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Introduction: Transforming acidic coiled-coil containing protein 3 (TACC3) exerts a vital role in cancer progression by modulating cell division and facilitating tumor growth. Given the lack of comprehensive research on the pancancer implications of TACC3, our study aimed to analyze the functional role of TACC3 in pancancer and validate it through experimental investigations in lung adenocarcinoma. Methods: We first employed various bioinformatics techniques to investigate the expression and prognostic significance of TACC3 in pancancer. Subsequently, we analyzed the correlation between TACC3 and immune infiltration, immune checkpoints, drug sensitivity, as well as the prediction of immune therapy response. Finally, we validated the association between TACC3 and the proliferation of lung adenocarcinoma, as well as its resistance to docetaxel, through in vitro experiments. Results: Here, TACC3 exhibited high expression in human cancers and was associated with poor prognosis in various cancer types. It was also involved in immune infiltration and demonstrated a strong predictive ability for immune therapy response. Through drug sensitivity prediction, we further identified a potential association between TACC3 and docetaxel resistance, which was subsequently validated in lung adenocarcinoma. Conclusion: Our investigation of TACC3 revealed its potential as a promising target both for immunosuppression and docetaxel resistance in pancancer, especially in lung adenocarcinoma. [ABSTRACT FROM AUTHOR]