Dr. Kelly Casteel

I'm a hematologist-oncologist and a partner at Rocky Mountain Cancer Centers, practicing primarily from our Longmont, Colorado office and by telemedicine across the state. I care for the full range of blood and cancer diagnoses, but my deepest interest — and where I spend most of my teaching energy — is hematology: the benign and malignant disorders of the blood itself.

Hematology is full of ideas that are genuinely hard, and patients are too often handed those ideas without a translation. I think that's a failure we can fix. Whether I'm sitting across from a patient or building an interactive explainer, the goal is the same: take something complex and make it understandable without making it wrong.

Training & path home

I'm a native Coloradan. I earned my medical degree at Case Western Reserve University and completed my postgraduate training in Houston — a four-year combined residency in Internal Medicine and Pediatrics at UT Houston's McGovern Medical School, followed by a fellowship in adult medical oncology and hematology at UT MD Anderson Cancer Center.

I stayed on at MD Anderson as faculty and as Associate Program Director for the hematology-oncology fellowship, training the next generation of specialists — before deciding it was time to bring that experience home to Colorado.

How I practice

Plain language first, then the clinical terms once they've been earned. Honest about what the evidence shows and where it runs out. I'd rather say "remission" and mean it than promise more than the data can support. That same standard runs through everything I publish here.

Board certifications

• ABIM — Internal Medicine
• ABIM — Medical Oncology
• ABIM — Hematology
• ABP — Pediatrics

Professional memberships

• American Society of Clinical Oncology (ASCO)
• American Society of Hematology (ASH)