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Maria I. Castellanos


Pediatric hematologist-oncologist
Mother, amateur samba dancer, first-gen Latina doctor

About me

Pronouns: She | Her | Hers

Dr. Maria I. Castellanos is a pediatric hematologist-oncologist who cares for children and adolescents with various types of cancer and blood disorders. She is a native Spanish speaker.

In her research, Castellanos is interested in why different populations of children with cancer have different survival rates. She aims to elucidate the causes of cancer health disparities, reduce the survival gap and ensure equal access to treatment for all patients. In particular, she studies how geography and social determinants of health (nonmedical factors that affect wellness, such as housing and exposure to racism) impact childhood cancer survival.

Castellanos earned her medical degree at Howard University College of Medicine. She completed a residency in pediatrics at Lucile Packard Children's Hospital Stanford and a fellowship in pediatric hematology-oncology at Texas Children's Hospital, an affiliate of Baylor College of Medicine.

  • Education

    Howard University, MD, 2014

  • Residencies

    Stanford University, Lucile Packard Children's Hospital, Pediatrics, 2017

  • Fellowships

    Baylor College of Medicine, Texas Children's Hospital, Pediatric Hematology-Oncology, 2021

  • Board Certifications

    Pediatrics, American Board of Pediatrics

  • Academic Title

    Assistant Professor

  • Languages


It is an honor and privilege to care for patients and families in their most vulnerable times. I strive to ensure the best outcomes for all.

Where I see patients (3)

    Decorative Caduceus

    Studying the Effect of Levocarnitine in Protecting the Liver From Chemotherapy for Leukemia or ...

    For patients assigned to arms A and B, the investigators will separately estimate the proportion of patients who experience conjugated hyperbilirubinemia > 3mg/dL during induction chemotherapy by arm along with corresponding 95% c...


    More about this study
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    Fetal surgery firsts

    The first open fetal surgery in the world was performed at UCSF in the early 1980s.