While celebrating the July Fourth holiday last year on a boat in Tyler, Texas, Dr. Julianne Santarosa received the results from her full-body MRI scan. What she saw put a damper on the festivities.
Radiologists at Prenuvo, which performed the scan, had identified a nodule in her lungs. Santarosa, who works as a spinal access surgeon in Dallas, could see the spot circled as she looked at the images from the patient portal on her phone.
“I was like, unless I swallowed a taco chip, that something should not be there,” she told CNBC in an interview.
Before paying $2,500 for the Prenuvo scan, Santarosa, who was 41 at the time, hadn’t felt any pain in and around her lungs and had no reason to suspect anything specific was wrong. Rather, she’d felt generally off since going through in vitro fertilization and had a gut feeling she should do the scan after seeing a Prenuvo ad on Facebook.
The day after seeing her Prenuvo results, Santarosa had a follow-up CT scan at a local hospital. The nodule was cancerous. She had it removed the following week.
Curious and concerned patients like Santarosa are flooding Prenuvo’s nine clinics in the U.S. and Canada. There’s so much demand that the 5-year-old Silicon Valley-based company has announced 11 more locations opening by 2024, including one in London and another in Sydney.
Kim Kardashian called Prenuvo a “life saving machine” in an August post on Instagram that’s generated more than 3.4 million likes. Actress and model Cindy Crawford is an investor, alongside Google ex-Chairman Eric Schmidt, 23andMe co-founder Anne Wojcicki and Nest Labs founder Tony Fadell. The company raised $70 million late last year in a funding round led by Felicis Ventures.
Prenuvo CEO Andrew Lacy said he wants to help customers understand what’s going on beneath their skin, which his company’s technology can do by identifying more than 500 conditions like cancer, multiple sclerosis and brain aneurysms. As of now, the scans have a limited audience because they aren’t covered by insurers, requiring patients to pay out of pocket.
For Santarosa, the imaging was worth every penny and more. Her cancer was detected early enough that she didn’t need to undergo treatments like chemotherapy or radiation. More importantly, it hadn’t spread to the point that it was life threatening.
“There’s no screening test for this,” Santarosa said. “I would’ve been stage 4. I would’ve figured this out when I was coughing up blood.”
Prenuvo CEO Andrew Lacy
Courtesy of Prenuvo
An MRI, which stands for magnetic resonance imaging, is traditionally used when ordered by a doctor. Interpreting the images is a complex science, and the scan alone can take more than an hour, even if it covers just part of the body.
Prenuvo’s custom MRI machines, which received clearance from the U.S. Food and Drug Administration in 2018, can scan a person’s entire body in about an hour. Once a scan is complete, the images are reviewed by one of the company’s 30 licensed radiologists. Customers usually receive their results back within five to 10 business days.
Waitlists are long. According to Prenuvo’s website, the next available slot for a full-body scan in New York is in March. The same is true for the Los Angeles clinic. In the Dallas suburb of Irving, there’s availability starting in mid-December.
Lacy said the business has spiked as awareness in the past 12 months has grown “incredibly.”
“These days, when people ask me what I do, and I say I work at Prenuvo, it’s ‘Oh, I heard that on this podcast,’ or ‘That influencer talked about it,'” he said.
In addition to full-body scans, Prenuvo offers a head and torso scan for $1,800 and a scan of just the torso for $1,000.
‘Old-fashioned scaling’
Lacy said Prenuvo is working to bring prices down through “old-fashioned scaling.”
Some companies have started offering Prenuvo scans as a perk for employees, which has helped increase access to the technology. Lacy said it works for companies with self-funded insurance plans, because they’re able to customize their offerings while assuming the risks.
Traditional insurance companies are paying attention.
“Over time, that data helps inform insurance companies about whether this should be something that would be covered across the insurance plans that they offer,” Lacy said.
Prenuvo is looking for other ways to lower costs through artificial intelligence and by potentially reducing the durations of the scans even further. Lacy said the cost is directly correlated to the amount of time customers spend in the expensive machines.
Prenuvo MRI machine
Courtesy of Prenuvo
Radiologists are at the core of Prenuvo’s business. That brings its own challenges.
