You will be shown an abstract from a research paper, and a corresponding research question. Determine the answer to the research question based on the context provided. Your answer should be one of: "YES", "NO", or "MAYBE".

Context:
(OBJECTIVES) Mediastinal lymph node dissection is an essential component of lung cancer surgery; however, choosing mediastinal lymph nodes stations to be dissected is subjective. We carried out this research to investigate the need for dissection of station 9 lymph nodes during lung cancer surgery.
(METHODS) Patients with primary lung cancer who underwent radical surgery between 2010 and 2014 were retrospectively reviewed. Clinical, pathologic, and prognosis data were obtained and analyzed.
(RESULTS) A total number of 1397 patients were included in this research. The metastasis rate of station 9 was 3.45%, which was significantly lower than other mediastinal stations. This metastasis rate was significantly correlated with pT stage, the lobe where the tumor was located, metastasis status of intrapulmonary lymph nodes, pTNM stage, and most of the other mediastinal lymph node stations. In males or ground glass opacity (GGO) patients, the metastasis of station 9 nodes was more unlikely to occur, even though there was no statistical significance. The staging results of most patients (99.63%) would not be impaired, even if station 9 nodes were not dissected, and the prognostic analysis showed that the metastasis status of station 9 had no significant influence on survival.

Question:
Is routine dissection of the station 9 lymph nodes really necessary for primary lung cancer?

Answer:
NO