A study of childhood renal tumours using xenogeneic antiserum.

Fifty-six primary childhood renal tumours, 14 normal and 12 fetal kidneys were examined for their staining reaction with xenogeneic anti-Wilms' antiserum. The antiserum was raised by injecting Wilms' tumour extracts into 6-month-old rabbits which had been rendered tolerant in utero with pooled normal kidney extracts. Renal carcinomas, mesoblastic nephroma and a large proportion of tubular wilms' tumours were stained by the antiserum. In contrast, 6 of 7 bone-metastasising renal tumours of childhood (BMRTC) failed to fluoresce when treated with the antiserum, suggesting that the BMRTC has a different origin from the other childhood renal tumours studied.