Some transferred biomolecules include tumor-specific transcripts such as EGFRvIII, echinoderm microtubule-associated protein-like 4 (EML4)-ALK, Kirsten rat sarcoma viral oncogene homolog (KRAS), EGFR, PIK3CA variants, kallikrein-related peptidase (KLK)2, KLK3, and neuropeptide Y (NPY) [13]. The gene discussed is KLK2; the disease is neoplasm.