Birc2, also known as baculoviral IAP repeat-containing 2, is a gene involved in regulating fundamental cell death and survival signaling pathways [5]. It can interact with other proteins, and its functions may relate to processes like immune response modulation and cell cycle regulation. The gene's role has been studied through various models to understand its biological importance in different physiological and pathological conditions.

Knockdown of BIRC2 in mouse melanoma or breast cancer cells increases the expression of chemokine CXCL9, impairs tumor growth by augmenting intratumoral activated CD8+ T cells and natural killer cells, and enhances the sensitivity of these tumors to anti-CTLA4 and/or anti-PD1 immune checkpoint blockade (ICB), indicating its role in cancer immune evasion and resistance to ICB [1]. In LPS-mediated C28/I2 cells (an in vitro rheumatoid arthritis (RA) cellular model), BIRC2 knockdown alleviates necroptosis, oxidative stress, and inflammation, and BIRC2 positively regulates TRADD expression, suggesting its potential as a novel target for RA treatment [2]. In hepatocellular carcinoma (HCC), BIRC2 promotes the ubiquitination-dependent degradation of NFκB-inducing kinase (NIK), inactivating the non-canonical NFκB signaling pathway, decreasing MHC-I expression, and protecting HCC cells from T cell-mediated cytotoxicity. Silencing or inhibiting BIRC2 increases the sensitivity of HCC cells to immune killing and improves the function of T cells, enhancing the efficacy of anti-PD-1 therapy [3]. In α7-HPV-related cervical squamous cell carcinoma (SCC), miR-143-3p targets BIRC2, and high BIRC2 expression is associated with poor outcomes. A combination of BIRC2-inhibitor LCL161 and topotecan shows synergistic effects on cancer cells and animal tumor models [4].

In conclusion, Birc2 plays crucial roles in multiple disease-related biological processes. Gene-knockout or knockdown models have revealed its functions in cancer immune evasion, rheumatoid arthritis progression, and HCC immune escape. Understanding Birc2's functions through these models provides potential therapeutic targets for cancer, rheumatoid arthritis, and other related diseases.