Treasure Island Naval Station and Mesothelioma

Imagine a sailor reporting for duty on a man-made island in San Francisco Bay in 1965, assigned to routine maintenance work aboard ships docked for repair. Decades later, that same veteran receives a diagnosis of malignant pleural mesothelioma, a cancer almost exclusively caused by inhaling asbestos fibers. This scenario has played out for hundreds of veterans who served at Naval Station Treasure Island (NAVSTA Treasure Island), a U.S. Navy base that operated on an artificial island in San Francisco Bay from 1942 until its decommissioning in 1997.

Treasure Island Naval Station sits on a 403-acre man-made island constructed for the 1939 Golden Gate International Exposition and subsequently converted to military use during World War II. The base served as a major naval training and administrative hub for the Pacific Fleet, processing millions of sailors over its five-decade history. According to the U.S. Department of Veterans Affairs (VA), naval installations like Treasure Island routinely used asbestos in ship construction, repair facilities, barracks, and base infrastructure throughout the mid-20th century, creating significant and often unrecognized exposure risks for the men and women stationed there.

Asbestos was prized by the Navy for its heat resistance, durability, and fire-retardant properties. It was woven into pipe insulation, boiler lagging, gaskets, floor tiles, ceiling panels, and dozens of other shipboard and building materials. Veterans who worked in engine rooms, boiler rooms, or repair shops at Treasure Island could inhale microscopic asbestos fibers without any immediate symptoms, not realizing they were setting the stage for a disease that might not appear for 30 to 50 years. According to the National Cancer Institute (NCI), mesothelioma has a median latency period of approximately 40 years, which means many Treasure Island veterans are only now receiving diagnoses tied to service that ended decades ago.

The closure of the base in 1997 under the Base Realignment and Closure (BRAC) process did not end the health consequences for those who served there. Environmental assessments conducted after decommissioning identified multiple areas of contamination on the island, including asbestos-containing materials in aging structures. For veterans and their families navigating a mesothelioma diagnosis today, understanding the specific exposure history at Treasure Island is a critical first step toward accessing VA benefits, specialized medical care, and potential legal compensation.

Mesothelioma caused by asbestos exposure at Treasure Island Naval Station presents the same clinical picture as mesothelioma arising from any other source. The disease is notoriously difficult to detect early because symptoms don't appear until the tumor has grown large enough to affect surrounding structures, often 20 to 50 years after the original exposure. According to the American Cancer Society (ACS), the most common form, pleural mesothelioma, accounts for roughly 75 to 80 percent of all cases and originates in the lining of the lungs.

Veterans who served at Treasure Island should discuss their service history with a physician if they experience any of the following symptoms, particularly if those symptoms persist or worsen over weeks:

• Shortness of breath (dyspnea): Often the earliest and most prominent symptom, caused by fluid accumulation (pleural effusion) around the lung
• Chest pain or tightness: Typically described as a dull, persistent ache on one side of the chest
• Persistent dry cough: May be mistaken for a respiratory infection or chronic bronchitis
• Unexplained weight loss and fatigue: Common to many cancers, these systemic symptoms often accompany advanced disease
• Hoarseness or difficulty swallowing: Suggests tumor involvement near the esophagus or laryngeal nerve

For veterans with peritoneal mesothelioma, which affects the abdominal lining, symptoms shift toward abdominal swelling, pain, nausea, and changes in bowel habits. The Mayo Clinic notes that because these symptoms overlap with far more common conditions, mesothelioma is frequently misdiagnosed as pneumonia, heart failure, or irritable bowel syndrome, delaying accurate diagnosis by months or longer. If you served at Treasure Island and have any respiratory or abdominal complaints, telling your doctor about your naval service history is not optional. It's essential.

The causal link between Treasure Island Naval Station and mesothelioma runs directly through the Navy's extensive use of asbestos-containing materials (ACMs) throughout the 20th century. The U.S. Navy was one of the largest institutional users of asbestos in American history, incorporating the mineral into virtually every class of vessel and shore installation from the 1930s through the late 1970s. Treasure Island, as both a training facility and a ship repair and processing center, concentrated multiple high-risk exposure pathways in a single location.

According to a 2017 review published in the International Journal of Environmental Research and Public Health, occupational asbestos exposure in naval settings occurred through several distinct mechanisms. Shipyard and repair work generated the highest fiber concentrations, as cutting, sanding, or removing insulation from pipes, boilers, and bulkheads released dense clouds of respirable fibers. Veterans who worked as machinists, pipefitters, boilermakers, electricians, or damage control specialists faced the most intense exposures. But secondary exposure was also common: sailors who simply lived and worked near ongoing repair operations could inhale fibers that drifted through poorly ventilated spaces.

