NuGa (Nutrition for Gastric Cancer Patients)

• A total of 4 visits will be performed.
• At the screening visit,subject's written informed consent, assessing the inclusion/exclusion criteria and assigning enrollment numbers to eligible subjects, demographic information taking, medical history/medication history taking, vital signs measuring, physical examination, height and body weight measuring, instructing how to install/use the investigational device, and administering quality of life questionnaires.
• During the treatment period, a total of 3 visits will be performed. To evaluate feasibility and efficacy, the following procedures will be carried out: vital signs measuring, physical examination, nutrition assessment/consultation, evaluation of feasibility for 'subjects', evaluation of feasibility for 'investigators', and adverse events (AEs)/concomitant medications checking and collecting.
• During the treatment period, telephone monitoring is conducted depending on the compliance of subjects.

Inclusion criteria

• Patient who voluntarily signs the informed consent form for this study
• Age of ≥19 years old
• Patient who has undergone therapeutic gastrectomy after a diagnosis of gastric cancer
• Able to eat food orally after gastrectomy
• Patient who possesses an Android OS based mobile device and is capable of using the investigational device.

Exclusion criteria

• Other cancer or metastasis documented within 5 years prior to screening
• Ongoing or planned enteral tube feeding or total parenteral nutrition
• Other clinically significant medical or psychiatric findings based on which the individual is considered by the investigator to be ineligible
• Individual who possesses a mobile device on which the application is unable to be installed and/or run normally for technical reasons
• Individual who, in the opinion of the investigator, has difficulty understanding how to use the investigational device or is unlikely to comply with other study procedures