For citations:
Mailyan O.A., Kanukoev K.Yu., Berezin P.G., Nyushko K.M., Gorbach V.A. Primary multiple synchronous tumors: soft tissue sarcoma of the retroperitoneal space and metastatic prostate cancer. Research and Practical Medicine Journal. 2020;7(2):171-178. (In Russ.) https://doi.org/10.17709/2409-2231-2020-7-2-16