<prompt> All are good prognostic factors for neuroblastoma exceptTrk-A expression absentAbsence of 1 p lossAbsence of 17 p gainAbsence of 11 q loss  <response>: The expression of specific neurotrophin receptors like TrkA are good prognostic factors for Neuroblastoma whereas expression of TrkB like neurotrophin receptors worsens the disease. Refer robbins 9e 260p 