Blood type A is generally associated with a higher risk of leukemia, especially certain types like acute leukemia, while blood type O seems to offer some protection, particularly against acute leukemia, though findings vary by leukemia subtype and population. Some studies also link AB blood group to increased risk for specific conditions like Acute Lymphoblastic Leukemia (ALL).
Previous studies confirmed that CLL patients' most common blood group is the A group, but other studies show that blood group O is predominant. Regarding CML cases, the studies found that the most predominant blood group in CML patients is the O and B blood groups.
Conclusions: Blood group A is associated with increased risk of cancer, and blood group O is associated with decreased risk of cancer.
It has been found that those with blood group A are more likely to get gastric, pancreatic, breast, ovarian, and naso- pharyngeal cancers, whereas those with blood group O have a lower chance of developing most cancers (13, 15).
The largest meta-analysis to date, conducted by Bahardoust et al., analyzed 413,132 patients across 14 studies and confirmed that A blood group increases CRC risk while O blood group provides protection [10].
According to the American Heart Association, A, B, and AB blood types are associated with a greater risk of heart attack due to coronary artery disease than type O blood. In particular, people with AB blood appear to have the highest risk.
Blood type O negative (O-) is the universal donor. This means that a person with any other blood type can safely receive your blood. It doesn't contain any antigen markers that other blood types recognize as not belonging. Providers use type O negative blood the most in emergencies when someone needs blood fast.
Indeed, the authors retrospectively reviewed blood group distribution in a cohort of patients stratified by decade of death and found that patients with group B blood had an overall decreased survival (p<0.01) compared with patients with the other blood groups.
Cancer mortality in the overall study population
Asian individuals had the lowest cancer death rates across every age group (15.9, 146.7, and 613.0 per 100 000, respectively).
Of the eight main blood types, people with Type O have the lowest risk for heart attacks and blood clots in the legs and lungs. This may be because people with other blood types have higher levels of certain clotting factors, which are proteins that cause blood to coagulate (solidify).
Acute Myeloid Leukemia (AML) Acute myeloid leukemia (AML) is a rare cancer that affects your bone marrow and blood. It's an aggressive cancer that, left untreated, may be life-threatening. AML typically affects people age 60 and older, but it can affect younger adults and children.
Blood type AB is associated with an increased risk of stroke that is not attenuated by conventional stroke risk factors and factor VIII levels were associated with 60% of the association.
Blood type B is found in a much higher percentage (four times as often) in self-made millionaires than in the rest of the population.
Leukemia is caused by DNA mutations in blood cells, leading to uncontrolled growth, but the exact trigger for these mutations is often unknown, likely a mix of genetic and environmental factors like radiation, benzene exposure, certain viruses, and inherited conditions (e.g., Down Syndrome). These genetic changes tell cells to keep multiplying instead of dying, crowding out healthy cells in the bone marrow.
In a survey of German doctors aged >75 years, group O appeared to be associated with longer life expectancy9. Findings of two studies performed on centenarians were contradictory. Blood type B was observed more frequently in 269 Japanese centenarians (29.4%) than in controls (21.9%)10.
Although there is no proven correlation between blood type and personality, many matchmaking services use it.
About 90% of cancers are caused by environmental and lifestyle factors, not genetics, including smoking, poor diet (red meat, fried foods), alcohol, sun exposure, pollutants, infections, obesity, and inactivity; only 5–10% are due to inherited genetic defects, with most cancers arising from lifestyle-induced genetic mutations. Tobacco alone accounts for about a third of cancer deaths, while diet, obesity, and inactivity contribute significantly, with controllable factors being key to prevention.
Countries with the highest cancer rates in 2025 include Australia, New Zealand, and Denmark. Nations with the lowest cancer rates in 2025 are Niger, Gambia, Nepal, and Bhutan. Understanding global cancer trends is key to better healthcare.
White people had the highest rate of new cancers at 437 per 100,000 people, followed by Black people at 427 per 100,000 people, while cancer incidence rates were lower among Hispanic, Asian and Pacific Islander, and AIAN people.
Resource Links. Bloomberg Several studies have now shown that people with blood type O are less susceptible to contracting Covid, and those with blood type A are more likely to get it. In the early days of the pandemic, those findings were hotly debated.
An AB personality's negative traits can include being self-centered, irresponsible, vulnerable, indecisive, forgetful, unforgiving, and critical. Famous people with AB blood types include Barack Obama, Marilyn Monroe, Jackie Chan, and John F. Kennedy.
The study, which looked at more than 400,000 people, found that types A and B were 50 percent more likely to develop blood clots in the legs called deep vein thrombosis and 47 percent more likely to develop a pulmonary embolism — when a clot travels to the lungs — than people with type O blood.
While the Bible doesn't mention Jesus's blood type, scientific analysis of relics linked to him, like the Shroud of Turin and Eucharistic miracle samples, consistently shows Type AB blood, a rare type, leading some to believe it's a miraculous sign, though skeptics point to potential bacterial contamination.
11.11% males with B+ blood group have normal skin type and 30.73% females with B+ have normal skin. 0% males with B+ have combination skin. 20.40% females with B+ have combination skin. 0% males with B- have oily, combination skin and 50% males have dry and 50% males have normal skin.
This makes O type Rh null blood extremely valuable, as the majority of people can receive it, including individuals with all variants of ABO. In emergencies where a patient's blood type is not known, O type Rh null blood could be given with a low risk of allergic reaction.