Rare Case of Germline GATA2-Deficiency With Merkel Cell Carcinoma and Acute Myeloid Leukemia

Background: Germline GATA2-deficiency usually manifests as immunodeficiencies and myeloid neoplasms and sometimes with dermatological diseases, including warts, panniculitis, and skin cancers. Case: We report a 36-year-old woman with germline GATA2-deficiency who developed Merkel cell carcinoma followed by acute myeloid leukemia. Molecular analysis revealed a germline GATA2 S447R variant, not reported from the previous reported case, suggesting a potential association with Merkel cell carcinoma. Conclusion: This case broadens the spectrum of solid cancers linked to GATA2-deficiency, emphasizing the need for considering primary immunodeficiency in young patients with myeloid neoplasms or rare skin cancers, facilitating early detection and treatments.