This study investigates nutritional status, at predefined points in therapy, and the association with outcomes in children and adolescents undergoing treatment for cancer in institutions under Asociación de Hemato-Oncología Pediátrica de Centro América (AHOPCA) consortium in Central America. The aim of the study is to examine the effects of the newly-established nutritional program aimed at improving the delivery of nutritional care and outcomes in children undergoing treatment for cancer in Central America.

In low and middle-income countries, children with cancer are simultaneously dealing with malnutrition in high proportions. Without proper access to care and a minimal or basic level of care, these children are exposed to worse conditions. Studies have shown that more than half of the children with cancer are also malnourished at diagnosis. This increases children's risk of complications associated with the treatment as well as the abandonment of care, as well as decrease the level of survival rates. With an established nutritional education and clinical intervention program, the outcomes of these children can be improved, especially in Central America where the cancer rates and malnutrition is high, as shown by several studies.

Inclusion Criteria:

• Diagnosis of childhood cancer (Solid tumors, Acute Lymphoblastic Leukemia (ALL), other Lymphomas)
• Recruited at diagnosis
• Under the age of 18 years

Exclusion Criteria:

• Other cancer diagnosis
• Palliative care patients

Patients diagnosed with childhood cancer in participating sites in Central American countries specified in the protocol, will be recruited at diagnosis. A total of 1000 patients are anticipated for the study in AHOPCA affiliated institutions and patients will be recruited and consented (including parents) by a designated researcher.