This can possibly be vetted to help you define the Cancer more...
Mesothelioma Infrequently, Greatly 10pts. / Frequently, Greatly 15pts. / Frequently, Fully 20pts. Mesothelioma is a rare cancer in which tumor cells grow in the chest cavity, abdominal cavity, or around the heart. This disease is caused by multiple consecutive daily exposure to high levels of asbestos (other materials are also suspected causes). Early symptoms resemble either those of respiratory viruses (shortness of breath, chest pain, persistent cough, fever, weight loss, night sweats) or those of gastrointestinal disease (abdominal pain, abdominal bloating, nausea, weight loss, swelling of the feet, anemia). The disease is progressive and has no reliable treatments. Patients with advanced stages of this disease have heightened and multiple symptoms. At the Greatly level, the character must make a Constitution Roll (every 8 hours at Infrequently, every hour at Frequently). Failure of this roll reduces the character's Constitution by 1d6 (along with it's Figured Characteristics) until a recovery Constitution Roll is made (check hourly or less if medical help is available). Furthermore, the character suffers a -2 penalty to Constitution Rolls for resistance to respiratory diseases. At the Fully level, in addition to the Constitution Rolls, the character cannot have a starting Constitution value higher than 8. Characters with the Greatly level have a shortened lifespan, and those with the Fully level have a life expectancy of 4-6 months.
Taken from http://www.cellularsmoke.net/rpgs/ml_physical.php - The trick with the "Way Back Machine is to change the date at the top of the archive to about July 2009.
Edited to show an actual cancer disease...