Medicine as a data science (3)

High-performance medicine: the convergence of human and artificial intelligence

If you want to know the current state of artificial intelligence in medicine, then Eric Topol review in Nature is the article you have to read. A highlighted statement:

There are differences between the prediction metric for a cohort and an individual prediction metric. If a model’s AUC is 0.95, which most would qualify as very accurate,
this reflects how good the model is for predicting an outcome, such as death, for the overall cohort. But most models are essentially classifiers and are not capable of precise prediction at the individual level, so there is still an important dimension of uncertainty.

And this is good summary:

Despite all the promises of AI technology, there are formidable obstacles and pitfalls. The state of AI hype has far exceeded the state of AI science, especially when it pertains to validation and readiness for implementation in patient care. A recent example is IBM Watson Health’s cancer AI algorithm (known as Watson for Oncology). Used by hundreds of hospitals around the world for recommending treatments for patients with cancer, the algorithm was based on a small number of synthetic, nonreal cases with very limited input (real data) of oncologists. Many of the actual output recommendations for treatment were shown to be erroneous, such as suggesting the use of bevacizumab in a patient with severe bleeding, which represents an explicit contraindication and ‘black box’ warning for the drug. This example also highlights the potential for major harm to patients, and thus for medical malpractice, by a flawed algorithm. Instead of a single doctor’s mistake hurting a patient, the potential for a machine algorithm inducing iatrogenic risk is vast. This is all the more reason that systematic debugging, audit, extensive simulation, and validation, along with prospective scrutiny, are required when an AI algorithm is unleashed in clinical practice. It also underscores the need to require more evidence and robust validation to exceed the recent downgrading of FDA regulatory requirements for medical algorithm approval

Therefore, take care when you look at tables like this one:

Prediction	n	AUC	Publication (Reference number)
In-hospital mortality, unplanned readmission, prolonged LOS, final discharge diagnosis	216,221	0.93* 0.75+0.85#	Rajkomar et al.96
All-cause 3–12 month mortality	221,284	0.93^	Avati et al.91
Readmission	1,068	0.78	Shameer et al.106
Sepsis	230,936	0.67	Horng et al.102
Septic shock	16,234	0.83	Henry et al.103
Severe sepsis	203,000	0.85@	Culliton et al.104
Clostridium difficile infection	256,732	0.82++	Oh et al.93
Developing diseases	704,587	range	Miotto et al.97
Diagnosis	18,590	0.96	Yang et al.90
Dementia	76,367	0.91	Cleret de Langavant et al.92
Alzheimer’s Disease ( + amyloid imaging)	273	0.91	Mathotaarachchi et al.98
Mortality after cancer chemotherapy	26,946	0.94	Elfiky et al.95
Disease onset for 133 conditions	298,000	range	Razavian et al.105
Suicide	5,543	0.84	Walsh et al.86
Delirium	18,223	0.68	Wong et al.100

1. LOS, length of stay; n, number of patients (training+ validation datasets). For AUC values:
2. *, in-hospital mortality; + , unplanned readmission; #, prolonged LOS; ^, all patients; @, structured + unstructured data; + +, for University of Michigan site.

In search for a fair price-setting in cancer drugs

Pricing of cancer medicines and its impacts

We all know that new cancer drugs represent a challenge for the whole society. Expectations from drug firms are high and public and private budgets do not increase according to such expectations. A technical report released by WHO sheds light on the issue.
Just one statement:

Overall, the analysis suggests that the costs of R&D and production may bear little or no relationship to how pharmaceutical companies set prices of cancer medicines. Pharmaceutical companies set prices according to their commercial goals, with a focus on extracting the maximum amount that a buyer is willing to pay for a medicine. This pricing approach often makes cancer medicines unaffordable, preventing the full benefit of the medicines from being realized.

You may find here former posts on the same topic.

PS. My comment on genetics in clinical practice in GCS 69, p.96

TATE MODERNEXHIBITION

THE C C LAND EXHIBITION

PIERRE BONNARD

THE COLOUR OF MEMORY

Beyond nudges

Beyond Nudges — When Improving Health Calls for Greater Assertiveness

From NEJM

And a book:

Barbarians at a drug firm

After Enron, Valeant Pharmaceuticals is one of the largest corruption scandals of Wall Street. If you want to know the details, you just have to connect Netflix. In episode 3 of the documentary series Dirty Money, you'll  find The Drug Short episode. You'll understand what happens when barbarians take unethical decisions, although they were legal. Meanwhile, the regulator was on vacation in the US.
Highly recommended.

PS. If you don't have Netflix and you are interested on how to proceed like a Valeant executive in the energy sector, then you have to watch "Enron: the smartest guys in the room".

Incentives and behavior

THE MORAL ECONOMY
WHY GOOD INCENTIVES ARE NO SUBSTITUTE FOR GOOD CITIZENS

For those interested in pay for performance, the book by Samuel Bowles will open their minds to new perspectives. The rationale behind the Homo economicus needs to be adjusted to ethical and altruistic motives, professionalism in other words. This explanation of the prisoner's dilemma is helpful.

In the Prisoner’s Dilemma game, defecting rather than cooperating with one’s partner maximizes a player’s payoff, irrespective of what the other player does. Defecting in this game is what game theorists call a dominant strategy, and the game is extremely simple; it does not take a game theorist to figure this out. So, assuming that people care only about their own payoffs, we would predict that defection would be universal.

But when the game is played with real people, something like half of players typically cooperate rather than defect. Most subjects say that they prefer the mutual cooperation outcome over the higher material payoff they would get by defecting on a cooperator, and they are willing to take a chance that the other player feels the same way (and is willing to take the same chance.

When players defect, it is often not because they are tempted by the higher payoff that they would get, but because they know that the other player might defect, and they hate the idea that their own cooperation would be exploited by the other. We know this from what happens when the Prisoner’s Dilemma is not played simultaneously, as is standard, meaning that each person decides what to do not knowing what the other will do, but instead is played sequentially (one person chosen randomly moves first). In the sequential game, the second mover usually reciprocates the first player’s move, cooperating if the first has done so, and defecting otherwise. Keep in mind the fact that avoiding being a chump appears to be the motive here, not the prospect of a higher payoff. 

Stanton at Galeria Barnadas

The corporatization of medicine

Private Equity Acquisition of Physician Practices

From Annals of Internal Medicine:

The current environment is accelerating the disappearance of independent practices and fueling the corporatization of medicine. Many of the largest practices have already been acquired by a hospital, insurer, or private equity firm. No peer-reviewed evidence examines the effect of private equity acquisitions on the quality and cost of patient care; physician professionalism; or the experience of patients, physicians, or staff; little evidence examines the effect of hospital or insurer acquisitions.

Technology driven disruption in health insurance

Digital is reshaping US health insurance—winners are moving fast

From McKinsey

Digital has begun to reshape health insurance markets. Payers in the United States have been slow to digitize and are still behind other industries in their use of artificial intelligence and automation, as well as in customer satisfaction. They’re now starting to catch up. Both incumbents and disruptors are making substantial and growing investments in digital programs.