Circulating Biomarkers Associated with the Diagnosis and Prognosis of B-Cell Progenitor Acute Lymphoblastic Leukemia

SIMPLE SUMMARY: Acute lymphoblastic leukemia (ALL) is a hematological disease characterized by the malfunction of the hematopoietic system. This process is generated and perpetuated by several mechanisms that provide the disease with part of its malignancy potential and genetic and cytological characteristics. Disease pathological features are used for diagnosis and prognosis; however, most of them are obtained by a bone marrow aspirate, so it is crucial to find other less invasive methods to establish or complement the diagnosis, prognosis, and follow-up of the disease. A cancer biomarker is any measurable indicator demonstrating the presence of malignancy, tumor behavior, prognosis, or treatment responses. This review will summarize circulating diagnostic and prognosis biomarkers for B-cell progenitor ALL. ABSTRACT: Acute lymphoblastic leukemia (ALL) is a hematological disease characterized by the dysfunction of the hematopoietic system that leads to arrest at a specific stage of stem cells development, suppressing the average production of cellular hematologic components. BCP-ALL is a neoplasm of the B-cell lineage progenitor. BCP-ALL is caused and perpetuated by several mechanisms that provide the disease with its tumor potential and genetic and cytological characteristics. These pathological features are used for diagnosis and the prognostication of BCP-ALL. However, most of these paraclinical tools can only be obtained by bone marrow aspiration, which, as it is an invasive study, can delay the diagnosis and follow-up of the disease, in addition to the anesthetic risk it entails for pediatric patients. For this reason, it is crucial to find noninvasive and accessible ways to supply information concerning diagnosis, prognosis, and the monitoring of the disease, such as circulating biomarkers. In oncology, a biomarker is any measurable indicator that demonstrates the presence of malignancy, tumoral behavior, prognosis, or responses to treatments. This review summarizes circulating molecules associated with BCP-ALL with potential diagnostic value, classificatory capacity during monitoring specific clinic features of the disease, and/or capacity to identify each BCP-ALL stage regarding its evolution and outcome of the patients with BCP-ALL. In the same way, we provide and classify biomarkers that may be used in further studies focused on clinical approaches or therapeutic target identification for BCP-ALL.