Many radiologists are fighting burnout as an aging population has led to mounting caseloads. Emerging technologies like AI have also discouraged some young physicians from pursuing the practice. By 2034, the U.S. could see an estimated shortage of up to 35,600 radiologists and other specialists, according to a report from the Association of American Medical Colleges.
So far, it’s a problem Prenuvo has managed to avoid.
Lacy said Prenuvo has a backlog of radiologists who want to work for the company. In traditional medicine, radiologists are often diagnosing patients with serious and advanced diseases, so identifying conditions early can be a welcome change, he said.
“When you’re catching stage 1 cancer, what you’re doing will save lives,” Lacy said.
Prenuvo is still in its early days. Medical experts caution that, in addition to the steep price, full-body MRI scans won’t catch everything and aren’t meant to replace targeted screenings like colonoscopies and mammograms.
“It is a tool that your physician and you can use, but it does not replace a full diagnostic examination,” said Dr. Jasnit Makkar, an assistant professor of radiology at Columbia University Medical Center, in an interview. “It is a work in progress.”
Dr. Kimberly Amrami, vice chair of the department of radiology at Mayo Clinic Rochester, said that because of the limitations, patients’ expectations have to be set accordingly. She said it can be challenging to identify lesions in the lungs, for instance, and scanning different body parts like the knee, the pelvis, the breasts and the prostate all require different techniques.
“There’s always a wish to do an exam that’s going to answer every question,” Amrami said in an interview. “It’s just not really the way that it works with MRI in particular, because the way that you evaluate different body parts in different disease states is quite different.”
Prenuvo doesn’t use contrast, a heavy metal that’s injected into the blood vessels, when conducting its scans. Contrast can help radiologists visualize certain conditions better, but there’s controversy surrounding its use, and the company doesn’t want to deter people.
Lacy said Prenuvo’s hardware was designed to do “almost as good a job” as contrast by using other techniques.
“We believe that that’s the best possible solution for screening patients who are at normal risk and asymptomatic,” he said. “If we find something that’s very concerning, oftentimes, we will suggest that the patient gets some type of follow-up dedicated imaging that might involve contrast.”
Amrami said people should consult with their physicians to determine what kind of imaging works best for them.
“There is no one-size-fits-all for MRI,” Amrami said.
A look inside a Prenuvo clinic
Prenuvo’s clinic in New York City, New York.
Courtesy of Prenuvo
Lacy said he was inspired to create Prenuvo after he started to wonder about how his high-stress lifestyle was affecting his body. He previously started an internet search company and helped found a gaming company, among other ventures.
He found a radiologist who was offering an early version of a full-body MRI scan. Lacy said he learned a lot from that experience.
“Although my lifestyle was impacting my health, there was nothing crazy going on,” Lacy said. “I remember just this incredible feeling of peace of mind.”
Prenuvo designed its experience for relaxation. Its New York location has the feel of a cross between a spa and a doctor’s office.
Upon arrival at the clinic, patients are led from a cozy waiting room to a private area where they can change into scrubs and remove their jewelry.
While lying down in the machine, patients are given a pair of headphones and can choose to listen to music or watch TV during the scan.
Dr. Eduardo Dolhun, a family physician in San Francisco, decided to get his first Prenuvo scan more than five years ago after Lacy stopped by his office. He said he was skeptical but intrigued by the technology, so he decided to fly to Vancouver, British Columbia, to try an early version of it.
After going through his results with a Prenuvo radiologist, Dolhun called one of his medical school peers at the Mayo Clinic.
“I think this is going to change medicine,'” Dolhun said, recalling the conversation.
Dolhun said he gets a scan every 18 months or so and recommends it to some of his patients. He still advises them to get screening exams like physicals and mammograms as well.
Silicon Valley executives and financiers publicly opened their wallets in support of President Donald Trump’s 2024 presidential run. The early returns in 2025 aren’t great, to say the least.
Following Trump’s sweeping tariff plan announced Wednesday, the Nasdaq suffered steep consecutive daily drops to finish 10% lower for the week, the index’s worst performance since the beginning of the Covid pandemic in 2020.
