Dalla Chiesa M, Passalacqua R, Michiara, et al. M. Tamoxifen vs Tamoxifen plus 13-cis-retinoic acid vs Tamoxifen plus Interferon a–2a as first-line endocrine treatments in advanced breast cancer: updated results of a phase II, prospective, randomised multicentre trial. Acta Biomed. 2007;78(3):204-209. Accessed December 18, 2025. https://www.mattioli1885journals.com/index.php/actabiomedica/article/view/1903