On shore at Treasure Island, the base's buildings, barracks, administrative offices, and training facilities constructed before 1980 routinely incorporated asbestos in floor tiles, ceiling tiles, roofing materials, pipe insulation, and spray-applied fireproofing. Renovation and demolition work on aging structures was particularly hazardous, as disturbing intact ACMs releases fibers that would otherwise remain bound in place. The VA acknowledges that veterans stationed at shore installations like Treasure Island faced real asbestos risks outside of shipboard environments, and service records documenting time at the base can support a claim for service-connected disability.

Not every veteran who served at Treasure Island will develop mesothelioma, but certain factors meaningfully increase the risk. According to the NCI, the single most important determinant is the cumulative dose of asbestos inhaled over time, which depends on the intensity of exposure, its duration, and the type of asbestos fiber encountered. The Navy predominantly used chrysotile (white asbestos) and amphibole forms including amosite (brown asbestos) and crocidolite (blue asbestos). Amphibole fibers are considered more carcinogenic than chrysotile because their needle-like shape allows them to penetrate deep into lung tissue and persist there for decades.

Veterans in the following occupational specialties at Treasure Island or aboard vessels processed through the station carried the highest risk profiles:

• Boilermakers and pipefitters: Worked directly with heavily insulated systems where asbestos was applied thickly to prevent heat loss
• Machinist's mates and enginemen: Operated in engine rooms and machinery spaces where asbestos gaskets, packing, and insulation were ubiquitous
• Hull maintenance technicians: Performed repair and renovation work that disturbed ACMs in ship structures and shore buildings
• Electricians and electronics technicians: Handled asbestos-insulated wiring and worked in electrical panels lined with asbestos board
• Construction battalion (Seabee) personnel: Built and maintained base infrastructure using asbestos-containing construction materials

Beyond occupational role, smoking history compounds risk significantly. A landmark 1980 study by Hammond and colleagues, published in the Annals of the New York Academy of Sciences, found that asbestos-exposed workers who smoked had a lung cancer risk roughly 50 times higher than non-exposed, non-smoking controls. While smoking does not directly cause mesothelioma, it accelerates other asbestos-related lung diseases and complicates the clinical picture. Age at first exposure also matters: veterans who began service in their late teens or early 20s and experienced prolonged exposure have had more time for the disease to develop.

A Treasure Island veteran presenting with unexplained shortness of breath or chest pain will typically begin a diagnostic workup that mirrors the standard pathway for any suspected thoracic malignancy. The key difference is that a thorough occupational and military history, specifically documenting service at asbestos-heavy installations like Treasure Island, should immediately raise the physician's index of suspicion for mesothelioma rather than more common diagnoses.

The diagnostic process generally unfolds in stages. Imaging comes first: a chest X-ray may reveal pleural effusion or pleural thickening, but a computed tomography (CT) scan provides far greater detail about tumor location, size, and extent. According to the American College of Radiology, CT imaging with contrast is the preferred initial modality for evaluating suspected pleural disease. Positron emission tomography (PET) scans are increasingly used to assess metabolic activity and detect distant metastases.

Imaging alone cannot confirm mesothelioma. A tissue biopsy is required for definitive diagnosis. The most common approach is a thoracoscopic (VATS) biopsy, in which a surgeon inserts a camera and instruments through small chest incisions to obtain pleural tissue samples. Pathologists then analyze the samples using immunohistochemistry, a technique that identifies specific protein markers to distinguish mesothelioma from lung adenocarcinoma, metastatic disease, or benign pleural conditions. According to a 2018 consensus statement from the International Mesothelioma Interest Group (IMIG), a panel of at least two positive mesothelial markers and two negative carcinoma markers is required for a confident mesothelioma diagnosis.

Veterans pursuing a VA disability claim should request copies of all diagnostic records, including pathology reports, imaging studies, and operative notes. The VA requires a nexus letter from a physician linking the diagnosis to in-service asbestos exposure, and documentation of service at Treasure Island, combined with a confirmed mesothelioma diagnosis, generally satisfies this requirement.

Mesothelioma staging determines how far the cancer has spread and directly guides treatment decisions and prognosis. The most widely used system for pleural mesothelioma is the TNM staging system, updated by the American Joint Committee on Cancer (AJCC) in its 8th edition (2017), which classifies tumors based on primary tumor extent (T), lymph node involvement (N), and distant metastasis (M).

In practical terms, Stage I disease is confined to one side of the chest with no lymph node involvement, while Stage IV disease has spread to distant organs or the opposite chest cavity. According to the NCI, most mesothelioma patients are diagnosed at Stage III or IV because the disease produces few symptoms in its early stages. Veterans who receive a diagnosis at Stage I or II have meaningfully better surgical options and longer median survival times, which is one reason why early disclosure of asbestos exposure history to a physician can be life-altering. Catching the disease before it spreads widely opens the door to potentially curative surgery combined with chemotherapy and radiation.