The tech industry’s leading CEO’s rushed to contribute to Trump’s inauguration in January and paraded to Washington, D.C., for the event. Since then, it’s been a slog.
The market can always turn around, but economists and investors aren’t optimistic, and concerns are building of a potential recession. The seven most valuable U.S. tech companies lost a combined $1.8 trillion in market cap in two days.
Apple slid 14% for the week, its biggest drop in more than five years. Tesla, led by top Trump adviser Elon Musk, plunged 9.2% and is now down more than 40% for the year. Musk contributed close to $300 million to help propel Trump back to the White House.
Nvidia, Meta and Amazon all suffered double-digit drops for the week. For Amazon, a ninth straight weekly decline marks its longest such losing streak since 2008.
With Wall Street selling out of risky assets on concern that widespread tariff hikes will punish the U.S. and global economy, the fallout has drifted down to the IPO market. Online lender Klarna and ticketing marketplace StubHub delayed their IPOs due to market turbulence, just weeks after filing with the Securities and Exchange Commission, and fintech company Chime is also reportedly delaying its listing.
CoreWeave, a provider of artificial intelligence infrastructure, last week became the first venture-backed company to raise more than $1 billion in a U.S. IPO since 2021. But the company slashed its offering, and trading has been very volatile in its opening days on the market. The stock plunged 12% on Friday, leaving it 17% above its offer price but below the bottom of its initial range.
“You couldn’t create a worse market and macro environment to go public,” said Phil Haslett, co-founder of EquityZen, a platform for investing in private companies. “Way too much turbulence. All flights are grounded until further notice.”
CoreWeave investor Mark Klein of SuRo Capital previously told CNBC that the company could be the first in an “IPO parade.” Now he’s backtracking.
“It appears that the IPO parade has been temporarily halted,” Klein told CNBC by email on Friday. “The current tariff situation has prompted these companies to pause and assess its impact.”
‘Cave rapidly’
During last year’s presidential campaign, prominent venture capitalists like Marc Andreessen backed Trump, expecting that his administration would usher in a boom and eliminate some of the hurdles to startup growth set up by the Biden administration. Andreessen and his partner, Ben Horowitz, said in July that their financial support of the Trump campaign was due to what they called a better “little tech agenda.”
A spokesperson for Andreessen Horowitz declined to comment.
Some techies who supported Trump in the campaign have taken to social media to defend their positions.
Venture capitalist Keith Rabois, a managing director at Khosla Ventures, posted on X on Thursday that “Trump Derangement Syndrome has morphed into Tariff Derangement Syndrome.” He said tariffs aren’t inflationary, are effective at reducing fentanyl imports, and he expects that “most other countries will cave and cave rapidly.”
That was before China’s Finance Ministry said on Friday that it will impose a 34% tariff on all goods imported from the U.S. starting on April 10.
At Sequoia Capital, which is the biggest investor in Klarna, outspoken Trump supporter Shaun Maguire, wrote on X, “The first long-term thinking President of my lifetime,” and said in a separate post that, “The price of stocks says almost nothing about the long term health of an economy.”
However, Allianz Chief Economic Advisor Mohamed El-Erian warned on Friday that Trump’s extensive raft of import tariffs are putting the U.S. economy at risk of recession.
“You’ve had a major repricing of growth prospects, with a recession in the U.S. going up to 50% probability, you’ve seen an increase in inflation expectations, up to 3.5%,” he told CNBC’s Silvia Amaro on the sidelines of the Ambrosetti Forum in Cernobbio, Italy.
Former Microsoft CEOs Bill Gates, left, and Steve Ballmer, center, pose for photos with CEO Satya Nadella during an event celebrating the 50th Anniversary of Microsoft on April 4, 2025 in Redmond, Washington.
Stephen Brashear | Getty Images
Meanwhile, executives at tech’s megacap companies were largely silent this week, and their public relations representatives declined to provide comments about their thinking.
Microsoft CEO Satya Nadella was in the awkward position on Friday of celebrating his company’s 50th anniversary at corporate headquarters in Redmond, Washington. Alongside Microsoft’s prior two CEOs, Bill Gates and Steve Ballmer, Nadella sat down with CNBC’s Andrew Ross Sorkin for a televised interview that was planned well before Trump’s tariff announcement.
