ADRB2 and neoplasm: (3) Results: After analyzing the immunoreactivity of beta 2 adrenoreceptors, we observed increased values in patients with tumors larger than 5 cm in diameter (p = 0.0371), with a deeper degree of tumor invasion T3–4 (p = 0.0159), invasion in more than two lymph nodes (p = 0.0462), or a TNM stage III–IV.