This study looks at how different methods help in treating **germ cell tumors** in children and adults. Germ cell tumors are a type of cancer that can spread from the original organ to other parts of the body, called **metastatic tumors**. The study checks if watching patients closely after surgery, instead of immediate treatment, can work for low-risk tumors. It also compares two chemotherapy drugs: **carboplatin** and **cisplatin**, to see which is better for treating standard-risk tumors.
**Key Points:**
- Participation may require regular check-ups with imaging and blood tests for up to 10 years.
- Some patients will receive treatments every 21 days up to 4 cycles, which may include chemotherapy drugs.
- There may be side effects such as hearing issues, which will be closely monitored.
To join, patients need to meet certain criteria like age limits and specific tumor characteristics. They must also have good organ function if they need chemotherapy. Pregnant or breastfeeding women and those not using contraception during the study cannot participate.