In how many cases is an orchiectomy needed to treat cancer?

Orchiectomy is the. Curative choice in testis cancer, regardless of histology. It is quite effective as a palliative measure is advanced prostate cancer (disease alrady spread to bones and painful), but often refused by patients, and sometimes not mentioned by doctors. Anti-hormone pharmaceuticals do the same thing at much higher price.
Almost all cases. There is virtually no case or testicular cancer where orchiectomy should be avoided. Possibly a very small, discreet tumor of low malignancy in a solitary testis could be considered for a partial orchiectomy. Surgery is always required.