Cancer patients will be recruited from the Taipei Cancer Center of Taipei Medical University. This study was divided into two phases. The first phase adopted cross-sectional study design with questionnaires to analyze the potential predictors of depressive symptoms among cancer patients. The second stage was adopted experimental study design to explore the effectiveness of nurse navigators in cancer care.

The first phase analyze the potential predictors include the following: socio-demographic characteristics, disease characteristics, lifestyle, perceived benefits, cancer patient' experience with medical service, emotional distress, anxiety, and demoralization.

The second phase will be experimental study.Thus, subjects were randomly sampled and divided into 2 groups: experimental group and control group. Subjects in the experimental group will receive oncology case manager care combined with cancer nurse navigator care, while subjects in the control group will be designed as regular care, which only care with cancer case managers. Both groups will receive long-term follow-up analysis (pre-intervention, post-intervention - 3 months, and 6 months). Outcome measures include the following: perceived benefits, emotional distress, depression and anxiety, demoralization, cancer patient' experience with medical service, and medical report indicators (retention rate, completion rate, survival rate, mortality rate, untreated cancer within 3 months).

Inclusion Criteria:

1. Cancer patients for the first time at the cancer center clinic of the university hospital
2. Older than 20 years old
3. Ability to communicate and read
4. The case voluntarily participated in the study and signed the consent form

Exclusion Criteria:

1. People with mental disorders who have schizophrenia, personality disorder, mental retardation, or organic brain disorder.
2. Patient with brain metastasis.
3. Patients who receive hospice palliative care or other treatment programs.

Eligible patient were randomly assigned by the computer random number generator to either intervention or control group. Several methods were used to maintain the treatment blindly, including segregation of assessment and treatment staff and instructions to patients to avoid discussion of treatment assignment with the independent evaluators.