V. K. Saini, G. Singh, S. Regmi, S. Masood, and A. Pandey, “Factors influencing response to neoadjuvant chemoradiotherapy in rectal cancer: the role of serum carcinoembryonic antigen and tumor size”, Int J Clin Trials, vol. 12, no. 4, pp. 369–371, Oct. 2025.