KIAA1217 is a multifunctional protein with critical roles in skeletal development and cancer progression. Developmentally, KIAA1217 is required for normal intervertebral disk development 1, with mutations associated with both isolated and syndromic vertebral malformations 2. Genetic variants in KIAA1217 show significant association with lumbar disc herniation susceptibility in multiple populations 1. Beyond developmental functions, KIAA1217 acts as an oncogenic driver in multiple cancer types. In lung adenocarcinoma, KIAA1217-RET fusion proteins activate PI3K/AKT and ERK signaling pathways, promoting cell growth and invasion; notably, these fusion proteins show sensitivity to vandetanib treatment 3. In hepatocellular carcinoma, KIAA1217 functions as a cytoplasmic adaptor or scaffold protein that promotes epithelial-mesenchymal transition and metastasis by interacting with and activating JAK1/2-STAT3 signaling, with elevated expression correlating with poor patient survival 4. KIAA1217 copy number variations are frequently detected in HCC tissues 5. Additionally, KIAA1217 variants show potential associations with age at onset of bipolar disorder through gene-gene interactions 6. These findings establish KIAA1217 as both a developmental regulator and therapeutic target across multiple diseases.