The values of cathepsin L obtained in the research conducted by Zhang et al. [50] are as follows: the mean value in patients with ovarian cancer 21.23 ng/ml, in healthy patients 5.59 ng/ml, in advanced ovarian cancer 22.6 ng/ml and at the FIGO stage I-II 19.6 ng/ml. The gene discussed is CTSL; the disease is ovarian cancer.