Kovalyov, O. et al. 2026. PHENOTYPIC SHIFT OF ADENOCARCINOMA TO SQUAMOUS CELL CARCINOMA OF RECTUM AFTER NEOADJUVANT CHEMORADIOTHERAPY WITH DETECTION OF HPV16: A CLINICAL CASE. Experimental Oncology. 48, 2 (Aug. 2026), 172–180. DOI:https://doi.org/10.15407/exp-oncology.2026.02.172.