Emerging Diagnostics and Therapies in Neuroendocrine Neoplasms: A Critical Review

Neuroendocrine neoplasms (NENs) are biologically diverse tumors. This article is a critical review of recent evidence focusing on systemic therapies (through mid-2025). We summarize what is most practice-relevant and where gaps remain. In diagnosis, somatostatin-receptor PET/CT has largely replaced older scintigraphy, and adding FDG PET can flag more aggressive disease. Blood-based tests and selected tissue markers (e.g., MGMT, DAXX/ATRX/ALT) show promise but require cautious interpretation in routine care. In treatment, radioligand therapy (PRRT) is used earlier in appropriate receptor-positive disease; cabozantinib improves progression-free survival after prior therapy; and belzutifan offers a biomarker-guided option for malignant pheochromocytoma/paraganglioma. Immunotherapy remains limited to defined subsets, including high-grade neoplasms. We appraise strengths and limitations of key trials, note issues of access and toxicity, and highlight active areas in development (SSTR antagonists, alpha emitters, and dose-guided PRRT). Our goal is to provide a concise, evidence-based map of the field to support informed clinical judgment and future research priorities.