Colorectal Cancer

Commonly Asked Questions
Common signs and symptoms of colorectal cancer include blood in the stool, narrow or ribbon-like stools, abdominal cramping or pain, fatigue, and losing weight without trying. Some of these can also be caused by other digestive diseases, such as inflammatory bowel disease (IBD).
The American Cancer Society recommends that people at average risk of colorectal cancer start getting screened at age 45. Your doctor can advise you on which kind of test is right for you and how often to get one.
Colorectal cancer can be caught early, which is why it’s important to get screened for the disease before you develop symptoms. The five-year survival rate for cancers that have not spread beyond the colon or rectum is approximately 90 percent.

Tawee Tanvetyanon
Medical Reviewer
Tawee Tanvetyanon, MD, MPH, is a professor of oncologic sciences and senior member at H. Lee Moffitt Cancer Center and Morsani College of Medicine at the University of South Florida in Tampa. He is a practicing medical oncologist specializing in lung cancer, thymic malignancy, and mesothelioma.
A physician manager of lung cancer screening program, he also serves as a faculty panelist for NCCN (National Comprehensive Cancer Network) guidelines in non-small cell lung cancer, mesothelioma, thymoma, and smoking cessation. To date, he has authored or coauthored over 100 biomedical publications indexed by Pubmed.

Lynn Grieger, RDN, CDCES
Medical Reviewer
Lynn Grieger is a registered dietitian-nutritionist, certified diabetes care and education specialist, certified personal trainer, and certified health and wellness coach. She completed requirements to become a registered dietitian at Valparaiso University in 1987 and completed a dietetic internship at Ingalls Memorial Hospital in Harvey, Illinois, in 1988.
Lynn brings her expertise in nutrition, exercise, and behavior change to her work in helping people reach their individual health and fitness goals. In addition to writing for Everyday Health, she has also written for websites and publications like Food and Health Communications, Today's Dietitian, iVillage.com, and Rodale Press. She has a passion for healthy, nutrient-dense, great-tasting food and for being outdoors as much as possible — she can often be found running or hiking, and has completed a marathon in every state.

Ira Daniel Breite, MD
Medical Reviewer
Ira Daniel Breite, MD, is a board-certified internist and gastroenterologist. He is an associate professor at the Icahn School of Medicine at Mount Sinai, where he also sees patients and helps run an ambulatory surgery center.
Dr. Breite divides his time between technical procedures, reading about new topics, and helping patients with some of their most intimate problems. He finds the deepest fulfillment in the long-term relationships he develops and is thrilled when a patient with irritable bowel syndrome or inflammatory bowel disease improves on the regimen he worked with them to create.
Breite went to Albert Einstein College of Medicine for medical school, followed by a residency at NYU and Bellevue Hospital and a gastroenterology fellowship at Memorial Sloan Kettering Cancer Center. Working in city hospitals helped him become resourceful and taught him how to interact with people from different backgrounds.

Walter Tsang, MD
Medical Reviewer
Outside of his busy clinical practice, Tsang has taught various courses at UCLA Center for East West Medicine, Loma Linda University, and California University of Science and Medicine. He is passionate about health education and started an online seminar program to teach cancer survivors about nutrition, exercise, stress management, sleep health, and complementary healing methods. Over the years, he has given many presentations on integrative oncology and lifestyle medicine at community events. In addition, he was the founding co-chair of a lifestyle medicine cancer interest group, which promoted integrative medicine education and collaborations among oncology professionals.
Tsang is an active member of American Society of Clinical Oncology, Society for Integrative Oncology, and American College of Lifestyle Medicine. He currently practices at several locations in Southern California. His goal is to transform cancer care in the community, making it more integrative, person-centered, cost-effective and sustainable for the future.

