== Improvement suggestions == 

 I'm following up on Why is this article not a Wikipedia:Featured articles?, a thread of about a year ago. Cancer is quite good but it's not yet up to featured article quality. Here are some suggestions to improve it. 

 * The lead is almost entirely unsourced, and large chunks of the body are unsourced. My little (and incomplete) review of the epidemiology material (see #Cancer epidemiology problems) found several serious sourcing problems; in many cases the claims were undoubtedly correct, but in at least two cases the claims appeared to be wrong. This stuff needs sourcing. 
 * There are too many images running down the right side of the page at the start of the article. The lead images should be cut down to the diagram plus one photo of a cancer. The other images can be moved elsewhere as appropriate. 
 * The article is way too long. I suggest cutting it down by (say) a factor of two. 
 :* Some sections can be moved into subarticles. Subarticles should be created for Cancer prevention, Cancer treatment and Pathophysiology of cancer. 
 :* Also, Causes and Epidemiology could use drastic trimming. Other sections can be trimmed too. 
 * The lead is way too long, perhaps even by a factor of three, and should be trimmed. 
 * The section headers should be redone a bit, to follow the guidelines in WP:MEDMOS #Diseases/disorders/syndromes. I suggest the following order: 
 :* Classification 
 :* Signs and symptoms 
 :* Causes 
 :* Mechanism (renamed from Pathophysiology) 
 :* Prevention 
 :* Screening 
 :* Diagnosis 
 :* Treatment 
 :* Prognosis 
 :* Epidemiology 
 :* History 
 :* Research directions (renamed from Research) 
 :* In other animals (new material; should be brief) 
 :* References 
 :* Further reading 
 * The See also section should be removed. Its wikilinks should be either moved into the main body of the text, or removed. 
 * The External links section should be removed, or trimmed down to one link, namely the Open Directory Project link. The current external links section is waaayy too large and is a WP:LINKFARM. 
 * In some cases the material is written too much from the U.S. perspective. It's understandable why this would be, but we should strive harder to use global data where available. 

 Comments?