The Topic of Cancer

""CANCER?! DO YOU EVEN KNOW WHAT A CANCER IS?! CANCER IS A SMALL PIECE OF DEATH THAT SLOWLY TAKES OVER A BODY!""

- Shouty Guy from Mondo Medicals explains cancer.

There are all manners of terrible diseases out there, deadly and incapacitating, annoying and disfiguring, and even a few truly horrifying fates worse than death.

But in the world of fiction (and according to popular belief, in real life as well), one disease stands tall and terrible above the rest- a disease so deadly, so silent, so inevitable, so evil, that its very name has become synonymous with death. A disease whose mere mention provokes feelings of foreboding terror, disgust and paranoia in modern humans: the dreaded Malignant Neoplasm, or in layman's terms, Cancer.

There are countless types of cancer, but all share the same defining nature: in a cancer, the reproduction of cells goes out of control. Instead of dividing and multiplying in an orderly fashion, as they should, the cells multiply chaotically and violently without stopping, invading nearby parts of the body, and sometimes even spreading further through the bloodstream or lymphatic system. Ideally, cells have several countermeasures against such a destructive chain reaction starting, many emergency fall-back mechanism meant to destroy the out of control cell before it can cause damage, but once in a while, those emergency killswitch mechanisms fail.

The causes of cancer are numerous, and can include anything from old age, to exposure to certain chemicals (such as the ones found in cigarette smoke), to exposure to great amounts of radiation (this association with the evils of nuclear power or weapons may be part of the reason for the fear of cancer underlying modern society's perception) to sheer bad luck. The truth is, that in the end, nobody can say for sure who will have cancer and when. Right now, your father may be developing cancer, or your girlfriend, or your dog. Even if they've never even went near Hiroshima or Chernobyl, even if they don't smoke, even if they live in a sterile bubble, they may still develop cancer. There is no way to tell for sure without checking, and even if they turn out not to have cancer right now, nothing can assure that they won't develop one tomorrow, or in three minutes.

It could happen to anyone, any time, and they would die a slow, excruciating death as their bodies destroy themselves from the inside because of a tiny programming error in the coding of a single cell that prevented it from ever hearing the order to "stop multiplying". There would be few symptoms in the beginning, all of them easy to miss, but towards the end Body Horror will hit in full force as the tumors, black and slimy or bloated and red would become visible over the skin. Or perhaps, they never will, and all you would see is the patient writhing in agony for days before finally finding release in death. Or they could just go out with a single seizure, out of the blue...

Even if the cancer is discovered and medical treatment is available, the fact that a cancer is essentially an out of control aspect of the living body means that the only way to treat it effectively is to kill the growing body. Chemotherapy for cancer involves intentionally poisoning a person just enough not to kill them, but to (hopefully) kill the tumors growing in them. The side effects are horrific: over the course of the long, long treatment, chemotherapy and radiotherapy will cast the patient down into the dark depths of the Uncanny Valley, causing them to slowly and painfully lose anything they had of the image of a healthy human being. Hair will fall, nails will break, fat will disappear. They will vomit, and they will wither, and they will cry silently as they are transformed into pale, skinny mockeries of the human form not by a disease, but by the cure, helplessly watching this cruel world from behind lifeless, sleepy eyes.

In it's core, a cancer is the perversion of the things we hold most sacred on the most fundamental level: reproduction, life, growth, fertility. The brightest and most wonderful things in nature twisted and mutated into something frightening, something repulsive and wrong by a mindless, faceless force that still somehow manages to seem outright malevolent. It is not surprising that just by mentioning the word "cancer", any instance biological horror may instantly become scarier, any scientific experiment more taboo, any associated magic or power evil.

Note that this trope isn't just for cases of cancer appearing in fiction: The Topic Of Cancer means that the word, term, or very concept of cancer is used specifically to evoke that semi-rational, paranoid terror and revulsion and creepiness that are associated with cancer, or with implications that cancer is somehow worse in some way than other diseases of conditions.

The Littlest Cancer Patient attempts to invoke this for emotional torque, often unsuccessfully.

The inversion is The Disease That Shall Not Be Named, where the work avoids saying cancer because it's so horrifying.

Advertising

 * Anti-Tobacco ads like to point out that tobacco use causes all sorts of horrible cancers as an effort to stop people from using Tobacco. Sometimes this comes with graphic images of cancer-ridden cadavers pulled from now dead smokers and/or actual dying cancer patients.

