September is Childhood Cancer Awareness Month and it is a good time to reflect on the progress we have made in curing childhood cancer and how we got here. An important part has been the ability of all stakeholders to get together and enroll children with cancer on to clinical trails, specially multicentre collaborative research. In this first part I look at some of the earliest works done in North America and Europe and highlight a few studies.

This all started in 1948 when Sidney Farber attempted to use a folate antagonist, Aminopterin to block the function of folic acid in patients with acute leukemia in hopes of achieving remission - Temporary remissions in acute leukemia in children produced by folic acid antagonist, 4-aminopteroyl-glutamic acid. Of 16 children, 10 demonstrated clinical, hematological and pathological evidence of improvement for three months. At that time this observation was met with disbelief and also it was felt to be unethical to "experiment" with the life of a child with leukemia when cure was not possible.
Thankfully, he and others like him continued in their efforts. The relative rarity of the disease and the need for shared expertise in management led to the creation of the first pediatric oncology co-perative groups (Cancer and Leukemia Group B Cooperative Group as well as the Acute leukemia Chemotherapy Cooperative Study Group A) in the US in 1955 which were the forerunners of the now well established and respected Children's Oncology Group. For the last 65 years, COG in North America and SIOP in Europe have increased our knowledge and understanding of childhood cancers and conducted studies which have improved outcomes. Here are some of the earliest studies:
Childhood Leukemia
Two decades later, in 1980, the first collaborative efforts in childhood ALL from Europe were published on children treated on the BFM 70/76 protocol -
The Berlin Childhood Acute Lymphoblastic Leukemia Therapy Study, 1970–1976. The treatment protocol consisted of vincristine, prednisone, daunorubicin, L-asparaginase, cyclophosphamide, cytarabin, 6-mercaptopurine, intrathecal methotrexate, and cranial or craniospinal irradiation. Maintenance therapy was cyclic sequential administration of intravenous methotrexate and oral 6-mercaptopurine with 6-week reinduction pulses of prednisone/vincristine. 56.2% of patients were in complete continuous remission for a median of 67 months.
Childhood Solid Tumours
Childhood CNS Tumours
It was in 1990, that the first multicentre co-operative group studies were published on childhood CNS tumours in North America and Europe, almost at the same time. Both looked at the role of adjuvant chemotherapy in medulloblastoma.
Childhood Cancer Survivors
These studies are only a tiny reflection of the huge amount of collaborative work and scientific output which took place in the second half of the 20th century. Noticeably, there was a complete absence of such work from low and middle income countries (LMIC). Health professionals in these settings were also working hard to provide the best possible care to their patients while being hampered by limited resources. They were however unable to translate their efforts into regional or national collaborative efforts. Progress in this area happened much later and in my next blog post I will showcase milestones of childhood cancer collaborative research in LMIC.