For cases in which the entire limb cannot be saved, surgeons make an effort to preserve as much as possible during reconstructive surgery in order to optimize functionality. For example, in a procedure called Van Nes rotationplasty, the surgeon is able to recreate a functioning knee that can withstand vigorous athletic activity. Memorial Sloan-Kettering physicians led studies to create longer-lasting prostheses, such as the ComPreSs implant -- a novel method to secure a knee replacement to the thighbone. For children, we are using specially designed expandable prostheses that "grow" as the child grows, so that a second surgery can usually be avoided later in life.
Cryosurgery (the freezing and killing of cancer cells) is sometimes used in addition to surgery for some bone cancer patients. Memorial Sloan-Kettering surgeons were the first to use cryosurgery in bone tumors, perfecting its use to reduce tumor recurrence while preserving limb and joint function, as well as decreasing the need for amputation. After a bone tumor is removed, liquid nitrogen is used to freeze the tumor cavity to subzero temperatures, killing microscopic tumor cells.
Advanced Imaging Technology
Important in the diagnosis of and follow-up screening for bone cancer is imaging. During diagnosis our radiologists will review imaging tests such as an x-rays which will allow the doctor to see any unusual bone growths. This may be followed by a bone scan, to see if there are other abnormal areas in the skeleton. A computed tomography (CT) or magnetic resonance imaging (MRI) scan is often ordered to show the exact size, shape, and extent of the suspected bone tumor, and to determine if it has invaded surrounding tissue. A positron emission tomography (PET) scan may be used to diagnose bone cancer and is especially useful for identifying metastasis. PET and CT scans can be used in combination to pinpoint the exact location of cancer.
Imaging technology is also used after the initial diagnosis and throughout the course of treatment to reevaluate the tumor size and identify possible metastases or recurrence.
Innovations in Chemotherapy and Radiation Treatments
Using a combination of chemotherapy and/or radiation before or after surgery is a common practice in the treatment of bone cancer. Our pediatric and medical oncologists have developed standard strategies for using chemotherapy to treat bone cancer. For example, a type of treatment called induction chemotherapy -- often administered before surgery to reduce the size of the tumor to make surgery more effective -- was pioneered at Memorial Sloan-Kettering. [PubMed Abstract]
Radiation therapy is also often used in combination with surgery or chemotherapy to destroy tumors or to reduce the size of the tumor. Radiation therapy may also be used to kill remaining cancer cells after surgery, or to treat tumors that cannot be surgically removed.
Research is also underway at Memorial Sloan-Kettering to evaluate intraoperative radiation therapy and brachytherapy, techniques that involve the direct application of radiation to the tumor bed during surgery. We are also evaluating a new method to apply radiation therapy directly to bone cancers. This novel form of radiation therapy -- called image-guided radiation therapy (IGRT) -- targets tumors efficiently, minimizing radiation exposure to surrounding healthy tissue.
Applying Scientific Discoveries to Medical Practice
Memorial Sloan-Kettering investigators are scrutinizing the genetic changes that cause and define bone cancer. This process is helping them to understand why some bone cancers respond more readily to treatment than others. Such knowledge may give doctors the information they need to select the best course of treatment for patients on an individual basis.