The goal of this clinical trial is to learn if an artificial intelligence phone application called ASSIST can help patients receiving cancer treatment.

The main question[s] it aims to answer are:

Is ASSIST feasible for patients (meaning can it be used by patients)? Is ASSIST acceptable to patients (meaning do patients like it)?

Researchers will compare the ASSIST phone application to see how it compares to usual clinical care.

Participants on the ASSIST arm will use the ASSIST phone application for 12 weeks, and participants in both groups will complete surveys.

Inclusion Criteria:

1. Age 18 years or older
2. Ability to understand English
3. About to begin definitive systemic treatment (or within 4 weeks of beginning treatment) based upon the oncology treatment intent form for a new diagnosis of breast cancer, colorectal cancer, or lymphoma.
4. Expected treatment duration of at least 12 weeks
5. Own or willing to receive a smartphone

Exclusion Criteria:

1. Cognitive impairment that would interfere with ability to use smartphone application (as assessed by their attending physician)
2. Visual or motor impairment that would prevent smartphone use
3. Expected survival less than 3 months