MKI67 and small cell lung carcinoma: In addition, the proliferation index (Ki-67, median (interquartile range)) in LSC and SCLC (27.45 (11.88, 42.00) and 70.00 (55.13, 73.48), respectively) were both significantly higher than in LAC (10.15 (2.98, 27.89)) (Table 3).