This study is observational, meaning that it does not include any interventions or new treatments. As a result, there may not be an immediate benefit for the patient with gastric cancer.

However, the data collected from this trial can contribute to a better understanding of the factors that affect withdrawal and enrolment rates in gastric cancer clinical trials, and may ultimately lead to improved patient outcomes in the future.

Inclusion Criteria:

• Patient is a minimum of 18 years or older
• Patient has been diagnosed with gastric cancer
• Patient has been self-identified as planning to enroll in an observational clinical study

Exclusion Criteria:

• Patient is breastfeeding or pregnant
• Inability to perform regular electronic reporting
• Patient does not understand, sign, and return consent form

Gastric cancer patients who are actively considering participating in an observational clinical study, but have not yet completed enrollment and randomization.