Treatment for mesothelioma in Treasure Island veterans follows the same evidence-based protocols used for all mesothelioma patients, though the veteran's age, overall health, lung function, and disease stage all influence which options are feasible. According to the NCI, the standard first-line chemotherapy regimen for unresectable pleural mesothelioma is the combination of pemetrexed (Alimta) and cisplatin, which was approved by the U.S. Food and Drug Administration (FDA) in 2004 based on a phase III trial published in the Journal of Clinical Oncology by Vogelzang and colleagues. That trial demonstrated a median survival of 12.1 months with the combination versus 9.3 months with cisplatin alone.

For patients with early-stage disease and adequate cardiopulmonary reserve, surgery offers the most aggressive treatment option. Two primary surgical approaches exist: extrapleural pneumonectomy (EPP), which removes the affected lung, pleura, pericardium, and diaphragm, and pleurectomy/decortication (P/D), which preserves the lung while stripping away the diseased pleural lining. A 2016 systematic review in the Journal of Thoracic and Cardiovascular Surgery by Cao and colleagues found that P/D was associated with lower perioperative mortality than EPP while achieving comparable survival in selected patients.

Immunotherapy has emerged as a significant development in mesothelioma treatment. In 2020, the FDA approved the combination of nivolumab (Opdivo) and ipilimumab (Yervoy) for first-line treatment of unresectable pleural mesothelioma, based on the CheckMate 743 trial published in The Lancet in 2021. That trial, led by Dr. Paul Baas and colleagues, showed a median overall survival of 18.1 months with the immunotherapy combination versus 14.1 months with standard chemotherapy. Veterans treated at VA medical centers with specialized oncology programs may have access to these newer regimens, and several VA facilities have formal mesothelioma treatment programs.

Radiation therapy, while not curative for mesothelioma, plays an important palliative role in controlling pain and preventing tumor seeding along biopsy or surgical tracts. Intensity-modulated radiation therapy (IMRT) allows precise targeting that minimizes damage to surrounding healthy tissue.

The prognosis for mesothelioma remains serious, but it's not uniform. Survival depends heavily on histologic subtype, stage at diagnosis, and access to specialized treatment. According to the NCI's Surveillance, Epidemiology, and End Results (SEER) database, the five-year relative survival rate for pleural mesothelioma is approximately 12 percent across all stages combined, a figure that reflects the high proportion of patients diagnosed at advanced stages.

Histologic subtype is one of the strongest prognostic factors. The epithelioid subtype, which accounts for roughly 50 to 70 percent of cases, carries the most favorable prognosis, with median survival often exceeding 18 months with treatment. Sarcomatoid mesothelioma, by contrast, is associated with median survival of 6 months or less and responds poorly to most therapies. Biphasic tumors, containing both cell types, fall between these extremes depending on the proportion of each component.

Veterans diagnosed at Stage I or II who are candidates for aggressive multimodal therapy (surgery plus chemotherapy plus radiation) have reported median survivals of 20 to 30 months in specialized center series, with some long-term survivors documented beyond five years. Age, performance status, and the absence of significant comorbidities all favor better outcomes. The key message for Treasure Island veterans is that a mesothelioma diagnosis, while serious, does not preclude meaningful treatment and extended survival, particularly when care is sought at a center with dedicated mesothelioma expertise.

Receiving a mesothelioma diagnosis after service at Treasure Island Naval Station can feel isolating, but you're not navigating this alone. The VA operates a network of specialty care programs for veterans with asbestos-related diseases, and the Mesothelioma Applied Research Foundation (MARF) maintains a directory of specialized treatment centers across the country. Connecting with a mesothelioma specialist, rather than a general oncologist, can make a tangible difference in treatment planning and access to clinical trials.

On the legal and financial side, veterans diagnosed with service-connected mesothelioma may pursue multiple avenues simultaneously. VA disability compensation provides monthly payments based on disability rating and does not preclude filing a civil lawsuit or asbestos trust fund claim against the manufacturers of the asbestos-containing products used at Treasure Island. According to the RAND Corporation's 2005 report on asbestos litigation, more than 60 asbestos trust funds had been established by bankrupt asbestos companies, collectively holding tens of billions of dollars for claimants. An attorney specializing in asbestos litigation can help identify which trusts apply to a specific veteran's exposure history.

Palliative care is an important and underutilized resource for mesothelioma patients at any stage of disease. A 2010 landmark trial published in the New England Journal of Medicine by Temel and colleagues demonstrated that early palliative care integration for patients with advanced lung cancer improved both quality of life and, notably, median survival by approximately 2.7 months compared to standard oncologic care alone. The same principles apply to mesothelioma. Palliative care teams address pain, breathlessness, fatigue, and emotional distress, and they work alongside your oncology team rather than replacing it.