Inclusion Criteria:

• 1. Adult patients with a diagnosis of gynecologic mesonephric-like adenocarcinoma (MLA).
• 2. Patients can also be diagnosed with mesonephric adenocarcinoma (MA) or patients with mesonephric and mesonephric-like carcinosarcomas.
• 3. Patients who are receiving or have received treatment at any facility, including but not limited to MD Anderson Cancer Center are eligible.
• 4. Patients may be residents of any country and be of any ethnic background.
• 5. Patients who request to participate in the registry, regardless of the method by which they learned of it, are eligible to participate.
• 6. Patients who do not speak English can be eligible if accompanied by an institutional interpreter.

Exclusion Criteria:

• 1. Patients with other subtypes of EACs.