The UCLA's California Health Interview Study (CHIS) shows that gay and bisexual men are twice as likely as straight men to have been diagnosed with cancer:
The research, from California, found that gay men were almost twice as likely as straight men to have been diagnosed with this disease. On average, diagnoses happened a decade earlier for gay men.
Of course, normal caveats apply. The population of gay and bisexual people was self-identified (of course) in a telephone interview for the study. The 2009 CHIS produced an estimate was over two percentage points fewer than Indiana University's National Survey of Sexual Health and Behavior from the same year, which was based on an online survey. And the CHIS is a study of Californians, not all Americans. That doesn't mean there isn't value in this finding, although it would be great to more information about the subject in later studies, especially in studies that don't just target the LGB population.
The more important question is "why?" and the Pink News article indicates that those working in this field say that's a good question. Studies have shown that LGB people smoke more than straight people, which can cause lung cancer. According to the National Cancer Institute, lung cancer is the most common type of cancer there is, and increased smoking among LGB people could significantly affect overall cancer statistics.