<s>[INST] There is currently no effective treatment for a particular rare disease. Researchers use a new drug in a clinical trial to test if it effectively reduces symptoms of the disease, and they recruit 20 participants who are suffering from this disease. The clinical trial lasts for 6 months and consists of two stages: (a) a 2-month controlled period during which participants are randomly divided into a treatment group and a control group; and (b) a 4-month open-label period during which all participants are given the new drug.

Here are the results of the clinical trial: the sum of the pre-trial symptoms of the treatment group ($T$) is 180 and the sum of the pre-trial symptoms of the control group ($C$) is 200. At the end of stage (a) (i.e., after 2 months), the sum of the symptoms of the treatment group ($T_2$) is 120 and for the control group ($C_2$) is 220. At the end of the clinical trial (i.e., after 6 months), the sum of the symptoms of all the participants ($T_6$ and $C_6$ combined) is 150.

What can be deduced about the effectiveness of the new drug in this clinical trial?[/INST]