... "with a certain type of genetic alteration in the tumor." This genetic alteration is found in slightly more than 1/3 of patients. I guess "Anti-inflammatory medication for 3 years after colorectal surgery reduces relapse risk for 55% of 38% of patients" doesn't have the same hopeful ring to it, but I'd prefer honesty.
You quoted the first sentence of the article. The headline is not supposed to contain all information from the article. We are not better off with a norm that we refuse to read past the headline and therefore consider the first paragraph of the actual article to be hidden.
I guess intellectual dishonesty in links is so common some people don't even care anymore.