Dr. Pramod S. Chinder, Director and Head of the Department – Orthopaedic Oncology, HCG Cancer Hospital, K R Road, Bengaluru
Rare doesn’t mean insignificant. Although sarcoma accounts for less than 1% of all adult cancers, it can have life-altering consequences if not detected early. Affecting bones and soft tissues, sarcomas occur across all age groups, including children and adolescents. The disease is uncommon and often mistaken for sports injuries, muscle strains, or harmless growths, diagnosis is frequently delayed until the cancer has progressed.
This is why July, observed as Sarcoma Awareness Month, serves as an important reminder to increase public awareness and encourage earlier diagnosis.
Sarcoma is a cancer that develops in the body’s connective tissues, the tissues that support, protect, and hold the body together. Unlike carcinomas, which arise in the lining of organs such as the lungs, breast, or colon, sarcomas originate in bones, muscles, fat, blood vessels, nerves, tendons, cartilage, and the tissue lining joints. Rather than being a single disease, sarcoma is an umbrella term for more than 70 distinct subtypes, each with unique characteristics and treatment approaches.
Broadly, sarcomas are divided into two categories.
Soft tissue sarcomas arise in muscles, fat, tendons, blood vessels, nerves, and other soft tissues, and can occur almost anywhere in the body, although they are most commonly found in the arms, legs, abdomen, or trunk. Common subtypes include liposarcoma, leiomyosarcoma, and angiosarcoma.
Bone sarcomas, the most common of which is osteosarcoma, begin in the bones and typically affect the long bones of the legs or arms, particularly around the knee. Osteosarcoma is seen most often in children, adolescents, and young adults, although it can occur at any age.
Although rare, sarcoma has a significant impact. It accounts for less than 1% of all adult cancers but approximately 15% of childhood cancers, making it proportionally more common in children than in adults. Thousands of new cases are diagnosed worldwide every year. The disease is so uncommon, many primary care physicians may encounter only a handful of cases or even just one, during their entire careers. This lack of familiarity can contribute to delays in recognizing the disease and referring patients to specialist centres.
One of the greatest challenges with sarcoma is that its symptoms often mimic everyday health problems. A soft tissue sarcoma may initially appear as a painless lump that is mistaken for a muscle knot, sports injury, cyst, or harmless swelling. Bone sarcomas frequently present as persistent pain, especially in children and teenagers, where it may be dismissed as a sports injury or simply “growing pains.” Studies suggest that nearly one in four patients initially receives an incorrect diagnosis, delaying access to appropriate treatment. Since sarcomas often grow quietly without causing obvious symptoms, they may become quite large before they are detected.
Recognizing the warning signs early can make a significant difference. A lump that continues to grow, particularly one larger than about five centimeters or roughly the size of a golf ball should always be evaluated by a healthcare professional, even if it is painless. Persistent bone pain that lasts for weeks, worsens at night, or affects only one limb also deserves prompt medical attention. Other symptoms can include swelling, numbness, restricted movement, unexplained fractures, or discomfort caused by the tumour pressing on nearby nerves, muscles, or organs.
The exact cause of sarcoma remains unknown in most patients, and unlike several common cancers, it is not strongly linked to lifestyle factors. However, certain inherited genetic conditions, including Li-Fraumeni syndrome, Neurofibromatosis Type 1, and Gardner syndrome, are known to increase the risk. Other risk factors include previous radiation therapy for another cancer, Paget’s disease of bone, long-standing lymphedema, and exposure to industrial chemicals such as vinyl chloride, arsenic, and dioxins. Even so, many people diagnosed with sarcoma have no identifiable risk factors, underscoring the importance of paying attention to persistent symptoms rather than relying solely on risk profiles.
Diagnosing sarcoma requires specialized evaluation. Imaging tests such as X-rays, ultrasound, MRI, or CT scans help determine the size and location of a tumour, but a biopsy is essential to confirm the diagnosis and identify the specific subtype. Because treatment differs considerably between the many forms of sarcoma, an accurate diagnosis by experienced pathologists and management by a multidisciplinary team are crucial. Patients treated at dedicated sarcoma centres generally have better outcomes than those managed in non-specialist settings.
Treatment is tailored to the individual patient and depends on the tumour’s size, location, grade, subtype, and stage. Surgery remains the cornerstone of treatment and aims to remove the tumour completely while preserving as much normal tissue and function as possible. Depending on the case, surgery may be combined with radiation therapy to reduce the risk of recurrence or chemotherapy to treat aggressive disease. In recent years, advances in targeted therapies, precision medicine, and immunotherapy have expanded treatment options for certain sarcoma subtypes, offering renewed hope for patients.
Although sarcoma is rare, its impact can be profound if diagnosis is delayed. Increasing awareness among both the public and healthcare professionals is essential to ensuring that suspicious symptoms are investigated promptly.
The message is clear: a lump that keeps growing or pain that refuses to go away should never be ignored. Early diagnosis, specialist care, and timely treatment can make a life-changing difference.