What are the key clinical features that should raise suspicion for a bone or soft tissue sarcoma in a patient?

Key clinical features raising suspicion for bone or soft tissue sarcoma include:

• An unexplained lump that is increasing in size, particularly in children and young people, which should prompt consideration of soft tissue sarcoma and urgent ultrasound within 48 hours.
• Persistent or unexplained bone pain in children and young people, which should raise suspicion of bone sarcoma and prompt urgent X-ray within 48 hours.
• In adults, an X-ray suggesting the possibility of bone sarcoma warrants a suspected cancer pathway referral.

These features should be considered alongside any associated symptoms such as weight loss, fever, or night sweats, which may further support the need for urgent referral.