Aggressive Lung Adenocarcinoma Subtype May Require New Treatment Strategy

Microscopic image of adenocarcinoma lung cancer cells

This cell pattern, known as solid predominant subtype, is an aggressive form of lung adenocarcinoma that has a high risk of returning after surgery in multiple locations.

Patients with early-stage lung adenocarcinoma, the most common form of lung cancer in the United States, typically have their tumors surgically removed without additional treatment. This has been the standard therapy for stage I patients whose tumors are small and have not spread to nearby lymph nodes.

Now research led by Memorial Sloan Kettering thoracic surgeon and scientist Prasad Adusumilli has identified a subset of these patients whose cancer is more likely to return soon after removal, often appearing in multiple locations and ultimately proving more lethal.

These patients have a form of lung adenocarcinoma called solid predominant subtype.

“Our study shows that tumor size alone is not sufficient in predicting how the cancer will behave,” says Dr. Adusumilli. “We can now identify aggressive tumors among early-stage lung cancers, and these patients may require closer follow-up and additional adjuvant treatments, such as chemotherapy, or newer therapies which include drugs that target specific genetic mutations.”

We can now identify aggressive tumors among early-stage lung cancers.
Prasad S. Adusumilli thoracic surgeon

Until now, surgery was thought to be sufficient for treating patients with tumors less than 5 centimeters in diameter. The new study, published in the Journal of Clinical Oncology, shows that some of these tiny tumors — even those smaller than 2 centimeters — come roaring back soon afterward.

This finding could change the course of treatment for a significant number of patients with lung adenocarcinoma, a form of non-small cell lung cancer. Although currently only about 20 percent of patients are diagnosed before the cancer has spread to other parts of the body, this portion is expected to increase as more people undergo low-dose CT scans to screen for the disease. Medicare recently approved coverage of these scans for people who are at high risk for lung cancer due to smoking.

Stark Differences among Subtypes

There has been a growing appreciation that the multiple subtypes of lung adenocarcinoma behave differently. As a result of tumor data from MSK and other cancer centers, the International Association for the Study of Lung Cancer (IASLC), the American Thoracic Society (ATS), and the European Respiratory Society (ERS) jointly issued a new tumor classification system in 2011 that characterizes lung adenocarcinomas as a mixture of five subtypes based on histology (how cancer cells look under a microscope).

To help determine prognosis, pathologists now report the proportions of the five subtypes within the tumor — including the predominant subtype, which makes up the highest proportion of tumor tissue — as well as tumor size.

CT scan of lung cancer

A low-dose chest CT scan of a patient with solid predominant subtype of lung adenocarcinoma.

The new classification system has already begun to change the management of lung adenocarcinomas. In 2013, Dr. Adusumilli, working with MSK pathologist William Travis, showed that a subtype called micropapillary (MIP) morphology was more likely to recur after a limited operation known as wedge resection, in which the tumor and only a small amount of surrounding tissue are removed. This high rate of recurrence held true even for MIP tumors smaller than 2 centimeters.

However, the recurrence rate was lower if the patient had undergone a more extensive procedure called lobectomy, which removes the tumor along with up to a third of the lung. This discovery has helped guide doctors in deciding how much of the lung must be removed to adequately reduce risk of MIP recurrence.

Back to top

Rapid Recurrence at Multiple Sites

In the new study, Dr. Adusumilli and colleagues investigated how various subtypes were related to recurrence in a larger group of patients. They looked at more than 1,000 stage I lung adenocarcinoma patients who had their tumors removed at MSK and who were followed afterward with CT scans for an average of five years. They found that the solid predominant subtype, which made up one in seven stage I tumors, was especially aggressive.

Patients with this subtype had a 33 percent risk of recurrence over five years, compared with a risk of only 17 percent in the entire group. More importantly, solid predominant tumors usually recurred within two years, often at locations outside the chest area. The chance of recurrence was actually highest at the one-year mark. Patients with the solid predominant subtype were also more likely to die from their lung cancer more quickly after the cancer returned.

