Active surveillance in asymptomatic or minimally symptomatic renal cell carcinoma: Retrospective analyses of a cohort of three oncological centers from Spain

441 Background: Some patients (pt) with metastatic renal cell carcinoma (mRCC) have an indolent course. Treatment toxicities can worsen quality of life. Active surveillance (AS) in paucisymptomatic pts is an option often used but few data is available. Our aim is to analyze the impact of initial AS in a sequential therapy strategy in terms of overall survival (OS). Methods: Data frompt diagnosed with mRCC from January 2005 to December 2013 in 3 centres of Spain were retrospectively analyzed. AS subgroup was defined as pt with ≥6 months (m) between diagnosis and first-line (L) treatment (tto) start. A descriptive analysis and median OS (mOS) were performed comparing pt with or without AS (AS vs. tto 1 year from diagnosis to M1, positively. Conclusions: Our results suggest that AS before starting first L of tto is not a detrimental action in a selected population of mRCC pt with good risk characteristics allowing them to remain free of therapy’s toxicity during a long time period.