Oncologist in Guatemala
Precise diagnosis. Specialized treatment.
Dr. Reynoso supports patients and families through every stage of the oncology process, with a clinical approach that’s rigorous, clear, and deeply human. Member of ASCO and ESMO.
Oncology: because behind every diagnosis is a person who deserves clear answers.
Receiving a cancer diagnosis changes everything in an instant. Dr. Giovanni Reynoso Lemus has spent more than 8 years supporting patients and their families through that moment — and everything that comes after. A specialist in Medical Oncology trained in Guatemala, Mexico, and Spain, Dr. Reynoso practices in Zona 15, Guatemala City, focusing on the diagnosis and treatment of solid tumors in adults — with chemotherapy, immunotherapy, targeted therapies, and endocrine therapies tailored to the molecular profile of each case. What sets his practice apart isn’t just clinical rigor, but a genuine interest in every patient as a person. In his consultations, there’s time for questions, for understanding the family context, and for building a plan that makes sense for the person who will live it.
My specialty: Solid tumors in adults
As a specialist clinical oncologist, Dr. Giovanni Reynoso offers cancer diagnosis and systemic treatment using the most up-to-date ASCO and ESMO protocols. From lung, breast, and colon cancer to immunotherapy and precision medicine — with the scientific rigor and humanity every case deserves:
Breast Cancer
HER2+ · Luminal · Triple negativeDiagnosis, adjuvant treatment, and advanced disease. Coordination with surgery and radiotherapy.
Lung Cancer
Non-small cell · Small cell · MolecularNon-small cell and small cell. Molecular testing to identify targeted therapies and immunotherapy.
Colon and Rectal Cancer
Localized · Metastatic · MSIEarly and metastatic stages. Management of localized disease through multidisciplinary coordination.
Prostate Cancer
Hormone-sensitive · Castration-resistantCastration-resistant, hormone-sensitive, and high-risk localized disease.
Gastric Cancer
Esophageal · GEJ · StomachEsophageal, gastroesophageal junction, and stomach adenocarcinoma. Specific training in digestive tumors.
Head and Neck Tumors
Squamous cell carcinoma · HPV · RecurrentSquamous cell carcinomas. Coordination with surgery and radiotherapy.
Melanoma and Advanced Skin Cancer
Melanoma · BRAF · ImmunotherapyMetastatic melanoma and immunotherapy. Merkel cell carcinoma and other advanced skin tumors.
* In all cases: molecular testing when applicable, genetic follow-up testing with circulating DNA to confirm remission, tumor board case discussion, coordination with surgery and radiotherapy, and management of toxicities and supportive care.
Your treatment is chosen based on evidence and biology
Treatment decisions are built on a precise diagnosis, tumor board case discussion, and findings from pathology, molecular studies, and your clinical situation. Every plan is designed around your specific needs.
Chemotherapy
Standard and second-line regimens, selected according to up-to-date international oncology guidelines and each patient’s individual response.
Immunotherapy
Checkpoint inhibitors for tumors with a favorable molecular profile, with specialized management of immune-related toxicities.
Targeted Therapies and Precision Medicine
Selection based on biomarkers — HER2, EGFR, BRAF, ALK, KRAS — with circulating DNA (ctDNA) genetic testing available at Bonanova to reassess remission and detect a possible relapse early.
Endocrine Therapies
Hormonal blockade for breast and prostate cancer, with ongoing follow-up and proactive management of long-term toxicities.
Chemotherapy
Standard and second-line regimens, selected according to up-to-date international oncology guidelines and each patient’s individual response.
Immunotherapy
Checkpoint inhibitors for tumors with a favorable molecular profile, with specialized management of immune-related toxicities.
Targeted Therapies and Precision Medicine
Selection based on biomarkers — HER2, EGFR, BRAF, ALK, KRAS — with circulating DNA (ctDNA) genetic testing available at Bonanova to reassess remission and detect a possible relapse early.
Endocrine Therapies
Hormonal blockade for breast and prostate cancer, with ongoing follow-up and proactive management of long-term toxicities.
Received a cancer diagnosis? The next step is a consultation.
First visit, second opinion, or oncologic follow-up — you deserve an oncologist who explains everything.
An independent review, before you decide.
If you already have a diagnosis and a proposed treatment, a technical review can help you make your decision with more information — in coordination with your treating physician.
Send your records
Pathology, imaging, summaries, and proposed treatments once your appointment is scheduled.
Review appointment
We review every finding and every proposed clinical decision together.
Analysis of your case
You receive my technical opinion and, if applicable, alternatives to consider.
What to expect at your visit
Dr. Reynoso sees patients in Guatemala City with a patient- and family-centered approach, taking real time to understand each case and design a treatment plan specific to your tumor type:
Medical History and Complete Case Review
A detailed review of your medical history, imaging studies, biopsies, lab results, and prior treatments. In oncology, understanding exactly what has been done before — and why — is just as important as the current diagnosis.
Diagnostic Evaluation of the Solid Tumor
Review of histological type, molecular markers, staging, and tumor profile. Correctly characterizing the cancer — its origin, subtype, and biology — determines which treatment is most likely to work for that specific case.
Honest Diagnosis and Clear Prognosis
Dr. Reynoso explains precisely what he found, what it means, and what the real picture looks like. Honesty without harshness, clarity without unnecessary jargon. The patient and their family know exactly where they stand.
Treatment Plan Specific to Your Tumor
A treatment protocol designed around tumor type, stage, molecular markers, and the patient’s condition. Chemotherapy, immunotherapy, targeted therapies, or endocrine therapies — always with the best treatment available for that specific diagnosis.
Book your consultation or second opinion
Common questions, clear answers
Still have questions? Let’s talk directly on WhatsApp for personalized answers.