Localized non-Hodgkin's lymphoma with B-cell histology: Cure without cyclophosphamide? A report of the United Kingdom Children's Cancer Study Group on studies NHL 8501 and NHL 9001 (1985-1996)

We have examined the outcome for children treated on two consecutive United Kingdom Children's Cancer Study Group studies of localized B-cell non-Hodgkin's lymphoma (NHL). The first study (NHL 8501; 1985-1989) included cyclophosphamide in the treatment regimen ata total cumulative dose of 4 g/m² whereas the regimen in the succeeding study (NHL 9001; 1990-1996) did not include cyclophosphamide. Ninety children with confirmed B-cell NHL were treated in the two studies (NHL 8501, n = 33 and NHL9001, n = 57). With a median follow-up of 7.5 years, overall survival for localized B-cell NHL did not differ between the two regimens with observed 3-year survivals of 94% [95% confidence interval (CI) 80-98%] and 89% (95% CI 79-95%) respectively (P = 0.47). There was also no difference in the event-free survival between children treated on regimen NHL 8501 and NHL 9001 [91% (95% CI 76-97%) vs 84% (95% CI 73-92%) after 3 years; P = 0.34]. Although the difference in the number of failed remissions between NHL 8501 and 9001 (0/33 vs 6/57) approached statistical significance (P = 0.08. Fisher's exact test), there was no overall statistical difference between the treatment failures on either regimen (P = 0.34). Substantial long-term survival can be achieved for many children with localized B-cell NHL without the use of cyclophosphamide. Further studies are needed to identify whether all clinical or histopathological subgroups will benefit equally from the omission of cyclophosphamide.