Three Lung Cancer Treatments and How They Work

Lung cancer treatment can feel like a maze of unfamiliar terms, especially when doctors mention chemotherapy, targeted therapy, and immunotherapy in the same breath. All three can treat the disease, but they operate through completely different mechanisms. Dr. Jia Luo, a thoracic medical oncologist at Dana-Farber Cancer Institute in Boston, Massachusetts, recently explained how each approach works, what patients should expect, and how side effects can be managed without derailing daily life.

Three Main Treatment Categories

Luo outlined three major categories that lung cancer patients may encounter. The choice of treatment depends on the type and stage of the cancer, whether specific biomarkers are present, and the patient’s overall health. Chemotherapy is the classic approach most people picture when they hear “cancer treatment.” The medications can be given intravenously or, in some cases, taken by mouth. Once in the body, the drugs travel systemically rather than staying localized to the lungs.

That means chemotherapy can reach cancer that has spread to lymph nodes or other areas. The drugs work by targeting cells that grow and divide quickly — cancer cells fit that description, but so do some healthy cells, which explains why side effects occur. “The good thing in 2026 is we, for lung cancer, have a lot of treatments that we can give to help with those side effects,” Luo said. That means patients often don’t have to pause their normal routines. Oncology teams can recommend medications and strategies to keep symptoms in check.

How Targeted Therapy Differs

Targeted therapy takes a more precise route. Instead of attacking all fast-growing cells, these treatments focus on a specific mutation or marker tied to cancer cells. They come as pills, intravenous infusions, or newer subcutaneous injections under the skin. The goal is to hit a particular feature of the cancer, such as a DNA mutation or a surface marker. Biomarker testing is critical here — it looks for genetic changes that might make a patient eligible for a targeted drug. Luo encourages newly diagnosed patients to ask their care team directly: “Hey, have I had biomarker testing?”

For someone new to this world, the distinction matters. That’s why testing has become standard practice in many centers, and why patients should confirm it’s been done before making treatment decisions.

Immunotherapy and the Body’s Own Defenses

Immunotherapy works differently again. Rather than killing cells directly or targeting a mutation, it helps the immune system recognize cancer as a threat. The immune system constantly patrols the body, looking for viruses, bacteria, or abnormal cells. Cancer can sometimes disguise itself as normal tissue, slipping past those defenses. Immunotherapy essentially “reawakens” or reprograms the immune system so it can spot and attack the cancer. Most of these drugs are given intravenously, though some newer options are subcutaneous.

Side effect management is a common worry, and Luo suggests learning about potential issues before treatment starts. The oncologist advises thinking about side effects in two ways: how common they are, and how serious they could be. Patients should understand both the frequent, manageable symptoms and the rarer ones that might need urgent attention.

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For reliable information, she points to the National Cancer Institute’s “Chemotherapy and You” resource. The free guide covers potential side effects and management strategies. Luo describes it as an “encyclopedia” patients can consult when specific concerns arise, like nausea or skin changes, rather than reading it cover to cover. Communication with the oncology team is the thread that ties everything together. Patients should report new or worsening symptoms instead of assuming they’re unavoidable.

“In lung cancer in 2026, we’re very fortunate that we have actually, for the most part, great treatments to manage side effects,” Luo said. Many of her patients continue enjoying their lives during treatment, she noted, though every experience is individual.