Protocol III DXM on days 1-15; VCR on days 1 and 8; DOX on days 1 and 8; PEG-L-ASP on day 1; CPM on day 15; ARA-C on days 17-20 and 24-27; TG on days 15 - 28 and MTX IT on days 17 and 24, also on day 1 in patients with initial CNS involvement HR-1' DXM on days 1-5; VCR on days 1 and 6; HD-MTX on day 1; CPM every 12 hours on days 2-4 (5 doses); HD-ARA-C every 12 hours on day 5 (2 doses); PEG-L-ASP on day 6, MTX IT on day 1 HR-2' DXM on days 1 to 5; VDS on days 1 and 6; HD-MTX on day 1; IFO every 12 hours on days 2-4 (5 doses); DNR on day 5; PEG-L-ASP on day 6; MTX IT on day 1 and 1 in patients with initial CNS involvement also day 5 HR-3' DXM on days 1-5; ARA-C 4 x on days 1-2 in 12 h intervals; etoposide (VP-16) every 12 hours on days 3-5 (5 doses); PEG-L-ASP on day 6; MTX IT on day 1 DNX-FLA Flucytosine (FLU) on days 1-5 (5 doses); HD-ARA-C on days 1 to 5 (5 doses); liposomal daunorubicin (DNX) on days 1, 3 and 5 (3 doses); MTX IT on day 1