## Cancel

`StudyCancelResponse viewer().studies().cancel(StudyCancelParamsparams = StudyCancelParams.none(), RequestOptionsrequestOptions = RequestOptions.none())`

**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 params`

  - `Optional<String> studyId`

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

  - `Optional<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

  - `boolean success`

  - `Optional<String> message`

### Example

```java
package com.avara.example;

import com.avara.client.AvaraClient;
import com.avara.client.okhttp.AvaraOkHttpClient;
import com.avara.models.viewer.studies.StudyCancelParams;
import com.avara.models.viewer.studies.StudyCancelResponse;

public final class Main {
    private Main() {}

    public static void main(String[] args) {
        AvaraClient client = AvaraOkHttpClient.fromEnv();

        StudyCancelResponse response = client.viewer().studies().cancel();
    }
}
```