Tadalafil augments tumor specific immunity in patients with head and neck squamous cell carcinoma.

ABSTRACT:

Purpose

To determine if phosphodiesterase 5 (PDE5) inhibitors can augment immune function in patients with head and neck cancer through inhibition of myeloid-derived suppressor cells (MDSC).

Experimental design

We performed a randomized, prospective, double blinded, placebo controlled, phase II clinical trial to determine the in vivo effects of systemic PDE5 inhibition on immune function in patients with head and neck squamous cell carcinoma (HNSCC).

Results

Tadalafil augmented immune response, increasing ex vivo T-cell expansion to a mean 2.4-fold increase compared with 1.1-fold in control patients (P = 0.01), reducing peripheral MDSC numbers to mean 0.81-fold change compared with a 1.26-fold change in control patients (P = 0.001), and increasing general immunity as

SUBMITTER: Califano JA 

PROVIDER: S-EPMC4329916 | biostudies-literature | 2015 Jan

REPOSITORIES: biostudies-literature