When asked about the tariffs at the top of the interview, Nadella effectively dodged the question and avoided expressing his views about whether the new policies will hamper Microsoft’s business.
Ballmer, who was succeeded by Nadella in 2014, acknowledged to Sorkin that “disruption is very hard on people” and that, “as a Microsoft shareholder, this kind of thing is not good.” Ballmer and Gates are two of the 12 wealthiest people in the world thanks to their Microsoft fortunes.
C-suites may not be able to stay quiet for long, especially if the recent turmoil spills into next week.
Lise Buyer, who previously helped guide Google through its IPO and now works as an adviser to companies going public, said there’s no appetite for risk in the market under these conditions. But there is risk that staffers get jittery, and they’ll surely look to their leaders for some reassurance.
“Until markets settle out and we have the opportunity to access valuation levels, public company CEOs should work to calm potentially distressed employees,” Buyer said in an email. “And private company managements should refine plans to get by on dollars already in the treasury.”
— CNBC’s Hayden Field, Jordan Novet, Leslie Picker, Annie Palmer and Samantha Subin contributed to this report.
Elon Musk has been promising investors for about a decade that Tesla’s cars are on the verge of turning into robotaxis, capable of driving themselves cross-country, after one big software update.
That hasn’t happened yet.
What Tesla offers is a sophisticated, but only partially automated, driving system that’s marketed in the U.S. as its Full Self-Driving (Supervised) option, though many Tesla fans refer to it as FSD. In China, Tesla recently changed the system’s name to “intelligent assisted driving.”
Full Self-Driving, as it was previously called, relies on cameras and software to enable features like automatic navigation on highways and city streets, or automatic braking and slowing in response to traffic lights and stop signs.
Tesla owner’s manuals warn users that FSD “is a hands-on feature” that requires them to pay attention to the road at all times. “Keep your hands on the steering wheel at all times, be mindful of road conditions and surrounding traffic,” the manuals say.
But many of Tesla’s customers ignore the fine print and use the system hands-free anyway.
Tesla’s partially automated driving systems have been a source of inspiration for its stalwart fans. But they’ve also caused controversy and concern for public safety after reports of injurious and fatal collisions where Tesla’s standard Autopilot or premium FSD systems were known to be in use.
FSD does a lot of things “amazingly well,” said Guy Mangiamele, a professional test driver for automotive consulting firm AMCI Testing, during a recent long drive in Los Angeles. But he added that “the times that it trips up, you could kill somebody or you could hurt yourself.”
The pressure has never been higher on Tesla to elevate the technology and deliver on Musk’s long-delayed promises.
The Tesla CEO is the wealthiest person in the world and was the biggest financial backer of President Donald Trump’s 2024 campaign. Since Trump’s January inauguration, Musk has been leading the administration’s Department of Government Efficiency effort to drastically slash the federal workforce and government spending.
The DOGE team has been connected to more than 280,000 layoff plans for federal workers and contractors impacting 27 agencies over the last two months, according to data tracked by Challenger Gray, the executive outplacement firm.
Musk’s work with DOGE – along with his frequently incendiary political rhetoric and endorsement of Germany’s far-right, anti-immigrant party AfD – has led to a tremendous backlash against Tesla.
Protests, boycotts and even criminal acts of vandalism have targeted the electric vehicle maker in recent months and led many prospective Tesla customers to turn to other brands. Meanwhile, existing Tesla owners have been trading in their EVs at record levels, according to data from Edmunds.
Tesla’s stock dropped 36% through the first three months of 2025, representing its steepest decline since 2022 and third-biggest slide for any quarter since the EV maker went public in June 2010. Tesla also reported 336,681 vehicle deliveries in the first quarter of 2025, a 13% decline from the same period a year ago.
Product unveilings and a “robotaxi launch” expected from Tesla in Austin, Texas, this year could revitalize investors’ sentiment about the company and hopefully lift its share price, Piper Sandler analysts wrote in a note following the worse-than-expected deliveries report.
On Tesla’s last earnings call, Musk promised investors that Tesla will finally start its driverless ride-hailing service in Austin in June.
