Clinical data, Pathological Classification, and Risk Stratification and Follow-up:
The age, gender, symptoms, tumor size, location, imaging details wherever available, and treatment given (surgery / chemotherapy / radiation therapy / autologous stem cell transplantation) were noted from the records of Department of Paediatrics and the cohort characteristics are previously published.15 Age, morphology, and MKI was combined to classify the cases into favorable and unfavorable histological subtypes as per INPC. The risk group stratification as per the International Neuroblastoma risk Group (INRG) was performed by accounting for the stage, age, morphology, MYCN, and ploidy. The information for 11q aberrations was not available and the INRG subtyping was done without it.