My family likes being outdoors; hiking, biking and exploring nature. I enjoy reading SciFi, biographies and baking cookies. Dr. Nance is rated as a Distinguished provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). Her top areas of expertise are Acute Hepatic Porphyria (AHP), Porphyria, Von Willebrand Disease (VWD), and Heyde Syndrome.

Robin Obenchain is a Hematologist in Chandler, Arizona. Dr. Obenchain is rated as an Advanced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). Her top areas of expertise are Breast Cancer, Paget Disease of the Breast, Inflammatory Breast Cancer, and Angiosarcoma. Dr. Obenchain is currently accepting new patients.

Dr. Kellogg has practiced with Ironwood Cancer & Research Centers as a partner since 1995. He is a graduate of Wayne State University School of Medicine and completed his residency and fellowship at Wayne State University Affiliated Hospitals. Prior to joining ICRC Dr. Kellogg was an Assistant Professor of Medicine at Wayne State University and the Detroit Medical Center working on the breast cancer service. While at the university, in addition to treating patients Dr. Kellogg was involved in conducting multiple clinical research studies. Dr. Kellogg was also Chief Medical Resident at Detroit Receiving Hospital. Dr Kellogg has been recognized by Phoenix Magazine as Top Doc. Dr. Kellogg is Board Certified in Internal Medicine with Specialty Board Certifications in Medical Oncology and Hematology and maintains an active practice concentrating on all types of adult cancers and blood disorders. Dr. Kellogg is rated as an Advanced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Breast Cancer, B-Cell Lymphoma, Paget Disease of the Breast, and Schnitzler Syndrome.

I enjoy cooking, hiking and travel. Dr. Mahmoud is rated as an Advanced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Melanoma, Bone Tumor, Adult Soft Tissue Sarcoma, Alveolar Soft Part Sarcoma, and Orchiectomy.

Ravi Krishnadasan is an Oncologist in Tucson, Arizona. Dr. Krishnadasan is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Acute Myeloid Leukemia (AML), Acute Myeloblastic Leukemia without Maturation, Childhood Acute Myeloid Leukemia, Bone Marrow Transplant, and Bone Marrow Aspiration. Dr. Krishnadasan is currently accepting new patients.

Joining Ironwood Cancer & Research Centers in 2004, Dr. Shtivelband received his medical degree and PhD in Experimental Hematology in Russia. After Internal Medicine Residency, Dr. Shtivelband received fellowship training in Hematology and Medical Oncology at MD Anderson Cancer Center in Houston, where he stayed for an additional year to participate in experimental research. Treating patients with all kinds of malignancies and benign hematological problems, Dr. Shtivelband has particular interest in developing research programs to bring the newest advances in the field of Oncology and Hematology to our community. Dr. Shtivelband also heads the Ironwood Cancer & Research Center's research program. He is Board Certified in Internal Medicine, Hematology and Medical Oncology. Dr. Shtivelband is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Hemochromatosis, Non-Small Cell Lung Cancer (NSCLC), Plasmacytoma, and Lung Cancer.

Dr. Anita Koszyk-Szewczyk joined Ironwood Cancer & Research Centers in July 2009, after completing her Hematology and Oncology training at Penn State University Hershey Medical Center. Dr.Szewczyk has earned her medical degree at Jagiellonian University Collegium Medicum in Krakow, Poland and Honours Biology at McMaster University Hamilton, Canada. She served as Chief Fellow at Penn State University and her special interests include all forms of adult cancers and hematological disorders with special interest in Breast Cancer. She is originally from Poland and Canada. She is board certified in Internal Medicine, Hematology and Oncology. Dr. Koszyk is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). Her top areas of expertise are Breast Cancer, Paget Disease of the Breast, Childhood Iron Deficiency Anemia, Iron Deficiency Anemia, and Bone Marrow Aspiration.

I enjoy ice hockey, boating, and hiking. When not working, I enjoy spending time with my sons and family. Dr. Erickson is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are ALK-Positive Non-Small Cell Lung Cancer, Lung Adenocarcinoma, Small Cell Lung Cancer (SCLC), Squamous Cell Lung Carcinoma, and Bone Marrow Aspiration.

Dr. DeRoock joined Ironwood Cancer & Research Centers in 2009 after completing residency in Internal Medicine followed by fellowship in Hematology and Oncology at the University of California at Davis. He is a first-generation Panamanian-American fluent in both English and Spanish. He previously earned his medical degree at the University of Arizona. Dr. DeRoock is board certified in Internal Medicine, Hematology and Medical Oncology. He has been active in developing clinical trials for pancreatic cancer and lymphoma, and has presented his research findings at the American Society of Hematology Annual Meeting as well as the Annual Pan-Pacific Lymphoma Conference. He specializes in all adult cancers and hematologic disorders.Supportive Cancer Care You Can TrustYou can find that team at Ironwood Cancer & Research Centers. With community-based centers strategically located throughout the Metro Phoenix area, Ironwood offers advanced therapies and a multi-disciplinary approach usually associated with large academic centers – but with a personalized touch recognizing the individual needs of the patient.Studies have shown the importance of a multi-disciplinary approach in effectively treating cancer. We spare you time and worry simply by having all the doctors, therapists, and resources you need in one convenient location, eliminating the delays and miscommunication. These collaborative efforts ensure the highest standards of care. Because Ironwood is actively involved in cutting-edge research, you can also benefit from promising new treatments through participation in clinical trials. Dr. Deroock is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Pulmonary Embolism, Nodular Lymphocyte-Predominant Hodgkin Lymphoma (NLPHL), Childhood Iron Deficiency Anemia, and Iron Deficiency Anemia.

