Mistletoe extract is one of the most common complementary treatments used in Europe. Recent basic studies reported tumor response and survival prolongation in number of treatments with Mistletoe preparations. There are evidence based data for using this drug as side effect reducer when use in combination with chemotherapy regimen treatment. Other clinical data, although not well based is that complementary treatment when used in combination with the common oncology treatment has tumor response effect. Combinations with platinum compound and a third generation cytotoxic agent have been accepted as 'standard of care' for patients with advanced NSCLC. The combination of platinum compound and one of the new agents are associated with response rates of 30-40% and a median survival of 8-11 months for advanced NSCLC patients with good performance status.