CNDP2 and non-small cell lung carcinoma: Stage IIIA(N2) non-small cell lung cancer (NSCLC) consists a heterogeneous group of patients with distinct clinical subsets that can be classified as follows:1) stage IIIA-1/IIIA-2, incidental mediastinal nodal involvement, found either intraoperatively in a single station or in the final pathological examination of the surgical specimen; 2) stage IIIA-3, clinical single station or multistation N2 node(s) involvement documented by computed tomography (CT) and/or positron emission tomography (PET)/CT imaging; and 3) stage IIIA-4, bulky or fixed cN2 involvement identified at imaging [1].