Of those patients who participated in PEGASUS-D FAS clinical trial, patient must sign the informed consent form in order to participate in this extension study.

The medical records of the patients will be reviewed throughout the study.

Of those patients who participated in PEGASUS-D FAS clinical trial, patient must sign the informed consent form in order to participate in this extension study.

• Collection of retrospective cohort data

  1)The medical records from the subject's gastrectomy surgery date to Visit1 will be collected through a questionnaire and by reviewing the medical records of the patient.

• Collection of prospective cohort data

  1. Based on visit 1, if the subjects whose date of gastrectomy surgery date is more than 3 years(36 months) and less than 5 years(60 months), the subject should visit the institution at the time of 5 years(60 months, visit2) after gastrectomy surgery to evaluate data requested at visit2.
  2. The medical records will be accessed and collected from the subject's gastrectomy surgery date up to 5 years(60 months)

Inclusion Criteria:

Among the PEGASUS-D Full Analysis Set (FAS) subjects, those who agree to participate in this clinical trial or those who can collect retrospective cohort data after waiving consent according to the consent waiver criteria

Exclusion Criteria:

A person who, at the discretion of the investigator, is deemed difficult to participate in this clinical trial.