Lung cancer remains one of the most common cancers in India, accounting for nearly 10% of all cancer-related deaths globally according to widely published public-domain cancer statistics. With rising urban pollution, smoking habits, and late diagnoses, the need for highly precise and effective treatments has become more urgent than ever. This is where radiation therapy for lung cancer, guided by the expertise of Dr. Mathangi — one of India’s most accomplished Senior Radiation Oncologists — becomes a life-transforming option for patients.
At Gleneagles Cancer Institute, Bangalore, Dr. Mathangi brings over 20 years of experience and more than 12,000 successfully treated patients to offer cutting-edge, image-guided and precision-based radiation treatments. Her leadership has positioned the center as a frontrunner in India for technologically advanced radiation oncology.
Radiation therapy uses high-energy beams to destroy cancer cells by damaging their DNA. In lung cancer, radiation is especially powerful when the tumor is localized, medically inoperable, or requires symptom relief. Modern techniques allow doctors like Dr. Mathangi to target tumors with sub-millimeter precision while minimizing damage to healthy lung tissue — a capability that dramatically improves survival outcomes.
The principle is simple: cancer cells fail to repair radiation damage as efficiently as healthy cells. Over repeated sessions, the tumor shrinks and eventually stops growing. But in today’s world, radiation is no longer the blunt tool it used to be. With breakthroughs in imaging, respiratory gating, and real-time tumor tracking, radiation has evolved into one of the most sophisticated cancer treatments available.
SBRT for lung cancer (Stereotactic Body Radiotherapy) delivers very high doses of radiation in a few sessions using pinpoint accuracy. This approach is especially effective for early-stage tumors and for patients who cannot undergo surgery. SBRT is designed to eliminate tumors in as few as 1–5 sessions, offering a non-invasive yet curative alternative.
Dr. Mathangi trained in stereotactic techniques (SRS/SBRT) in Germany, giving her unparalleled expertise in planning and delivering these complex treatments with utmost safety and precision.
SRS for lung cancer (Stereotactic Radiosurgery) is a specialized form of stereotactic radiation typically delivered in a single high-dose session. While more commonly used for brain lesions, SRS principles are sometimes applied to lung tumors when extreme precision is required. The difference between SRS and SBRT lies mainly in the dose fractionation and anatomical application.
Both techniques require advanced imaging, immobilization, and tumor-motion management — areas in which Dr. Mathangi has extensive hands-on international training.
Radiation is used in a variety of lung cancer scenarios, including:
The term advanced radiotherapy refers to a suite of technologies designed to maximize precision, minimize side effects, and tailor the dose distribution uniquely for each patient. Techniques such as IGRT, RapidArc, DIBH gating, and image-guided interstitial brachytherapy are all part of the expertise that Dr. Mathangi brings to lung cancer care.
These techniques allow real-time tracking of tumor motion (especially important for lung tumors that move with breathing), ensuring treatment is delivered exactly as planned. It is this combination of planning accuracy, technological sophistication, and clinical experience that leads to superior patient outcomes.
The TrueBeam STx machine is one of the most advanced radiation delivery systems in the world. Dr. Mathangi is celebrated for installing Asia Pacific’s first TrueBeam STx at her center — a feat that underscores her commitment to bringing world-class cancer care to Indian patients.
TrueBeam STx enables:
This technology is especially advantageous for lung cancer, where tumor motion and delicate surrounding structures like the heart and esophagus demand exceptional precision.
Patients with the following conditions may benefit significantly from radiation delivered under Dr. Mathangi’s expertise:
Every patient receives a comprehensive evaluation where tumor type, stage, location, lung capacity, and overall health are assessed. As Director of the Fellowship in Advanced Radiotherapy Techniques (affiliated with RGUHS), she leads a team using global best practices in treatment planning, immobilization, and motion management.
Her approach is rooted in precision, compassion, and evidence-based medicine — ensuring patients feel supported through every step of their treatment journey.
The center is known for:
Together, these create a world-class environment for lung cancer treatment, ensuring patients receive care that is safe, accurate, and outcomes-driven.
When dealing with lung cancer, delays or suboptimal treatment choices can significantly affect outcomes. With her internationally trained expertise, deep clinical experience, and access to world-leading technology, Dr. Mathangi offers patients a transformative advantage in treatment success.
To book an appointment, patients may submit their details through the contact form on Dr Mathangi’s official website. Her team will coordinate and confirm the appointment.
Dr. Mathangi J is a Senior Consultant & In-Charge of Radiation Oncology at Gleneagles Cancer Institute, Bangalore. With over 20 years of experience and advanced training from Germany and Denmark, she is recognized for proficiency in SBRT, SRS, IGRT, and brachytherapy. She has treated more than 12,000 patients and is known for bringing pioneering technologies like TrueBeam STx to India.
In simple terms, radiation therapy for lung cancer uses high-energy X-rays or beams to damage the DNA of cancer cells so that they stop growing, shrink, or die. These beams are delivered from outside the body by a machine that carefully directs radiation to the tumour while trying to spare as much healthy lung tissue as possible.
