Registry Study of Proton Radiotherapy in Lymphoma

This registry study is collecting data on lymphoma patients who receive proton radiation therapy to the chest area (mediastinum). It aims to better understand the long-term benefits of proton therapy, such as reduced harm to the heart, lungs, and breast tissue, compared to standard radiation. **You may be eligible if...** - You have been diagnosed with lymphoma (confirmed by tissue analysis) - You are 18 or older - You need radiation therapy to the chest (mediastinum) - Your doctor believes proton therapy offers benefits over standard photon radiation for your specific case - You consent to sharing your data **You may NOT be eligible if...** - You are under 18 years old - You do not consent to participate or to data sharing Talk to your doctor to see if this trial is right for you.