Anime and Manga

 * Used for karmic justice (and the compulsory Body Horror) in Franken Fran - a rich villain hires Fran to extend her life and tries to get her killed to steal her research (fortunately, Fran is Ambiguously Undead and can live through decapitation). Fran returns to the villain's mansion and finds her Showing Off the New Body - the experimental formula allowed her teleomers to regenerate indefinitely, making her cells immortal... Just as the first side effects start to appear, Fran calmy explains that the only cells not programmed to die of old age are cancer cells. She then walks away, leaving her client "immortal" - as a gibbering pile of semi-liquid flesh.
 * Elizabeta from the manga Gunslinger Girl was a young Russian ballerina who developed bone cancer in her teenage years because she spent a period of her childhood in an area of the Ukraine that was heavily affected by the Chernobyl incident. Due to the generally primitive state of public healthcare in ex-USSR areas, the cancer is not contained properly and by the time Elizabeta arrives in Italy for further treatment, the doctors decide that the best bet would be to amputate her leg before the cancer spreads. Realizing that she will never be able to dance again, Elizabeta tries to kill herself (it's not a very happy manga). This is remarkable because of all the other girls' backstories, this one is the second most detailed (by far) and the most often referenced (usually by people expressing pity over the poor, poor girl with the cancer), while the stories of girls who were nearly murdered, mutilated by car accidents, raped or born with horrific disfigurements get barely a line. The only story that gets more screen time than Elizabeta's is of the girl who was used as a living prop in snuff porn films.
 * Mitsuki Koyama, protagonist of the shojo manga Full Moon o Sagashite, has a cancer in her throat played for full terror-tragedy value. In her particular case, her dream is to become an idol singer, but the only way to remove the cancer by the point the story begins involves a surgery that would render her permanently mute.

Comics

 * Used as Fate Worse Than Death in one version of Spider-Man - It turns out Eddie Brock has cancer which, through hormonal imbalance, causes fits of rage, ruining his life. The symptoms also attract the symbiote to him. The symbiote wants to take over Peter but ends up attached to Brock and unable to switch hosts again. It has the power to stop the cancer from spreading but can't afford to cure it as it relies on it for food - this leaves Brock superpowered, angry and in constant pain - for the rest of his life.
 * A minor but very creepy Spider-Man villain Styx was at one point called "living cancer" - he was a victim of Playing with Syringes trying to find a cancer cure by way of Acquired Poison Immunity - by exposing him to mutagens. Instead it gave him a power to make anything he touches wither and rot. The experience also twisted his mind - if his ability wasn't limited to reach, he would be an Omnicidal Maniac.
 * One Incredible Hulk story (probably an annual) had a wealthy cancer patient come up with a convoluted plan to get the Hulk's gamma-irradiated blood in the hopes that this would make his normal cells superpowered and able to overcome the cancer. Instead, the cancer cells were the ones that became super-powered, with nightmarish results. There was a callback to this years later when Hulk learned that one of his old friends was dying of AIDS and refused to donate his blood for fear something similar would happen.
 * Doctor Manhattan from Watchmen is extremely distraught to discover that the radiation emitted by his physical avatar gave his friends cancer.
 * One extremely Darker and Edgier alternate universe story for Marvel had Bruce Banner transform into a cancerous Blob Monster instead of a green hulk.
 * Vic Sage's battle with cancer forms one of the main storylines of 52. And then he dies of it.
 * The drug "Mayfly" from Empowered gives you super intelligence, but will kill you within 24 hours from brain cancer (that is, assuming it doesn't just do that without giving you anything in return). Unless you manage to use your newfound genius in order to survive... as a horrible, grotesque mass of cancerous flesh.

Film

 * Monty Python's Flying Circus: in an animated segment a prince sees a black spot on his face, but ignores it. Then he dies of cancer.
 * A bit of an oddball example is in Tommy Wiseau's The Room, wherein the Love Interest's mom flat-out states that she has terminal breast cancer during one scene. This is promptly forgotten and never mentioned again.
 * One day, the main character of Phenomenon sees a flash of unearthly light, hears a strange sound, and falls unconscious. When he wakes up, he's got super-intelligence and even psychic powers.

Literature

 * The story "Metastasis" by Dan Simmons is built heavily around this trope. Apparently cancer.
 * Tuf Voyaging has a "cancer creature/living tumor" example in the "Meatbeast" that Haviland Tuf proposes as a temporary solution to S'uthlam's overpopulation induced food shortage.

