Inclusion Criteria:

1. 18 years of age and older
2. Life expectancy of ≥ 3 months
3. Histological/cytological diagnosis of de novo adenocarcinoma of the pancreas
4. Unresectable, locally advanced stage disease according to the following criteria:

* Head/uncinate process:

1. Solid tumor contact with SMA\>180°
2. Solid tumor contact with the CA\>180°
3. Solid tumor contact with the first jejunal SMA branch
4. Unreconstructible SMV/PV due to tumor involvement or occlusion (can be d/t tumor or bland thrombus)
5. Contact with most proximal draining jejunal branch into SMV
* Body and tail

1. Solid tumor contact of \>180° with the SMA or CA
2. Solid tumor contact with the CA and aortic involvement
3. Unreconstructible SMV/PV due to tumor involvement or occlusion (can be d/t tumor or bland thrombus)
* No distant metastasis, including non-regional lymph node metastasis
* No borderline resectable (per Al-Hawary MM, et al., Radiology 201414)
5. ECOG score 0-2
6. Amenable and assigned by the investigator to receive therapy with gemcitabine and nab-paclitaxel
7. Able to operate the NovoTTF-200T System independently or with the help of a caregiver
8. Signed informed consent form for the study protocol

Exclusion Criteria:

1. Prior palliative treatment (e.g. surgery, radiation) to the tumor
2. Cancer requiring anti-tumor treatment within the 5 years before inclusion, excluding treated stage I prostate cancer, in situ cervical or uterus cancer, in situ breast cancer and non-melanomatous skin cancer.
3. Serious co-morbidities:

1. Clinically significant (as determined by the investigator) hematological, hepatic and renal dysfunction, defined as: Neutrophil count \< 1.5 x 10\^9/L and platelet count \< 100 x 10\^9/L; bilirubin \> 1.5 x Upper Limit of Normal (ULN); AST and/or ALT \> 2.5 x ULN; and serum creatinine \> 1.5 x ULN.
2. History of significant cardiovascular disease unless the disease is well controlled. Significant cardiac disease includes second/third degree heart block; significant ischemic heart disease; poorly controlled hypertension; congestive heart failure of the New York Heart Association (NYHA) Class II or worse (slight limitation of physical activity; comfortable at rest, but ordinary activity results in fatigue, palpitation or dyspnea).
3. History of arrhythmia that is symptomatic or requires treatment. Patients with atrial fibrillation or flutter controlled by medication are not excluded from participation in the trial.
4. History of cerebrovascular accident (CVA) within 6 months prior to randomization or that is not stable.
5. Active infection or serious underlying medical condition that would impair the ability of the patient to receive protocol therapy.
6. History of any psychiatric condition that might impair patient's ability to understand or comply with the requirements of the study or to provide consent.
4. Concurrent anti-tumor therapy beyond gemcitabine and nab-paclitaxel
5. Implantable electronic medical devices in the torso, such as pacemakers
6. Known severe hypersensitivities to medical adhesives or hydrogel, or to one of the chemotherapies used in this trial.
7. Pregnancy or breast-feeding (female patients with reproductive potential and their partners must accept to use effective contraception throughout the entire study period and for 3 months after the end of treatment). All patients who are capable of becoming pregnant must take a pregnancy test which is negative within 72 hours before beginning treatment. The definition of effective contraception is left up to the decision of the investigator.
8. Unable to follow the protocol for medical, psychological, familial, geographic or other reasons.
9. Admitted to an institution by administrative or court order.