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The most significant individual prognostic factor for those suffering from NSCLC is cancer invasion of regional lymph nodes, which depends on pathomorphological characteristics of the primary disease. Cellular and histological atopy of the changed tissue means good predispositions for an early lymph invasion and lymphonodular metastasizing. The aim of the paper: a standard statistical analysis which includes frequency of the degree of malignant change differentiation, metastasizing in stages N1 and N2 and the statistical dependence of the mentioned variables. Patients and methods: a retrospective analysis covered 331 patients who underwent a surgical procedure after they had been diagnosed with NSCLC and it was also based on the definite pathohistological postresectional results which included the above mentioned characteristics in a descriptive manner. Results: the average age of the total number of patients was 62.69 ± 7.47. Males were more numerous than females (4.7:1). There was a significant statistic correlation between the development of the disease and the age (ch 2 test = 493.65; p&lt; 0.05), as well as a significant difference of age in relation to gender (p&lt; 0.05). G2 stage of the disease was the most frequent, with participation of 58.00%, and there was a significant statistical correlation between developing the disease and the level of differentiation ( ch 2 test= 248.13; p&lt;0.05). The invasion of the node N1 was 44.61% and of N2 4.53%. There was a statistically significant correlation between N1 and N2 metastases and the level of differentiation of cancer (ch 2 test =24.74; p=0.00 vs. ch 2 test = 16.37; p=0.01). Conclusion: the domination of G2 stage and statistically significant correlation between the levels of differentiation and regional lymphonodular invasion.

N1 and N2 metastases frequency depending on the degree of differentiation of non-microcelular lung cancer