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the new calls for tougher regulations. > the mysterery at sea. what happened to three experienced american sailors who disappeared without a trace off the coast of mexico almost two weeks ago? a new treatment for melanoma brings promising results. rates of recurrence and death down dramatically and ten years after the boston marathon bombing, how their injuries forged a bond that has withstood the test of time, inspiring america. announcer: this is nbc nightly news with lester holt good evening and welcome. an akron, ohio grand jury charging decision in the police shooting death of jayland walker has that city on nervous edge tonight. the grand jury declining to indict eight police officers who fired some 46 bullets into walker, killing him. it happened at the end of a chaotic chase last summer, much of it caught on police dash and body cams walker was black seven of the officers are white. ohio attorney general dave yost today noting the sheer number of sho ....
at the 25-year-old black motorist last june. the state attorney general saying the officers thought walker was reaching for a gun during a chase. will it ignite new protests? breaking news in kansas city. a homeowner charged with two felony counts after he shot a black teenager who rang his doorbell mistakenly. the prosecutor now saying there was a racial component in the case. growing outrage by u.s. allies after the leak by a national guardsman of those top secret documents, and what they reveal about washington s china concerns. a string of massive and worrying chemical explosions acrossss america.. the new calls for tougher regulations. the mystery at sea. what happened to three experienced american sailors who disappeared without a trace off the coast of mexico almost two weeks ago? a new treatment for melanoma brings promising results. rates of recurrence and death down dramatically. and ten years after the boston marathon bombing, how their injuries f ....
Stop the disease. kristen dahlgren reports. reporter: tonight, what may be a watershed moment for fighting cancer. the data were pretty darn impressive. reporter: in a stage 2 clinical trial researchers like dr. jeffrey webber found adding an mrna cancer vaccine to standard treatment reduced the chances for melanoma recurrence or death by 44%. research on the vaccine was started before an mrna vaccine was used for covid. and it works similarly. doctors use a blueprint from a patient s individual tumor to encode a personalized vaccine. so basically turning your own immune system against the cancer. that is absolutely correct. we re going to generate killer cells that are going to seek out and find the tumor and get rid of it. reporter: in 2019 gary keblish got the devastating diagnosis, advanced melanoma. the deadliest form of skin cancer. i feel that i probably would have been one of those ....