Under the guidance of Dr. Mathangi, a detailed planning CT scan is performed to map the exact size, shape, and position of the tumour. Based on this, a personalised plan is created that determines how much radiation you need, from which angles it will be given, and over how many sessions. During each session, you lie on the treatment couch while the machine rotates around you, delivering the planned radiation dose with millimetre-level precision.
Modern techniques that Dr. Mathangi uses also account for your breathing motion, so that the tumour receives the intended dose even as your lungs move. This combination of precise planning, image guidance, and careful dose delivery allows radiation to effectively target the cancer while reducing the risk to normal organs such as the heart, spinal cord, and healthy lung.
Radiation is often preferred when a patient is not medically fit for surgery due to age, lung function, heart disease, or other health conditions. It is also used when the tumour is in a location that makes surgery risky, or when you wish to avoid the risks and recovery time associated with an operation.
Depending on the stage and type of lung cancer, radiation may be used:
During your consultation, Dr. Mathangi evaluates your overall health, lung capacity, imaging reports, and biopsy details before recommending the most appropriate treatment pathway. She will explain clearly why radiation is being advised in your specific situation and how it will integrate with other treatments like chemotherapy, targeted therapy, or immunotherapy if needed.
SBRT for lung cancer stands for Stereotactic Body Radiation Therapy, a highly precise form of treatment in which very focused, high-dose radiation is delivered over a small number of sessions (often 3–5). It is most commonly used for small, early-stage tumours that have not spread to lymph nodes and are confined to the lung.
SBRT is particularly suitable for:
With her expertise in precision radiation, Dr. Mathangi uses advanced imaging, motion management, and meticulous planning to ensure that SBRT achieves excellent local control while keeping surrounding normal lung safe. Many patients appreciate that SBRT allows them to complete curative-intent treatment in a matter of days instead of several weeks.
SRS for lung cancer usually refers to Stereotactic Radiosurgery used to treat small metastatic deposits, especially in the brain, that have originated from a primary lung tumour. Unlike conventional radiation that is given in many small doses over weeks, SRS delivers an intense, highly focused dose in one or a few sessions.
This approach is designed to:
Under the care of Dr. Mathangi, SRS is planned using detailed MRI and CT fusion, ensuring that each metastasis is clearly outlined. She works closely with neurosurgeons and medical oncologists to decide when SRS is appropriate and how it fits into your overall cancer care plan, particularly in the setting of oligometastatic or limited metastatic disease.
The term advanced radiotherapy covers a range of modern techniques that allow radiation to be shaped and guided with great precision. These include 3D-CRT (three-dimensional conformal radiotherapy), IMRT (intensity-modulated radiotherapy), VMAT (volumetric modulated arc therapy), image-guided radiotherapy (IGRT), SBRT, and SRS, among others.
In her practice, Dr. Mathangi makes use of:
By tailoring these technologies to each individual case, she aims to maximise tumour control while minimising side effects, whether your treatment goal is cure, long-term control, or symptom relief.
TrueBeam STx is an advanced linear accelerator platform designed to deliver highly precise radiation treatments such as IMRT, VMAT, SBRT, and SRS. It combines powerful imaging, rapid dose delivery, and sophisticated motion-management tools in a single system, making it particularly useful for treating tumours that move with breathing, like those in the lung.
In lung cancer, TrueBeam STx enables:
Under Dr. Mathangi's supervision, the use of TrueBeam STx helps translate meticulous planning into safe, accurate daily treatments. For many patients, this means more confidence that the right dose is reaching the right place every day, with fewer interruptions to their routine.
Side effects depend on the dose, technique, and area being treated. Common short-term effects of lung radiation can include tiredness, mild skin darkening in the treatment area, sore throat or difficulty swallowing (if the oesophagus is in the field), and a temporary increase in cough or chest discomfort.
Less commonly, patients may experience radiation pneumonitis (inflammation of the lung) a few weeks to months after treatment, which can cause cough, low-grade fever, or breathlessness. Long-term changes such as lung scarring or mild reduction in lung capacity are possible but are carefully minimised during planning.
From the beginning, Dr. Mathangi focuses on prevention and early detection of side effects. She and her team provide guidance on nutrition, breathing exercises, skin care, and activity levels; prescribe medications like cough suppressants, inhalers, or steroids when needed; and schedule regular follow-up visits to monitor your recovery. You will be encouraged to report any new symptoms promptly so that they can be addressed early.
Personalisation starts with a detailed assessment of your medical history, lung function, imaging, pathology reports, and lifestyle. Based on this, Dr. Mathangi discusses all appropriate options with you, including whether you are best suited for conventional radiation, SBRT, combined chemoradiation, or short-course palliative treatment to relieve symptoms.
Your radiation plan is then created by integrating clinical information with advanced imaging and dose-planning tools. The goal is to deliver the most effective dose to the tumour while respecting safety limits for your normal organs, keeping in mind your age, co-existing illnesses, and personal priorities.
Throughout the process, from simulation to the last day of treatment and beyond, Dr. Mathangi emphasises clear communication. She explains each step in understandable language, keeps you informed about what to expect, and works with a multidisciplinary team to ensure that your radiation care is smoothly coordinated with surgery, medical oncology, and supportive care services as needed.
Your information is kept strictly confidential.
