This is a phase II, non-blinded, non-inferiority prospective cohort trial of patients with ports (PAC) after a systemic therapy to evaluate the safety and effectiveness of PAC flushes in 3 months intervals. Patients with any type of cancer are eligible. The study will extend 1 year from enrollment of the last patient. Each enrolled patient will have his or her port flushed five times in 3 month intervals.