Cancer Epidemic Among Males

It’s a common misperception that the human papillomavirus (HPV) vaccine is intended only for females. However, new data makes it alarmingly clear why both boys and girls should receive this critical cancer-preventing vaccination.

What replaced cervical cancer as the most common cancer associated with HPV infection in the United States? Oropharyngeal (head/neck) squamous cell carcinoma (SCC) in men, according to the August 24, 2018 edition of the Morbidity and Mortality Weekly Report (MMWR) by the Centers for Disease Control and Prevention (CDC).

Figure 1: Adapted from CDC’s Morbidity and Mortality Weekly Report (MMWR) / August 24, 2018 / 67(33);918–924

From 1999–2015, cervical cancer incidence rates decreased by 1.6% per year on average, going from 13,125 in 1999 to 11,788 in 2015. During this same period, oropharyngeal SCC incidence rates increased by 2.7% per year on average among men, more than doubling from 6,966 in 1999 to 15,479 in 2015. See Figure 1.

The decline in cervical cancer from 1999 to 2015 is the continuation of a favorable trend since the 1960s when cervical-vaginal screening increased significantly as Americans endorsed the Pap test. The incidence of cervical cancer plummeted from 21.6 per 100,000 women in 1969 to 10.4 per 100,000 in 1990. According to the latest CDC report, the rate of cervical cancer further declined to 7.2 per 100,000 women in 2015.

Early detection through routine screening has reduced the death rates from cervical (via Pap test), breast (via mammogram), and other cancers. Currently, there is no routine screening test for HPV-associated diseases other than cervical cancer. Oral dental screening may detect cancer or precancerous lesions that may lead to oropharyngeal SCC at an early stage. However, it is difficult to determine from a visual examination which abnormal tissues in the mouth are worthy of concern. The average person routinely has conditions existing in their mouths that mimic the appearance of pre-cancerous changes, which could lead to unnecessary biopsies and invasive testing.

Figure 2: Adapted from CDC’s Morbidity and Mortality Weekly Report (MMWR) / August 24, 2018 / 67(33);918–924

To prevent HPV-related cancers and other ailments, HPV vaccination was added to the routine immunization program for US females in 2006 and the program for US males in 2011. See Figure 2. But as of 2017, only 49 percent of adolescents (53.1% of females; 44.3% of males) received all the recommended doses to complete the HPV vaccination series. That is less than a 5% increase from 2016 when 43.4% of adolescents (49.5% of females; 37.5% of males) were up to date with the HPV vaccination series.

The combination of comparably lower vaccination rates with a lack of screening tools is helping fuel the oropharyngeal SCC epidemic among males. Continuing at its current growth rate, the annual new cases of oropharyngeal SCC in men could reach 17,685 by 2020 and 20,204 by 2025.

The CDC estimates that nearly 80 million Americans are currently infected with some type of HPV, with about 14 million people newly infected each year. If your preteen (boys and girls) hasn’t been vaccinated against this cancer-causing virus yet, talk to their doctor or nurse about getting it for them as soon as possible and please read my passionate plea to parents of preteens.

 

 

Update: Stereotactic Body Radiation Therapy (SBRT)

In my prior post, I discussed a worsening cough and recommendation from my oncologist, Dr. David Pfister at Memorial Sloan-Kettering Cancer Center (MSKCC), to consider stereotactic body radiation therapy or SBRT. This treatment is designed to deliver extremely precise, very intense doses of radiation to cancer cells while minimizing damage to healthy tissue.

My radiation oncologist, Dr. Nancy Lee at MSKCC, developed a treatment plan using SBRT to target single tumor sites in each of my lungs and spleen. Starting with my left lung, the first treatment took place Monday, July 23, 2018, and continued on Wednesday and Friday of that same week. The same schedule was used the following week for my right lung. A single SBRT session was used to target the lesion on my spleen, which was completed last Wednesday, August 15, 2018.

The unit for radiation measurement of absorbed dose is “gray” (Gy). I received a total of about 27 Gy to each lung site (9 Gy per session / 3 sessions) and about 9 Gy to my spleen in a single session. In contrast, I received about 70 Gy to my head/neck over the course of 7 weeks back in early 2016 as part of my conventional chemoradiation treatment.

With SBRT, only a small area of your body is exposed to radiation. This means that SBRT usually causes fewer side effects than other types of radiation therapy. According to patient education materials provided by MSKCC, about half of the people who have SBRT don’t have any side effects from treatment.

So far, the SBRT “experience” has been exactly as billed. Other than post-traumatic stress from going through the radiation procedure again, along with some mild fatigue, I haven’t experienced any significant side effects from SBRT. Encouragingly, my cough has already diminished both in frequency and severity. So, the radiation is likely doing its job of shrinking tumors that may be obstructing my airway.

Towards the end of September, I’ll have another CT scan to see how the radiated (and non-radiated) tumors responded to the SBRT. Radiation can cause inflammation in the short-term, which hampers the interpretation of scan results. Accordingly, it is prudent to wait at least a month before imaging.

Until then, I’m continuing my human papillomavirus (HPV) awareness activities and encouraging vaccination of preteen boys and girls to help prevent six cancers linked to HPV. Sadly, there is still a lot of room for improvement in vaccination rates.

In 2017, nearly 49 percent of adolescents received all the recommended doses to complete the HPV vaccination series according to a new study. This is less than a 5% increase from 2016 when 43.4% of adolescents (49.5% of females; 37.5% of males) were up to date with the HPV vaccination series. Today, 51 percent of adolescents still have not completed the HPV vaccine series!

To be meaningful, HPV vaccination rates need to be closer to the Centers for Disease Control and Prevention’s (CDC) Healthy People 2020 target of 80 percent coverage. This isn’t unrealistic, as around 80 percent of adolescents receive two other recommended vaccines—a vaccine to prevent meningococcus, which causes bloodstream infections and meningitis, and the Tdap vaccine to prevent tetanus, diphtheria, and pertussis.

Parents, I beg you again—please vaccinate your children against HPV.