Does Water Irrigation Control Pleomorphic Adenoma Cell Growth Better Than Saline?

Area of Science:

• Oncology
• Surgical Pathology
• Cell Biology

Background:

• Pleomorphic adenoma (PA) is a common salivary gland tumor.
• Recurrence of PA can occur if tumor cells remain in the surgical bed.
• The efficacy of sterile water irrigation in lysing PA cells is anecdotally reported but not scientifically established.

Purpose of the Study:

• To investigate the in vitro effect of sterile water compared to saline on pleomorphic adenoma cell viability.
• To determine if sterile water irrigation can induce PA cell death and inhibit proliferation.

Main Methods:

• Surgically resected PA biospecimens were used to create single-cell suspensions and cell lines.
• PA cells were exposed to sterile water or saline for varying durations (5-15 minutes) and temperatures (26°C, 37°C, 44°C).
• Cell death was assessed by flow cytometry, and proliferation was evaluated by culturing cells post-exposure.

Main Results:

• Exposure to sterile water significantly increased PA cell death compared to saline.
• Water irrigation inhibited the proliferation of PA cells in vitro.
• Increased temperature and duration of water exposure further reduced cell viability in one cell line.

Conclusions:

• In vitro findings support the anecdotal use of sterile water irrigation for reducing PA recurrence.
• Water irrigation may aid in eliminating residual tumor cells in the surgical bed.
• Further clinical studies are warranted to confirm these laboratory findings.