To see whether the company’s FSD technology is anywhere close to a robotaxi-ready release, CNBC spent months riding along with Tesla owners who use Full Self-Driving (Supervised) and speaking with automotive safety experts about their impressions.
Auto-tech enthusiast and Tesla owner Chris Lee, host of the YouTube channel EverydayChris, told CNBC that Tesla’s system “definitely has a ways to go, but the fact that it’s able to go from where it was three years ago to today, is insane.”
Many experts, including Telemetry Vice President of Market Research Sam Abuelsamid, remain skeptical. There’s been “no evidence” that FSD is “anywhere close to being ready to be used in an unsupervised form” by June, said Abuelsamid, whose firms specializes in automotive intelligence.
Tesla FSD will “often work really well, particularly in daytime conditions” but then “randomly, in a scenario where it did fine previously, it will fail,” said Abuelsamid, adding that those scenarios can be unpredictable and dangerous.
Watch the video to learn more about the evolution of Tesla’s Full Self-Driving (Supervised) and whether it will be robotaxi-ready this June.
Microsoft owns lots of Nvidia graphics processing units, but it isn’t using them to develop state-of-the-art artificial intelligence models.
There are good reasons for that position, Mustafa Suleyman, the company’s CEO of AI, told CNBC’s Steve Kovach in an interview on Friday. Waiting to build models that are “three or six months behind” offers several advantages, including lower costs and the ability to concentrate on specific use cases, Suleyman said.
It’s “cheaper to give a specific answer once you’ve waited for the first three or six months for the frontier to go first. We call that off-frontier,” he said. “That’s actually our strategy, is to really play a very tight second, given the capital-intensiveness of these models.”
Suleyman made a name for himself as a co-founder of DeepMind, the AI lab that Google bought in 2014, reportedly for $400 million to $650 million. Suleyman arrived at Microsoft last year alongside other employees of the startup Inflection, where he had been CEO.
More than ever, Microsoft counts on relationships with other companies to grow.
It gets AI models from San Francisco startup OpenAI and supplemental computing power from newly public CoreWeave in New Jersey. Microsoft has repeatedly enriched Bing, Windows and other products with OpenAI’s latest systems for writing human-like language and generating images.
Microsoft’s Copilot will gain “memory” to retain key facts about people who repeatedly use the assistant, Suleyman said Friday at an event in Microsoft’s Redmond, Washington, headquarters to commemorate the company’s 50th birthday. That feature came first to OpenAI’s ChatGPT, which has 500 million weekly users.
Through ChatGPT, people can access top-flight large language models such as the o1 reasoning model that takes time before spitting out an answer. OpenAI introduced that capability in September — only weeks later did Microsoft bring a similar capability called Think Deeper to Copilot.
Microsoft occasionally releases open-source small-language models that can run on PCs. They don’t require powerful server GPUs, making them different from OpenAI’s o1.
OpenAI and Microsoft have held a tight relationship shortly after the startup launched its ChatGPT chatbot in late 2022, effectively kicking off the generative AI race. In total, Microsoft has invested $13.75 billion in the startup, but more recently, fissures in the relationship between the two companies have begun to show.
Microsoft added OpenAI to its list of competitors in July 2024, and OpenAI in January announced that it was working with rival cloud provider Oracle on the $500 billion Stargate project. That came after years of OpenAI exclusively relying on Microsoft’s Azure cloud. Despite OpenAI partnering with Oracle, Microsoft in a blog post announced that the startup had “recently made a new, large Azure commitment.”
“Look, it’s absolutely mission-critical that long-term, we are able to do AI self-sufficiently at Microsoft,” Suleyman said. “At the same time, I think about these things over five and 10 year periods. You know, until 2030 at least, we are deeply partnered with OpenAI, who have [had an] enormously successful relationship for us.
Microsoft is focused on building its own AI internally, but the company is not pushing itself to build the most cutting-edge models, Suleyman said.
“We have an incredibly strong AI team, huge amounts of compute, and it’s very important to us that, you know, maybe we don’t develop the absolute frontier, the best model in the world first,” he said. “That’s very, very expensive to do and unnecessary to cause that duplication.”