Hi @karishma, welcome to Connect.
Staging takes into consideration more than just the size of the cancer. It also considers whether is has spread to the lymph nodes or other organs. This article from the American Cancer Society explains staging in detail

- Staging Renal Cell Cancer https://www.cancer.org/cancer/kidney-cancer/detection-diagnosis-staging/staging.html

I'd also like to bring fellow members @apr931 @jimchardy @w5wiggi and @jewels5 into this discussion. You'll find other discussions about Kidney Cancer on Connect here:
- Renal cell cancer , kidney removed right side 2013, came back in 2015 https://connect.mayoclinic.org/discussion/renal-cell-cancer-kidney-removed-right-side-2013-came-back-in-2015/
- Renal Cancer: What are you supposed to feel after surgery? https://connect.mayoclinic.org/discussion/what-are-suppose-to-feel-after-sugary/

Karishma, has your friend been given a treatment plan yet? What treatments are being suggested?