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Dennis Rousseau, MD

Dr. Dennis L. Rousseau Jr., MD/PhD, FACS is a fellowship trained Surgical Oncologist who completed his general surgery training at the University of Michigan. Dr. Rousseau also completed a surgical oncology fellowship at M.D. Anderson Cancer Center, where he graduated the program in 2003 as the outstanding clinical fellow. He specializes in the surgical treatment of complex gastrointestinal malignancies including disease in the pancreas, liver, biliary tract, stomach, small bowel, colon, and rectum. He also has expertise in the treatment of breast disease, skin and soft tissue malignancy, and endocrine tumors. He is the Associate Medical Director of Cancer Services in the Baptist Health System in San Antonio, where he also serves as the Medical Director of the Gastrointestinal Cancer Center and Associate Medical Director of the Breast Center.

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Surgical Oncology Associates (SOA) is a compassionate and dedicated team comprised of highly skilled surgeons, a nurse practitioner, and other key support staff that are cancer treatment experts with over 45 years of experience in the surgical treatment and prevention of cancer.

The surgeons of Surgical Oncology Associates are expertly trained and have many years of experience in performing a wide array of procedures that address many different types of cancer and precancerous conditions. If you or a loved one is facing cancer and requires surgery, it would be our privilege to provide care.

Patients at High Risk for Cancer

We evaluate and treat individuals with strong family history of cancer and those with genetic changes that result in significantly increased risk for the development of breast and intestinal cancer. We provided personalized approach to care to help patients navigate through complex decision-making.

Specialized Services

The removal of many cancers requires sophisticated complex surgical procedures. Surgical Oncology Associates of South Texas performs state-of-the-art procedures, including sentinel node biopsy for breast cancer and melanoma and radiofrequency ablation for liver tumors, as well as advanced laparoscopic surgery for cancer when indicated. In addition, we believe patients benefit from having two or more specialty trained cancer surgeons in the operating room.

Breast Cancer and Disease

We are experts in the management of breast cancer, in-situ (pre-cancerous) conditions and the surgical prevention of breast cancer in patients who are at increased risk for the development of breast cancer. We work closely with mammographers, pathologists, medical and radiation oncologists, and plastic surgeons to develop a personalized treatment plan. Our practice is dedicated to reducing cancer risk in patients who have an inherited breast cancer syndrome like BRCA 1 and 2. In addition to learning these specialized surgical techniques, a gynecologic oncologist is trained to provide chemotherapy and comprehensive oncology care to a woman throughout the course of cancer treatment.

Colon and Rectal Cancer

We treat cancerous and precancerous growths in the colon and rectum. Rectal cancer requires experts from multiple specialties including surgical oncology, medical oncology and radiation oncology and we work very closely with these other specialists to plan a personalized approach to each patient's care. We are recognized experts in the diagnosis and management of inherited colon cancer syndromes such as Familial Adenomatous Polyposis (FAP) and Hereditary NonPolyposis Colon Cancer Syndrome (HNPCC) or Lynch Syndrome that result in increased risk of colon cancer.

We are frequently referred patients who are discovered to have polyps (growths) and other masses in the colon or who have inflammatory conditions (inflammatory bowel disease) such as Crohns’ Disease and Ulcerative Colitis that puts them at increased risk for the development of future colon cancer risk. We are experts in the diagnosis and management of inherited syndromes such as Familial Adenomatous Polyposis (FAP) and Hereditary NonPolyposis Colon Cancer Syndrome (HNPCC) or Lynch Syndrome that result in increased risk of colon cancer.

Pancreas and Bile Duct Tumors

We treat pancreas and bile duct cancer, pre-cancerous tumors including cysts as well as neuroendocrine tumors. Treatment planning is dependent upon the expert input from several specialists, including gastroenterologists, medical oncologists, and radiation oncologists. With our extensive background, we not only provide expert surgical care, but we also help serve as the coordinators of overall care.

Liver Cancer

We specialize in liver cancer (hepatocellular cancer), cancers that have metastasized to the liver, and non-cancerous and pre-cancerous liver masses. There are several surgical options for the treatment of these tumors including resection, and radiofrequency ablation, as well as several non-surgical options including chemoembolization and radiation. Thus, treatment decisions are complex and we provide a thorough multidisciplinary approach to the management of these tumors.

Stomach and Small Bowel Tumors

We offer surgical treatment of stomach tumors, including gastric cancer and gastrointestinal stromal tumors (GIST), as well as tumors of the small intestine. The management of gastric cancer requires experts from medical oncology and radiation oncology and we work closely with them to offer a multidisciplinary approach. Tumors of the small intestine are rare and usually require surgical treatment.

Skin Cancer (Melanoma)

The most effective treatment for melanoma and other skin tumors is surgical removal with a generous border of normal skin to help prevent local recurrences. Melanoma and other skin cancers can spread to glands called lymph nodes and we are experts in localizing and excising these using a technique called sentinel lymph node biopsy.

Sarcomas (Soft Tissue Tumors)

Soft tissue is present immediately underneath the skin and in various other areas of the body. While soft tissue tumors are not always cancerous, effective treatment of muscle and soft tissue tumors requires surgical resection.

Thyroid and Adrenal Gland Tumors

Not all growths in the thyroid or adrenal gland are cancerous, and the removal of these growths may be required to diagnose cancer. We work closely with leading endocrinologists to ensure expert personalized treatment planning.

Anal Cancer

A rare form of cancer, whose effective treatment requires an accurate diagnosis and close communication between medical oncologists, radiation oncologists and a surgical oncologists.

Other Services:

  • Genetic Testing
  • Inherited Cancer Syndromes and Prophylactic Surgery for High Risk Patients
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