Maressa Alejandro is a primary care provider, practicing in Family Medicine in Phoenix,, Arizona. Dr. Alejandro is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). Her top areas of expertise are Peripheral Neuropathy, Malignant Otitis Externa, Silent Thyroiditis, Vitamin D Deficiency, and Hormone Replacement Therapy (HRT).

Dr. Cherington joined Ironwood Cancer &  Research Centers in July 2016 after completing his fellowship in Hematology and Medical Oncology at the Mayo clinic.  An Arizona native, he earned undergraduate degrees in Biology and Spanish at Arizona State University prior to attending the University of Arizona for his medical doctorate.  Dr. Cherington has presented research at ASCO and ASH and authored several research articles. However, what he values most is receiving the Gold Humanism Award, which recognizes him as possessing the personal characteristics that colleagues themselves would look for in a physician for themselves or their family members. Early in his youth, Dr. Cherington developed a passion to fight cancer when a childhood friend was diagnosed with a rare brain tumor.  His friend's cancer was aggressive, and her life was ultimately lost, but her tumor cells were donated to research new therapies. Years later, Dr. Cherington spent time at Barrow Neurological Institute investigating cell lines that most likely included his friend's saved cells. The fire that was ignited as a child was further fueled when Dr. Cherington's step-sister lost her life to cancer as a young adult. Today, in each new patient, Dr. Cherington sees a friend or family member who deserves the utmost compassion and expertise that modern medicine has to offer.Outside of work, Dr. Cherington enjoys hiking, exploring Arizona, sports, and spending time with his three children, his dog, and his beautiful wife.  Together, they are passionate about continually moving toward adopting lifestyle factors to prevent or slow cancer.  Dr. Cherington promotes using healthful lifestyle changes in conjunction with the best cancer treatment modern medicine has to offer to continually work towards a cure. Dr. Cherington is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Oligodendroglioma, Astrocytoma, Glioblastoma, and Gliosarcoma.

Dr. Ortiz Cruz joined Ironwood Cancer & Research Center in September 2014, after completing her hematology and medical oncology fellowship at the University of South Carolina in Charleston. She completed two years of research at the National Cancer Institute | National Institutes of Health in Bethesda Maryland where she was involved with clinical research in radiation oncology in addition to work with medical oncology. Dr. Ortiz Cruz also completed an internal medicineresidency training program at Banner Good Samaritan Medical Center in Phoenix. She has published several articles in scientific journals and presented at various meetings. Dr. Cruz's specializes in solid tumor and hematologic disorders with a special interest in breast, colon cancer and lymphoma. Dr. Cruz's goal is to deliver the best care available for her patients by providing personalized treatment planning in conjunction with cutting-edge therapy.Dr. Cruz's personal goal is to deliver the best care available for her patients with the understanding that personalized treatment planning in conjunction with utilizing cutting-edge therapy is the best means to achieve this goal. Dr. Cruz is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). Her top areas of expertise are Breast Cancer, Severe Congenital Neutropenia, Paget Disease of the Breast, and Chronic Familial Neutropenia.

Dr. Sanjeev Gopal is a board certified specialist in Medical Oncology and Hematology.With offices in Apache Junction, Mesa and Gilbert, he is committed to providing highest level of care. Our center provides comprehensive care including Chemotherapy, immunotherapy, biologic therapy and iron infusions. Our goal is to provide individualized care to all Blood and Cancer patientsDo not dwell in past, do not dream of future, concentrate the mind on present moment. Dr. Gopal is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Colorectal Cancer, Familial Colorectal Cancer, Squamous Cell Lung Carcinoma, and Non-Small Cell Lung Cancer (NSCLC).

Ryan Robetorye is a Hematologist in Phoenix, Arizona. Dr. Robetorye is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Acute Myelomonocytic Leukemia, Chronic B-Cell Leukemia (CBCL), Chronic Lymphocytic Leukemia (CLL), and Richter Syndrome.

Kalyan Mantripragada is a Hematologist in Gilbert, Arizona. Dr. Mantripragada is rated as an Advanced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Pulmonary Embolism, Hemochromatosis, Agranulocytosis, Childhood Iron Deficiency Anemia, and Gallbladder Removal.

Allan Morazan is an Internal Medicine provider in Prescott, Arizona. Dr. Morazan is rated as an Advanced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Paget Disease of the Breast, Breast Cancer, Familial Colorectal Cancer, and Colorectal Cancer.

Leslie Padrnos is a Hematologist Oncology specialist and a Hematologist in Phoenix, Arizona. Dr. Padrnos is rated as an Advanced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). Her top areas of expertise are Myeloproliferative Neoplasms (MPN), Thrombocytopenia, Anemia, Bone Marrow Aspiration, and Splenectomy. Dr. Padrnos is currently accepting new patients.

Maqbool Halepota is an Oncologist and a Hematologist in Phoenix, Arizona. Dr. Halepota is rated as an Advanced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Familial Colorectal Cancer, Colorectal Cancer, Thrombocytopenia, Prostate Cancer, and Bone Marrow Aspiration. Dr. Halepota is currently accepting new patients.

Alan Langerak is a Hematologist and an Oncologist in Prescott Valley, Arizona. Dr. Langerak is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Familial Colorectal Cancer, Paget Disease of the Breast, Chronic Lymphocytic Leukemia (CLL), Lung Cancer, and Myringotomy.

Sivamurthy Kyathari is a Hematologist Oncology specialist and an Oncologist in Tucson, Arizona. Dr. Kyathari is rated as an Experienced provider by MediFind in the treatment of Acute Hepatic Porphyria (AHP). His top areas of expertise are Iron Deficiency Anemia, Porphyria Cutanea Tarda, Hemochromatosis, Squamous Cell Lung Carcinoma, and Bone Marrow Aspiration.