Patient navigation (PN) has been shown to improve rates of cancer screening in vulnerable populations. Most cancer PN programs are located in community health centers and focus on a single cancer. The investigators will evaluate the impact of PN program on breast, cervical, and/or colorectal cancer screening in vulnerable patients receiving care in a large, academic, primary care network using a population-based IT system.

It is important to note that the TopCare system is currently the standard of care in the MGPC-PBRN. As such, this proposal does not involve evaluating the TopCare system or the patients and providers using it. Rather, the study evaluates the part of the TopCare system that involves the automated identification and referral to PN of patients at increased risk of screening non-adherence. All eligible patients overdue for cancer screening tests will receive usual care that includes a reminder letter and referral to a scheduling delegate for follow-up. Since the TopCare system represents usual care for patients with the MGH primary care network, no patient contact will occur solely for research purposes. The study will involve randomly assigning participants overdue for screening and identified as high risk for not completing screening to early or delayed PN. The investigators believe this random assignment is ethical because PN is an extremely limited resource, and all patients in the investigators network identified as high risk for not completing screening could not be contacted by the investigators navigators in a short period of time. Thus, the investigators will randomly assign access to PN during the study period, and then allow all participants to be navigated after the study period is over. As a result, all overdue, high risk patients will be referred for PN, but the timing of the referral will be randomly assigned. In this study, the investigators objectives are to improve the algorithm to automatically identify patients who are more likely to benefit from PN (Specific Aim 1), and to evaluate the clinical impact of PN in a randomized controlled trial within the MGPC-PBRN (Specific Aim 2). Investigators will also survey all patients identified by the TopCare algorithm to assess their overall satisfaction with healthcare to determine whether PN impacts satisfaction with healthcare (Specific Aim 3).

Revising and improving the current 'high risk' algorithm to automatically identify patients who may be helped by PN in Specific Aim 1 will help us to most effectively utilize limited PN resources. The current algorithm utilizes information about patient age, number of overdue tests, primary language, and no-show visit history. The investigators will investigate adding patient registration information about insurance and education status to better identify patients at high risk for not completing screening.

In Specific Aim 2, investigators will randomize eligible patients from the MGPC-PBRN primary care practices to either Arm 1 - TopCare with PN: Patients identified as at high risk for not completing screening by the automated algorithm will be assigned to a PN list for contact to help schedule and complete screening (breast, cervical, and colon), or Arm 2 - TopCare without PN: These patients will benefit from the standard features of the TopCare system, including automated identification of overdue patients, patient reminder letters, and referral to a scheduling delegate. All high risk patients in this arm will be eligible for PN after the study period is over.

Inclusion Criteria:

• Age 21-75
• Seen in MGPC Practices within the Past 3 Years
• Linked to a Specific PCP or to a Specific Practice

Exclusion Criteria:

• A PCP Outside of the MGPC-PBRN network
• Greater Than 75 Years Old
• MGH Chelsea Health Center Patients