A four year old boy was admitted with a history of abdominal pain and fever for two months maculopapular rash for ten days, and dry cough. dyspnea and wheezing_ for three days. On examination Ii er and spleen were enlarged 4 cm and 3 cm respecimey bekm the eastal ntargin. His hemoglobin vas 10.0 gidl. platelet count 3.7 x 10% and total leukocyte count 70 x 10%, which included 80% eosinophils Bone marrow examination revealed a cellular marrow comprising of 45% blasts and 34% Eosinophils and cosinophill pre-cursors. The blasts stained negative for my eloperoxidase and non- specific esterase and were positive for CD19. CD 10, CD22 and CD20. Which one of the following statements is not true about disease?