Solid predominant tumors usually recurred within two years, often at locations outside the chest area.

“With the risk of recurrence peaking at one year and the cancer coming back outside the chest at multiple sites, it shows this is a very aggressive subtype that has either already spread undetected or spreads quickly and has poor outcomes,” Dr. Adusumilli says. “If I operate on a patient now and see a solid predominant tumor, I know the chance of it coming back is high, so I need to closely follow up with more frequent CT scans and possibly add adjuvant therapy to help decrease that risk.”

Back to top

Identifying Aggressive Tumors before Surgery

Dr. Adusumilli emphasizes the urgent need to identify these aggressive tumors well before operating. His laboratory, along with others at MSK, is already working on identifying several markers that can serve as early detection indicators.

He also underscores the importance of surgeons working closely with pathologists to determine tumor subtype and choose the best course of treatment for the patient after the tumor is removed. “Even for these early-stage tumors, we need the kind of multidisciplinary approach that is possible at centers like ours that involves the highly developed expertise of our pathologists to help surgeons make the best treatment decisions,” he says. 

Back to top

This research was supported by Grant No. LC110202 from the US Department of Defense. 


Commenting is disabled for this blog post.

My very dear friend was diagnosed with Adenocarcinoma in 7areas including his back that he had to have surgery or chance not walking again ! I'm not understanding all of this. Can you please help me understand ?

We’re sorry to hear about your friend’s diagnosis. Adenocarcinoma can originate in many different organs in the body, and then can spread to other locations. Without more detail about where your friend’s tumor originated, we are not able to provide information on how this cancer might be treated. We recommend you call the National Cancer Institute’s Cancer Information Service at 800-4CANCER if you’d like to discuss this with someone. Thank you for your comment.

My husband was diagnosed this week with NSCAC that has spread to the adrenal gland. After CT, MRI and X-ray of everything from his brain to his pelvis, they find no tumor. Left adrenal glad is 4X normal size. Lots of cells in the pleural lining of the lung and a CEA of 16. How common is adenocarcenoma without a mass?

Currently a pat. of Dr.M.D.Hellmann, MD I was a pat. of Dr. Seagals and MEDI 4736 clinical trial. NSC stage 4 in right lung, limp nod, and brain. It's gone It's all good Thank God and the DR. at you Hospital.

On Nov 4, 2015 , had my upper right lobe resected due to Adenoma Carcinoma. Lymph nodes all clear, cancer gone per Pathology report. How do I get the sub type identified moving forward? Is sub type identity mandatory to plan for future scans or recurrence?b Should the pathology report include sub typing of one of five sub types of Adenoma Carcinoma? 69 year old female pleased with robotic resection and post op so far. Patient of Kathryn O'Keefe, MD. Cincinnat, OH

Ann, thank you for your question. We recommend you speak with your doctor about the pathology report and finding out what subtype you have. If you are interesting in making an appointment with a Memorial Sloan Kettering physician for a consultation, please call our Physician Referral Service at
800-525-2225 or go to­care/appointment.

eXcellent site and I am now able to understand my recent Lobectomy for Adenoma Carcinoma. Now, wondering what my sub type is. Your site has enabled me to have the right inquiries & followup questions Thank you,


Viola, we are unable to comment or speculate on individual cases. We are very sorry for the loss of your mother.

What happens once the fluid is removed and it is not accumulating anymore. I am sure they take the drainage out, but what is next. My mother is thinking she is going to be cured but after going through my own cancer I do not believe that is the case. I am heartbroken as she seems not to have a clue that this is fatal, even though her doctor at Mt Sinai told her. I am a little confused as well why she wasn,t able to get surgery. I just read above that radiation does not affect the cancer. Please tell me what to expect and also are there any questions I should ask her doctor. I will be meeting for the first time in 2 weeks as I live distant to my mom. THanks in advance.

Seth, thank you for reaching out. We suggest you speak with your mother’s physicians about these questions as we are unable to provide specific medical advice—every patient’s individual case is affected by a large number of factors. At Memorial Sloan Kettering, we provide emotional support and strength to deal with cancer, and we suggest you consult with her physician to find out about similar support (patient support, including counseling) that provide these benefits.

