What was the survival rate for having wilms tumor before the 60's?

Rapidly improving!: In 1900, virtually no child diagnosed with wilm's tumor survived. Between then and the mid-1950s survival improved to about 50% due to improved surgery and routine radiation. At that time vincristine and actinomycin were found to be effective chemo drugs for this tumor; by 1965 2-year survival was improved to 80%. Today over 90% of children with wilm's tumor are cured.