Nimit Sudan, MD
Medical Reviewer
Nimit Sudan, MD, is a hematologist and medical oncologist with UCLA. He is an assistant clinical professor at UCLA and serves as a lead physician at the Encino community practice. He has a special interest in integrative medicine and oncology.
Dr. Sudan provides comprehensive care for adult patients with all types of hematologic and oncologic conditions. His mission is to treat every patient with the utmost compassion and care, and to develop a strong doctor-patient relationship. He is passionate about patient and family education, and educating larger communities on cancer awareness and prevention. He also has a special interest in integrative medicine, and is certified in acupuncture.
Sudan is from the Midwest, and received both his medical degree and bachelor's degree from Wayne State University in Detroit, Michigan. He completed his internal medicine residency at the Cleveland Clinic Foundation, and his hematology/oncology fellowship at Western Pennsylvania Hospital in Pittsburgh.

Thomas Urban Marron, MD, PhD
Medical Reviewer
Dr. Marron received his bachelor's degree in human biology from the University of Virginia in Charlottesville in 2005, his PhD in immunology from the Icahn School of Medicine in 2010, and his MD from the Icahn School of Medicine in 2012. He remained at Mount Sinai Hospital for his internal medicine residency, which he completed in 2014, and for his clinical fellowships in hematology and medical oncology, which he completed in 2017.

Conor Steuer, MD
Medical Reviewer
Conor E. Steuer, MD, is medical oncologist specializing in the care of aerodigestive cancers, mesothelioma, and thymic malignancies and an assistant professor in the department of hematology and medical oncology at the Emory University School of Medicine in Atlanta. He joined the clinical staff at Emory's Winship Cancer Institute as a practicing physician in July 2015. He currently serves as chair of the Lung and Aerodigestive Malignancies Working Group and is a member of the Discovery and Developmental Therapeutics Research Program at Winship.
Dr. Steuer received his medical degree from the New York University School of Medicine in 2009. He completed his postdoctoral training as a fellow in the department of hematology and medical oncology at the Emory University School of Medicine, where he was chief fellow in his final year.
He has been active in research including in clinical trial development, database analyses, and investigation of molecular biomarkers. He is interested in investigating the molecular biology and genomics of thoracic and head and neck tumors in order to be able to further the care of these patient populations. Additionally, he has taken an interest in utilizing national databases to perform clinical outcomes research, as well as further investigate rare forms of thoracic cancers.
Steuer's work has been published in many leading journals, such as Cancer, the Journal of Thoracic Oncology, and Lung Cancer, and has been presented at multiple international conferences.

Daniel Landau, MD
Medical Reviewer
Daniel Landau, MD, is a distinguished board-certified hematologist-oncologist with a career that has spanned two eminent institutions: the Orlando Health Cancer Institute and the Medical University of South Carolina. With a specialized interest in genitourinary oncology and hematology, he has been at the forefront of managing both benign and malignant conditions.
Dr. Landau is a pioneering figure in integrating advanced technology into oncology, having served as a director of telemedicine services. Under his leadership, multiple innovative systems have been designed and piloted, all with a singular focus: enhancing the patient experience.
Beyond his clinical and technological endeavors, Landau is deeply committed to medical education. He has dedicated significant time and expertise to nurturing the skills of medical students, residents, and fellows, ensuring that the flame of knowledge and compassion burns bright in the next generation of oncologists.

Ryland J. Gore, MD, MPH
Medical Reviewer
In addition to her professional responsibilities, Gore previously served on the board of directors for Every Woman Works, an Atlanta-based nonprofit organization whose mission is to empower women and help them transition into independence and stability from common setbacks. Gore served as the chairwoman of the American Cancer Society’s Making Strides Against Breast Cancer campaign in Atlanta for three years (2019 to 2021). She is currently the co-director of Nth Dimensions’ Strategic Mentoring Program and the alumni board chair of the Summer Health Professions Educational Program (SHPEP), which is a collaborative effort by the Robert Wood Johnson Foundation, Association of American Medical Colleges, and the American Dental Education Association.
Gore is a highly sought after speaker, consultant, and lecturer on breast cancer and breast health, as well as women’s empowerment topics.
- Colorectal Cancer Risk Factors. American Cancer Society. January 29, 2024.
- Treating Colorectal Cancer. American Cancer Society.
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