Osteosarcoma Lung Relapse: What Are the Treatments?

If osteosarcoma spreads (metastasizes) or returns after initial treatment, the lungs are by far the most common place it goes. Hearing that the cancer has returned is emotionally difficult, and seeking a second opinion at a specialized sarcoma center is a very reasonable step to ensure all options are explored.

When routine chest CT scans detect new spots—often called nodules or pulmonary metastases—the multidisciplinary care team will review them carefully. Not every new spot is cancer; some can be scar tissue, inflammation, or an infection. The team will compare current scans to past ones, watch for growth over time, check for disease elsewhere, and sometimes recommend a biopsy to confirm whether the spots are a relapse. If osteosarcoma is confirmed in the lungs, the primary goal is often to safely treat or remove all visible signs of the disease.

Surgical Removal (Metastasectomy)

For osteosarcoma in the lungs, surgery to remove the tumors—called a pulmonary metastasectomy—often offers the best chance of long-term control for carefully selected patients ^[1][2]. Complete removal means no visible tumor remains on scans or during surgery, though it does not completely eliminate the risk of microscopic cancer remaining or guarantee the cancer will not return ^[1].

Surgery is generally considered the best option if:

• The primary bone tumor (the original site of the cancer) is completely controlled ^[1].
• There is no cancer elsewhere in the body that cannot be safely treated ^[1].
• The surgical team believes they can completely remove all the spots in the lungs ^[1][2].
• The patient will have enough healthy lung tissue left to breathe well (adequate pulmonary reserve) after the operation ^[2].

There is no strict rule on exactly how many spots can be safely removed. The decision is highly individualized and depends on the number, size, and exact location of the spots, how fast they are growing, the patient’s general health, and previous treatments ^[3][2].

Types of Surgery

Surgeons may use different approaches, balancing the need to find all tumors with the desire for a smoother recovery:

• Open surgery (Thoracotomy): The surgeon makes a larger incision to directly see and feel the lung tissue. Because osteosarcoma nodules can be hard to spot on scans, a surgeon’s hands can often find tiny tumors that high-resolution CT scans missed ^[4][5]. However, open surgery usually involves more pain and a longer recovery.
• Minimally invasive surgery (Thoracoscopy): Using small incisions and a camera, this approach generally has a faster recovery. It may be appropriate for selected patients, depending on the location of the spots, whether they are on one or both lungs, and the surgeon’s experience ^[5].

What to Expect With Surgery

Lung surgery typically involves a hospital stay of several days. Surgeons often perform a “wedge resection,” removing a small section of tissue around the tumor to spare as much healthy lung as possible. Patients usually wake up with a chest tube to drain fluid and air, and will be guided through breathing exercises to prevent pneumonia and expand the lungs. Recovery time varies, but patients can expect a period of reduced energy and some chest pain that the care team will help manage.

Repeat Surgeries

Because osteosarcoma can recur, spots may return in the lungs even after a successful surgery. If this happens, a second or third metastasectomy can sometimes be performed. Repeat operations can help carefully selected patients achieve long-term disease control, but the decision requires a fresh risk-benefit review because each surgery carries cumulative risks like scarring, air leaks, and loss of lung tissue ^[6][7].

Other Local Treatments

If surgery is not safe or possible, the care team might discuss other ways to treat individual tumors. Options like stereotactic body radiation therapy (highly targeted radiation) or thermal ablation (using heat or cold to destroy the tumor) are sometimes used. While the evidence for these is less established than for surgery, they can be options for symptom control or slowing disease progression when surgery isn’t feasible.

Systemic Therapies (Medications)

Medications that travel through the whole body (systemic therapies) are often used alongside surgery or when complete surgical removal isn’t possible.

• Salvage Regimens: If tumors are growing rapidly or cannot be surgically removed, standard chemotherapy drugs may be used to try to shrink them or pause their growth ^[8][9]. Sometimes, this shrinkage can make an inoperable patient eligible for surgery, though this is not guaranteed ^[8].
• Targeted Therapies: Multikinase inhibitors (such as regorafenib or apatinib) are pills that target specific pathways to slow or stop the growth of the cancer ^[10][11]. They are generally used when standard chemotherapy is no longer working. These drugs can cause significant side effects, including high blood pressure, hand-foot skin reactions, diarrhea, liver problems, bleeding or clotting issues, and impaired wound healing ^[10]. It is critical not to start or stop these drugs around the time of surgery without strict guidance from both your oncology and surgical teams.

The Role of Clinical Trials

When osteosarcoma returns, it is a good idea to ask your care team whether a clinical trial is appropriate for you ^[12]. Trials are voluntary and offer access to investigational treatments, though their benefits and risks are uncertain, and they may require extra visits or travel to a specialized center. Current research focuses on combining targeted drugs with chemotherapy ^[13][14] and new forms of immunotherapy (drugs that help the immune system recognize and attack cancer cells) ^[15]. While standard checkpoint inhibitors (a common type of immunotherapy) have rarely been effective on their own for relapsed osteosarcoma, clinical trials are testing new combinations ^[16].

When to Contact Your Care Team

If you or your child are experiencing a lung relapse or recovering from lung surgery, monitor for new symptoms.

• Contact your oncology team promptly for a new or worsening cough, shortness of breath, persistent chest pain, coughing up small amounts of blood, or a fever.
• Seek urgent or emergency care for severe or sudden breathing difficulty, severe chest pain, fainting, or coughing up significant amounts of blood.