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   V. A. Ivanov et al, 2018, Colorectal Oncology CrossRef
2. Neoadjuvant chemoradiotherapy for locally advanced rectal cancer with peritumoral abscesses and fistulas
   Sergey Gordeyev et al, 2022, Strahlentherapie und Onkologie CrossRef
3. A cutaneous metastasis of unresectable rectal adenocarcinoma: A case report and literature review
   Riyadh Hakami et al, 2020, International Journal of Surgery Case Reports CrossRef
4. Prostate cancer featuring a unique progression pattern: A case of prominent direct perineal invasion without definite metastasis
   Takato Nishino et al, 2021, Urology Case Reports CrossRef