The Truth: Cancer is a genetic disease resulting from a variety of mutations and alterations either inherited from our parents or, more commonly, acquired over time due to environmental exposures and behaviors, such as smoking and poor diet. These alterations turn off important cell growth regulators allowing cells to continually divide unchecked, explains Luis Diaz, a clinician-scientist in Ludwig Center for Cancer Genetics at the Kimmel Cancer Center at Johns Hopkins. This type of cell is called a malignant or cancer cell. Among the trillions of cells in the human body, inevitably everyone has some abnormal or atypical cells that possess some of the characteristics of cancer cells, most resolve themselves and never result in cancer, says Diaz.
There is no single or standard test for cancer. There are ways to screen for certain cancers with tests such as colonoscopy for colon cancer, mammography for breast cancer, PSA for prostate cancer, and the Pap smear for cervical cancer, and these tests can detect cancers in a very early and curable stage. For many cancers, there currently are no screening tests, and they are diagnosed when they begin to cause symptoms.
Diaz and other Kimmel Cancer Center researchers are working on new tests that detect abnormal DNA shed by cancer cells into blood and body fluids and have the ability to find cancers before they cause any symptoms. Approaches like this could lead to a broad-based screening test for cancer.
Tests like these also are being used to detect cancer recurrences and malignant cells left behind following surgery, and can find cancers that are not detectable under the microscope or in x-rays.
Other researchers are studying cancer stem cells. They are stealth cells that make up just a tiny fraction of a tumor. While small in number, investigators believe they may be the cells that drive certain cancers and lead to cancer recurrence. Therapies that target these cells are now being tested in clinical trials.
A team of our breast cancer researchers has developed a method that could make it possible to detect breast cancer from the DNA contained in a single drop of blood.
But, while evasive cancer cells are a challenge and the focus of ongoing research, it does not mean, as the email contends, that all patients, even those treated successfully for cancer, have cancers-in-waiting—undetectable but still there. People are treated and completely cured of cancer everyday.
The Truth: When it comes to cancer and the immune system, it is not a matter of strong or weak as the fictional report contends, but rather an issue of recognition. "The immune system simply does not recognize cancer. In its complexity, the cancer cell has learned to disguise itself to the immune system as a normal, healthy cell. Cells infected with viruses or bacteria send out danger signals setting the immune system in action. But cancer cells do not, explains Elizabeth Jaffee, co-director of cancer immunology and leading expert on cancer and the immune system." By deciphering the methods cancer cells use to make them invisible to the immune system, Jaffee and team have developed cancer vaccines that have successfully triggered immune reactions against prostate cancer, pancreatic cancer, leukemia, and multiple myeloma.
The Hoax: Cancer is caused by Nutritional Deficiencies and Supplements Will Correct Them
The Truth: Dietary habits and lifestyle choices, such as smoking, contribute to the development of many human cancers, says Johns Hopkins Kimmel Cancer Center director William Nelson. Our experts recommend a balanced diet as a way of reducing cancer risk. In terms of supplements, Nelson points out that while they may help mediate vitamin deficiencies, taking doses above what the body needs provides no added benefit.
The Hoax: Chemotherapy and Radiation Therapy Harms Normal Cells. Surgery Causes Cancer to Spread
The Truth: Chemotherapy and radiation therapy kills cancer cells with remarkable selectivity, says Nelson. There are some temporary and reversible side effects common to cancer therapies, including hair loss and low blood counts. Limiting and managing these side effects is an integral part of treatment.
Surgery is the first line of treatment for many types of cancer. It does not cause cancer to spread. Cancers spread to other tissues and organs as a tumor progresses and cancer cells break away from the original tumor and travel through the bloodstream to other body sites.
The Truth: The premise is that cancer cells feed on certain foods, and if a person refrains from eating these foods, the cancer will die. According to our experts, a poor diet and obesity associated with a poor diet is a risk factor for the development of cancer. However, there is no evidence that certain foods alter the environment of an existing cancer, at the cellular level, and cause it to either die or grow.
While there is such a thing as tumors that produce mucus, the mucus made by a tumor does not result from drinking milk. And, eating less meat, while a good choice for cancer prevention, does not free up enzymes to attack cancer cells, explains cancer prevention and control expert Elizabeth Platz.
Moderation is key, says Platz. As part of a balanced diet, sugar, salt, milk, coffee, tea, meat, and chocolate—the foods the “Update” calls into question—are all safe choices, she says. The real concern with many of these, particularly sugar, is that it adds calories to a diet and can lead to obesity, and obesity is a major risk factor for cancer. A balanced nutritious diet, healthy weight, physical activity, and avoiding alcoholic drinks may prevent as many as 1/3 of all cancers. Platz recommends eating at least five servings of fruits and vegetables per day and limiting red and processed meats, like hot dogs.
Several Johns Hopkins experts participated in the World Cancer Research Fund - American Institute for Cancer Research report Food, Nutrition, Physical Activity, and the Prevention of Cancer: A Global Perspective, published in November 2007, which is considered by cancer prevention experts to be an authoritative source of information on diet, physical activity and cancer. Their recommendations for cancer prevention and for good health in general are:
Be as lean as possible without becoming underweight.
Be physically active for at least 30 minutes every day.
Avoid sugary drinks. Limit consumption of energy-dense foods (particularly processed foods high in added sugar, or low in fiber, or high in fat).
Eat more of a variety of vegetables, fruits, whole grains and legumes such as beans.
Limit consumption of red meats (such as beef, pork and lamb) and avoid processed meats.
If consumed at all, limit alcoholic drinks to 2 for men and 1 for women a day.
Limit consumption of salty foods and foods processed with salt (sodium).
Don't use supplements to protect against cancer.
Our experts recommend that people meet their nutritional needs through their food choices. While vitamin supplements can be helpful in people with nutritional deficiencies, evidence suggests that supplementation above what the body can use provides no added health benefit.
The Hoax: Cancer is a Disease of Mind, Body, and Spirit
The Truth: Cancer is a disease caused by genetic alterations. Many times, these alterations occur through our own behaviors—cigarette smoking, a poor and unbalanced diet, virus exposures, and sunburns, says cancer prevention and control expert John Groopman.
How stress, faith, and other factors influence this is largely unknown. We would like people to be happy, loving, and stress free, simply because it is a nice way to live and can contribute to an overall feeling of well being, says Platz. There is no evidence, however, that a person prevents or causes cancer based on his or her state of mind.
The Truth: Platz recommends regular exercise as a part of any healthy lifestyle, but says there is no evidence that breathing deeply or receiving oxygen therapy prevents cancer.
On its Web site, the American Cancer Society includes the following statement about oxygen therapy, “Available scientific evidence does not support claims that putting oxygen-releasing chemicals into a person's body is effective in treating cancer. It may even be dangerous. There have been reports of patient deaths from this method.”
Please pass this information on to family and friends.
The Hoax: An Acid Body is a Magnet for Sickness
The hoax: An acid body is a magnet for sickness, disease, cancer and aging. Eating more alkaline foods helps shift your body's pH and oxygenates your system. Alkaline foods keep your body healthy and functioning correctly, preventing and combating cancer.”
The Truth: Our experts say that, in general, the answer is no. There aren't acid bodies and alkaline bodies. Blood pH is tightly regulated. However, when people are really sick, they may no longer be able to regulate their blood pH. I have included a few other reputable sources below that also list this contention.