HYBRID TUMOR CLASSIFICATION USING VISION TRANSFORMERS AND PSO-OPTIMIZED FEATURE SELECTION WITH XGBOOST. int. J. Eng. Res. Sci. Tech. [Internet]. 2026 Apr. 7 [cited 2026 Aug. 17];22(2(1):159-66. Available from: https://ijerst.org/index.php/ijerst/article/view/2539