“…3 With but a single exception, which might TlI'l1e after start of rr-e.or rncrrr in months There is unfortunately little published information on this point, despite the voluminous case material which must exist in many departments. Pitcock et al (28) report an average recurrence-free interval of nine months in six children with Stage I disease treated with doses less than 1,800 r. The available data for adults (4,5,10,12), together with observations on our own palliative series, are presented in Figure 3. It will be seen that the duration of the first remission is usually about eight to twelve months, and that remissions longer than twenty-four months occurred in only 17 per cent of the cases.…”