I had a lobectomy of the right upper lung on Jan 11, 2016. Am still in the hospital & found you site extremely helpful in understanding all this. Before my surgery, I thought it would be a "walk in the park". The tumor was thought to be small, they would cut it out & happy days again. I was totally unprepared for the roller coaster that lied ahead. I had a PET scan before surgery & no other cancer was found. Now I was told it is adenocarcinoma and my type could have spread to the brain, a CT is ordered but then the agony of waiting for results. I hope we can talk about the Lord on this site because I prayed all night. It was all negative. Then we are told Chemo may be necessary to make sure it does not spread. After another day we find out the 5 year follow plan will be sufficient as it was stage 1B. I didn't mean to get so lengthly with this but was unprepared to know what questions to ask. My medical team is top notch but I suspect they thought I on top of it all when I had no questions to ask. Your sight has really explained the things I needed to know & I hope my comment helps someone who has just learned they have cancer. Thank you & Bless your Cancer Center and this site.

Edwina, we’re very happy that our site has been helpful to you. Best wishes for you in your recovery, and thank you for your kind words.

I was diagnosed yesterday with pulmonary adenocarcinoma (bronchoscopy biopsy). The pathology report as follows :
> malignant cells are strongly positive for TTF1 while negative for p63.
> histologic features support poorly differentiated histology and a spindled component.
I currently have two tumors both under 2 centimeters.
What does the report really tell me ??

Dear Larry, we are sorry to hear about your diagnosis. It’s best to talk to your doctor to interpret the results of your pathology report and how it will impact your treatment options and prognosis.

You may also be interested in checking out the American Society of Clinical Oncology (ASCO)’s website for patients, which offers some great patient education resources, including information about how to read your pathology report:….

We hope this is helpful. Thank you for reaching out to us.

I have a 59yo patient diagnosed with primary adenoca lung Grade 4. He would like to come to SK Centre for assessment & treatment. Pls advise who the most appropriate specialist would be.
We reside in Sydney, Asutralia.

Dear Dr. Bakaric, our International Center can assist you in making arrangements for either a medical records review by mail or in making an appointment for your patient with the most appropriate specialist. Please contact them directly at or for more information go to Thank you for reaching out to us.

My mother was diagnosed with adenocarcinoma in November 2015. She under went radiation and just recently found out that the cancer has grown. She now has two tumors and her doctors are unsure if the radiation was ever actually effective. She also has COPD and a pulmonary specialist has stated a loboectomy would likely reduce her lung capacity to drastically. Are there new treatment options or alternative options that she should look into for a course of treatment that would not drastically reduce her lung capacity or hinder her quality of life?

Dear McKenzie, we’re sorry to hear that your mother is going through this. If you’d like to learn about treatment options for your mother at MSK, you can call our Physician Referral Service at 800-525-2225 or go to for more information on making an appointment.

If your mother is not able to travel to New York, you may want to consult with a specialist at a comprehensive cancer center near you to find out whether treatments such as targeted therapies or immunotherapies may be appropriate for her. You can find a list of National Cancer Institute-designated cancer centers at . Thank you for your comment.

My Mum had a lung resection to remove 2/3 due to a grade 3a adenocarcinoma which was followed up by chemotherapy. Lymph nodes were removed around the site too. She has had annual check ups, scans and broncosopy and has been 5 years clear. She has recently been diagnosed with a brain tumor about 3cm (after what we thought was a mini TIA), neurosurgeon suspects it is connected to her lung cancer though a repeated CT scan on lungs and bowels was clear. Is this likely? Is it likely to be present elsewhere in the body too given we have been 5 years clear. We are confused and concerned. We will know more once the craniotomy is performed tomorrow but I wanted some thoughts from other professionals. Thank you

We’re sorry to hear about your mother’s recent diagnosis. When cancer recurs years after treatment, it can appear in one or several parts of the body. It may not recur in the original location. But it’s also possible that this may be unrelated to her previous cancer. We recommend you discuss this more with her doctors after the biopsy has been performed. Thank you for your comment, and best wishes to you and your family.

