## Cancel

`StudyCancelResponse Viewer.Studies.Cancel(StudyCancelParams?parameters, CancellationTokencancellationToken = default)`

**post** `/v1/viewer/studies/cancel`

Marks a study as cancelled. Cancelled studies are preserved but flagged as inactive. Can be identified by either study ID or DICOM Study Instance UID.

### Parameters

- `StudyCancelParams parameters`

  - `string studyID`

    Unique study identifier. Format: stu_{32-hex-chars}

  - `string studyInstanceUid`

    DICOM Study Instance UID. Must be a valid DICOM UID format (e.g., '1.2.840.10008.5.1.4.1.1.2')

### Returns

- `class StudyCancelResponse:`

  Response for cancelling a study in Viewer

  - `required Boolean Success`

  - `string Message`

### Example

```csharp
StudyCancelParams parameters = new();

var response = await client.Viewer.Studies.Cancel(parameters);

Console.WriteLine(response);
```