Live Action TV

 * Scully almost died of alien-induced cancer in The X Files. Other abductees were not as lucky.
 * In one episode the Monster of the Week was a man made entirely of cancerous tissue. He could regenerate the loss of his head and had to eat cancerous tissue removed from surgery patients (he worked in a hospital).
 * In medical tv shows, Scrubs for example, while cancer -is- often shown to be horrible, other types of diseases can be shown to be just as bad at times.
 * The series Breaking Bad revolves around the protagonist, Walter White, discovering during the pilot that he has terminal lung cancer. It is this discovery that kick-starts the action of the show.
 * An early monologue by Bruce McCullough on The Kids in The Hall had him apologizing to everyone for "causing all of that cancer". He says he did it because he "didn't realize it was such a horrifying disease" and he was "just on a roll".
 * In House, now that  it's an opportunity for the writers to both show more of their relationship with House, and how firsthand knowledge of what cancer actually does to patients affects their reasoning when seeking treatment.

Tabletop Games

 * D&D's Book of Vile Darkness - a Plaguemaster Prestige Class "cancer mage" gets a sentient tumor as a familiar: the entire idea of the Cancer Mage is that cancer is something disgusting, creepy, and in this case actually, cosmically evil.
 * Call of Cthulhu (tabletop game) supplement The Asylum and Other Tales, adventure "The Asylum". One of the drugs Dr. Freygan uses to create proto-shoggoths is called Cellular Accelerator. It can heal wounds quickly, but there's a chance it will cause cancer throughout the recipient's body. The victim will be reduced to a mass of suppurating flesh within 2-12 days and die 1-3 days later.
 * Amber Diceless Role Playing. If characters with Shape Shifting push themselves beyond their limits while suffering from exhaustion or starvation, they can suffer from Primal Chaos Cancer. Some of their cells run wild, consuming normal cells and multiplying quickly. The rogue cells will eventually attack vital organs, appear on the skin and eat the character alive, turning him into an amorphous blob.
 * In Promethean: The Created, the mysterious sixth Lineage are the "Zeka", Prometheans animated and fueled by radiation that have a lot of disturbing, creepy abilities. Among them are the ability to give other people regular, boring old cancer, but if you want to get freaky, you can give them a tumor with a mouth that can speak to them, or a mind control brain tumor, that is implied to cause endless excruciating pain and leave the victim a helpless puppet with full consciousness but no control over their actions. When Zeka use their powers, their "Disfigurement" usually involves huge cancerous masses growing from within them, boiling, bloating, and pulsating as their skin falls off and their eyes melt. Even when not showing their powers, most of them have signs of radiation poisoning or cancer, such as visible tumors on their faces. Then there are the Carcinoma, which is what you get when Zeka tries to make more of themselves and fail horribly: hideous monstrosities made completely out of cancer, with an alien, incomprehensible, malignant intelligence.
 * "Hunchback the Lurching", a fan gameline for the New World of Darkness: As a drinking game, take a shot when the lump is described as "Cancerous", "Malignant" or "Tumorous". Just don't blame me when you lose your liver.
 * In Scion, the Titan of the Blighted Earth, Crom Cruach, nemesis of the Tuatha De Danaan, is associated with stillbirth, madness, fungi, vermin, rot, mutation and cancer, and has a very strong theme of the "perversion of life". His minions, the giant fomorians, are generally horribly disfigured, and their ugliness is said to often include tumors all over their body.

Video Games

 * In the original Civilization, developing a cure for cancer gave you one happy citizen in every single city, no strings attached.
 * The creepy biological macguffin from Oni, the Chrysalis, is repeatedly described as being like cancer.
 * The page quote comes from Mondo Medicals. Let's just say a certain character is... passionate about the Topic of Cancer.

Web Original

 * In Homestuck, Karkat (who uses the trolltag carcinoGeneticist and the astrological symbol of cancer) admits to John he may have given John's universe cancer.
 * And it turns out the cancer is Jack Noir. The fact that he is basically an AnthropomorphicPersonification of a cancer pretty much sums up ["Omnicidal Maniac|his personality."]
 * Shows up in more than a few Xkcd strips, as Randall Monroe's now-wife had been diagnosed with stage-3 breast cancer during their engagement.

Western Animation

 * An episode of Arthur had the school's lunchlady reveal that she had cancer. Significant, I think, in that a kids' show addressed it so openly.
 * Discussed in the South Park episode "Tonsil Trouble". Of course they have to bring it Up to Eleven by having activists claim that just having AIDS is way better than having cancer.