My brother in law has stage 4 lung cancer (adenocarcinoma). He has tumors in his back, lung, and adrenal glad. He has mets in his brain. He is currently getting radiation for the mets, and he has had 3 versions of chemo, the last is a trial called TAPUR ( chemo pill). We are waiting to hear if this is working. If not, can Sloan be an option for him?.

In april they found out i had nsclc i had surgery on 8-23 spent 5 days in the hospital I had surgery and had the upper and middle lobes of the right lung removed and was told it was invasive adenocarcinoma nsclc after the the surgery they scrapped the lung I just had the port put in and am waiting for ct scans of chest abdomen and pelvis I sm supposed to be getting chemotherapy with combination of altima and cisplatin then doing clinical trial.. How worried should I be about this type cancer being aggressive and coming back

Dear Laura, we’re sorry to hear about your diagnosis. Because every patient is different, we are not able to answer questions like this on our blog. We recommend you discuss this with your healthcare team. If you would like to make an appointment at MSK for a consultation, you can call 800-525-2225 or go to for more information. Thank you for your comment, and best wishes to you.

Could you please tell me if it is now understood that ground glass opacities are cancers?
I am interested in the latest research into the composition of ggo's.
Thanak you.

Dear Susan, if you are interested in this research, we recommend you contact the Radiological Society of North America or the American College of Radiology. Thank you for your comment.

A friend of mine was recently diagnosed with bronchogenic carcinoma, by a local hospital in Pennsylvania. She previously had cervical cancer within the last 2-years, as well as pre-cancerous fibroids/nodules on her thyroid and lymph nodes. What area/doctors should she try to see at Sloan for their opinion and confirmation of this diagnosis? Is this recent diagnosis, if correct, typically seen in those that previously had cervical cancer and fibriods and nodules. Thanks for your help.

Dear John, we’re sorry to hear about your friend’s diagnosis. If she would like to make an appointment for a consultation at one of MSK’s locations in New York or New Jersey, she can call 800-525-2225 or go to for more information on making an appointment. Thank you for your comment, and best wishes to you and your friend.

Diagnosed with andenocarcinoma stage 2.Underwent surgery 6cm tumor removed all areas checked and clear.What are the chances of a recurrence.

Dear Susan, we’re sorry to hear about your diagnosis but glad to hear your tumor was surgically removed. If you are interested in consulting with an expert at MSK about your risk of recurrence, you can call 800-525-2225 to schedule an appointment for a consultation. You can go to for more information or to request an appointment online. Thank you for your comment, and best wishes to you.

I had vats surgery .removed et upper lobe. No matasizing. No chemo no radiation. Done may 30th . Now in Nov still in pain numbness and band tightness under rib a s breast. Help

Dear Adele, we’re sorry to hear you’re still having pain after your surgery. We recommend that you discuss this with your doctor. Thank you for your comment and best wishes to you.

My friend was recently diagnosed with NSCLC stage 4. It's in both lungs with mets to the brain and C6-7. She was just started on a drug called Tagrisso. Would she benefit from a consultation at MSK?

Dear Wendy, we’re sorry to hear about your friend’s diagnosis. If she would like to come to MSK for a consultation, including to find out whether she may be eligible for a clinical trial, the number to call is 800-525-2225. She can go to for more information. Thank you for your comment and best wishes to you and your friend.

My mother was diagnosed with grade 3 poorly differentiated Adenocarcinoma overseas, I live in NJ, and would like to know what is her treatment options?

My wife has mucinous andenocarcenoma with D12 Kras mutations.
We are told there is no specific chemotherapy treatment for this cancer and give her 6 months to live. ..please help

Dear Jack, we’re very sorry to hear about your wife’s diagnosis. If she would like to come for a consultation at MSK, you can make an appointment online or call 800-525-2225. Thank you for your comment and best wishes to both of you.