otherwise stated, all comparisons are for the fourth quarter and full year 2023 compared to the fourth quarter and full year 2022. Product revenue, net consists entirely of revenue from sales of NERLYNX®, Pum ...