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UCSF researchers have discovered how a mutation in a gene regulator called the TERT promoter confers “immortality” on tumor cells, enabling the unchecked cell division that powers their aggressive growth.

The circumstances of the Indians' waiver deadline acquisition of star third baseman Josh Donaldson has drawn the ire of multiple teams, including the Red Sox and Yankees, according to a report by The Athletic.

The Red Sox got the last laugh with Sunday night's walk-off win, but the Astros showed they might be the team to beat in the playoffs.

Shohei Ohtani's status set off more "Is it time to trade Trout?" questions. The Halos aren't dealing the best player in baseball, but can they keep him beyond 2020?

The Cubs have been in a tough stretch of scheduled games, and it will continue with Sunday's game against the Nats rescheduled for Thursday.

Blue Jays right fielder Randal Grichuk was forced from Sunday's game and is being checked for a possible concussion after slamming face-first into a chair being held by a security guard while chasing a foul ball.

Mets pitcher Jacob deGrom was scratched from his start against the Philadelphia Phillies on a rainy Sunday in New York. Corey Oswalt started in his place.

Kansas City rookie Jorge Lopez came within three outs of a perfect game in the Royals' 4-1 win over the Minnesota Twins on Saturday night.

On his 109th pitch, New York Mets ace Noah Syndergaard took a line drive off of his chest and exited in the seventh inning against the Philadelphia Phillies.

Royals pitcher Jorge Lopez had a perfect game leading into the ninth inning, but a lead-off walk followed by a hit ended his night at 110 pitches and four strikeouts.

Team captain David Wright believes he will return to the New York Mets this season.

Twins pitcher Ervin Santana, who is 0-1 with an 8.03 ERA this season, had the first of multiple injections in the middle finger of his pitching hand.

A day after waiting through a lengthy rain delay that led to a postponement against the host Washington Nationals, Cubs manager Joe Maddon still isn't sure why Friday night's game wasn't played.

The Pirates' Gregory Polanco has a significant bone bruise in his left knee in addition to a shoulder injury and will miss the rest of the season.

Boston should reach 100 wins this week, but after the defending world champs cut them down to size, all bets are off.

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David Price was not fazed by the Astros' lineup on Friday. That's a key development, given what's on the horizon for the Red Sox.

Yanks manager Aaron Boone said the team "can start to get at least a little bit excited" about Aaron Judge's potential return after seeing him take swings on the field before Friday's game against the Mariners.

Baltimore Orioles rookie pitcher David Hess might miss Saturday's start against Tampa Bay after being hit in the eye while playing catch with a football on Friday at Tropicana Field.

Angels two-way star Shohei Ohtani says he hasn't decided yet whether to have Tommy John surgery but that he plans to finish this season as the designated hitter and hopes to return as a DH next season.