3–5 However, both treatment methods have shown a negative effect on patient QoL with significant morbidities impacting urinary, sexual, and bowel function. As a response to

high overdetection rates and the side effects of whole-gland treatment, the strategy of active surveillance (AS) was designed. AS allows for longer observation times with the hope of avoiding unnecessary intervention and the accompanying morbidities. Although this strategy sought to reduce the QoL concerns of whole-gland therapy, it has been demonstrated to increase patient anxiety.6,7 Out of this tenuous balance between AS and whole-gland surgery/radiation has emerged a possible answer in focal therapy. #see more keyword# The goal of focal therapy is to destroy local cancer lesions while minimizing damage Inhibitors,research,lifescience,medical to healthy surrounding tissue. Seeking to be an optimal treatment strategy, focal therapy gives an active treatment option to those not comfortable with surveillance while not exposing them to the potential morbidity profile of whole-gland therapy. It is also an encouraging treatment option because it does not preclude retreatment or whole-gland treatment if the cancer should recur. The most prominent question that remains is whether focal therapy achieves similar cancer control

to whole-gland procedures.8 It is also unclear whether focal treatment can be a true answer Inhibitors,research,lifescience,medical for PCa due to the multifocal nature of the disease. Other concerns exist about the ability of our current imaging and biopsy technologies to allow for a true definition of loci of cancer within the prostate, and how to best monitor patients after focal therapy.9 Two

Inhibitors,research,lifescience,medical main technologies have been used for focal therapy. Inhibitors,research,lifescience,medical Cryoablation has gained popularity as a focal treatment option with the increased precision of the third-generation argonhelium gas platforms.10 This technology is based on the ability to cause the destruction of the cellular membrane through initial freezing and subsequent freeze-thaw cycles. High-intensity focused ultrasound (HIFU) is an alternative to cryoablation that delivers ultrasound waves causing an increase in temperature in target areas resulting in necrosis.11 In addition, a third technology—laser-induced interstitial thermotherapy—is beginning to be investigated for use in focal therapy.12 Both HIFU and cryoablation began as promising alternative methods to whole-gland Adenosine therapy, with the technologies only recently being adapted for use in focal therapy. Both methods have shown positive results for cancer control when used as a whole-gland treatment. Jones and colleagues studied 1198 patients undergoing whole-gland cryoablation with a mean follow-up of 24.4 months and demonstrated a 5-year biochemical disease-free survival (bDFS) of 77% based on the American Society for Therapeutic Radiology and Oncology (ASTRO) criteria.