Received: 17 August 2020
Accepted: 29 November 2020
First Online: 9 December 2020
Ethics approval and consent to participate
: All procedures performed on patient tumor samples in this study were in accordance with the ethical standards of the Institute Ethics Committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.Since this was a retrospective observational study and did not involve actual patients or patient’s images, ethical approval was not sought for this study. Informed consent was obtained in patients in whom follow up was available.
: Written informed consent was obtained.
: It is declared that all authors have no conflict of interest.